Power Generation Technology MCQ (PGT)


1. The alternator is used in power plants which converts.......
A.Electrical Energy into Mechanical Energy
B.Electrical energy into Solar Energy
C.Mechanical Energy into Electrical Energy
D.Mechanical Energy into Nuclear Energy

Ans-C. Mechanical Energy into Electrical 
Energy

2. In regenerative cycle feed water is heated by........
A. Exhaust gas
B. Heaters
C. Draining steam from the turbine
D. All of the above

Ans-C. Draining steam from the turbine

3. The Da-Lavel impulse turbine is a........
A. Velocity compounded impulse turbine
B. Simple single wheel impulse turbine
C. Pressure componded impulse turbine
D. Simple single wheel reaction turbine

Ans-B.Simple single wheel impulse turbine

4. In a power station 'Load Center' means........
A.Center of maximum load of equipments
B.Center of coal fields
C.Center of gravity of electrical system
D.Corner of power plant

Ans-C.Center of gravity of electrical system

5. The efficiency of chimney is approximately........
A.20%
B.90%
C.10%
D.65%
Ans-A.20%

6. Surge tank is for the protection of.......
A.Dam
B.Spillways
C.Penstock
D.Headworks
Ans-C

7. The pressure at the furnaceis minimum in case of........
A.forced draught system
B.induced draught system
C.Balanced draught system
D.Natural draught system
Ans-C.Balanced draught system

8. For forced draught system,the function of chimney is mainly........
A.To produce draught to accelerate the combustion of fuel
B.To discharge gases high up in the atmosphere to avoid hazard
C.To reduce the temperature of the hot gases discharged
D.None of the above
Ans-A.To produce draught to accelerate the combustion of fuel

9. Binary vapour cycles are used to........
A.Increase the performance of the condenser
B.Increase the efficiency of the plant
C.Increase the efficiency of the plant
D.None of the above
Ans-B.Increase the efficiency of the plant

10. Minimum quantity of fuel is required........
A.Thermal power plant
B.Nuclear power plant
C.Hydro electric power plant
D.Diesel power plant
Ans-B.Nuclear power plant

11. The draught which a chimney produces is called.......
A.Induced draught
B.Natural draught
C.Forced draught
D.Balanced draught
Ans-B.Natural draught

12. The main source of production of biogas is........
A.Human waste
B.Wet cow dung
C.Wet livestock waste
D.all of the above
Ans-D.All of the above

13. The secondary sources of energy are........
A.Coal,oil,uranium
B.Wood,animal waste,agricultuer waste
C.Wind,biomass,geothermal
D.Solar,wind,water
Ans-D.Solar,wind,water

14. The primary sources of energy are........
A.Coal,oil,uranium
B.Solar,wind,water
C.hydrogen,oxygen,water
D.Wind,biomass,geothermal
Ans-A.Coal,oil,uranium

15. In fuel cell,chemical energy is converted into........
A.Heat energy
A.Electrical energy
C.Mechanical energy
D.None of the above
Ans-B.Electrical energy

16. The commercial souce of energy.......
A.Fossil fuels,hydropower,nuclear power
B.Wood,animal waste,agriculture waste
C. Solar,wind,biomass
D.None fo the above
Ans-A.Fossil fuels,hydropower,nuclear power

17. The non-commercial sources of energy are........
A.Solar,wind,biomass
B.Wood,animal waste,agriculture waste
C.Fossil fuels,hydropower,nuclear power
D.None of the above
Ans-B.Wood,animal waste,agriculture waste

18. The modern steam turbines are........
A.Impulse turbine
B.Reaction turbine
C.Impulse-reaction turbine
D.None of the above
Ans-C.Impulse-reaction turbine

19. The draught which a chimney produces is called........
A.Induced draught
B.Forced draught
C.Natural draught
D.Balanced draught
Ans-C.Natural draught

20. Fan is located in induced draught........
A.Near bottom of furnace
A.Near bottom of chimney
C.At the of chimney
D.Anywhere
Ans-B.Near bottom of chimney

21. Economiser is used to heat.......
A.Feed heater
B.Air
C. Flue gases
D.All of the above
Ans-A.Feed water

22. Space required of a steam power station........
A.More than diesel power station
B.Equal to diesel power station
C.Less than diesel power station
D.None of the above
Ans-A.More than diesel power station

23. Artificial draught is produced by........
A.Forced fan
B.Induced fan
C.Induced and forced fan
D.All of the above
Ans-D.All of the above

24. The draught in locomotive boilers is produced by........
A.Forced fan
B.Chimney
C.Steam jet
D.Only locomotive motion
Ans-C.Steam jet

25. Artifical draught nomally designed to produce ........
A.Less smoke
A.More draught
C.Less chimney gas temperature
D.All of the above
Ans-D.All of the above

26. The pressure at the furnace is minimum in case of.......
A.Forced draught system
B.Induced draught system
C.Balanced draught system
D.Natural draught system
Ans-C.Balanced draught system

27. Economiser is used to........
A.Heat air
B.Heat feed water
C.Heat flue gases
D.All of the above
Ans-B.heat feed water

28. Critical pressure ratio of a convergent nozzle is defined as........
A.The ratio of inlet presssure to outlet pressure of nozzle
B.The ratio of outlet presssure to inlet pressure of nozzle
C.The ratio of outlet pressure to inlet pressure only when mass flow rate per unit 
area is minimumn
D.The ratio of outlet pressure to inlet pressure only when mass flow rate per unit 
area is maximumn
Ans-D.The ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is maximum

29. The value of reheat factor is ........
A.0.5% to 0.6%
B.1.02% to 1.06%
C.0.9% to 0.95%
D.1.2% to 1.6%
Ans-B.1.02% to 1.06%

30. Economoser improves boiler efficiency........
A.4% to 5%
A.1% to 5%
C.10% to 12%
D.18% to 20%
Ans-A.4% to 5%

31. Pipes carrying steam are generally made up of.......
A.Cast iron
B.Steel
C.Copper
D.Aluminium
Ans-C

32. Belt conveyer can be used to transport coal at inclinations upto........
A.60°
B.30°
C.90°
D.80°
Ans-B.30°

33. The maximum length of a screw conveyer is about........
A.40 meters
B.30 meters
C.60 meters
D.100 meters
Ans-B.30 meters

34. Load center in a power station is........
A.Center of coal fields
B.Center of maximum load of equipments
C.Center of gravity of electrical system
D.None of the above
Ans-C.Center of gravity of electrical system

35. Evaporative type of condenser has........
A.Steam in pipes surrounded by water
A.Water in pipes surrounded by steam
C.either a or b
D.Both a and b
Ans-A.Steam in pipes surrounded by water

36. Pulverised fuel is used for.......
A.Better burning
B.Saving fuel
C.Obtaining fuel
D.For economy
Ans-A.Better burning

37. Combustible elements in the fuel are........
A.Carbon,hydrogen,sulphur
B.Carbon,hydrogen,nitrogen
C.Carbon,hydrogen,ash
D.Carbon,hydrogen
Ans- A. Carbon,hydrogen,sulphur

38. Heating value of diesel oil is about........
A.5000 kcal/kg
B.7000 kcal/kg
C.9000 kcal/kg
D.11000 kcal/kg
Ans-D.11000 kcal/kg

39. Caking coals are those which........
A.Burn completely
B.Burn freely
C.Do not foam ash
D.Form lumps or masses of coak
Ans-D.Form lumps or masses of coak

40. Primary air is that air which is used to ........
A.Reduced the flame lenght
A.Increase the flame length
C.transport and dry the coal
D.none of the above
Ans-C.transport and dry the coal

41. The thermal efficiency of a steam power station is.......
A.38%
B.28%
C.40%
D.45%
Ans-B.28%

42. Rankine cycle efficiency in a good steam power station may be in the range 
between........
A.15% - 20%
B.35% - 40%
C.50% - 60%
D.90% - 95%
Ans-B.35% - 40%

43. A steam power station requires space........
A.Equal to diesel power station
B.More than diesel power station
C.More than diesel power station
D.None of the above
Ans-B.More than diesel power station

44. The height of chimney in a staem power plant is governed by........
A.Flue gases quantity
B.The draught to be produced
C.Control of pollution
D.Corner of power plant
Ans-B.The draught to be produced

45. The major heat loss in a staem power station occurs in ........
A.Heat chember
B.Penstock
C.Spillways
D.Condenser
Ans-D.Condenser

46. The major heat loss in a steam power station occurs in.......
A.Economiser
B.Spillways
C.Condenser
D.None of the above
Ans-C.Condenser

47. The cost of fuel transportation is 
maxmimun in........
A.Hydro-electric power plant
B.Steam power plant
C.Nuclear power plant
D.90% - 95%
Ans-B.Steam power plant

48. Which of the following station is least efficient........
A.Nuclear power plant
B.Diesel power station
C.Thermal power station
D.None of the above
Ans-C.Thermal power station

49. ........requires more space
A.Nuclear power plant
B.Hydro-electric power plant
C.Tharmal power plant
D.Diesel power plant
Ans-C.Tharmal power plant

50. Standby loss is maximum in........
A.Nuclear power plant
B.Hydro-electric power plant
C.Tharmal power plant
D.Diesel power plant
Ans-C.Tharmal power plant

51. Francis,kaplan and propeller turbines fall under the category of.......
A.Impulse turbine
B.Reaction turbine
C.Impulse reaction combined
D.Axial flow
Ans-B.Reaction turbine

52. In reaction turbine,function of the draft tube is........
A.To increase the flow rate
B.To reduce water hammer effect
C.To convert kinetic energy of water to potential energyby a gradual expansion in 
divergen part
D.None of the above
Ans-B.To reduce water hammer effect

53. Pelton turbine is suitable for high head and........
A.High discharge
B.Low discharge
C.High and low discharge
D.None of the above
Ans-B.Low discharge

54. Francis turbine is usually used for........
A.High head
B.Low head
C.Mediam head
D.All of the above
Ans-C.Mediam head

55. Pelton wheel turbine is used for minimum of the following heads........
A.20 m
B.40 m
C.120 m
D.180 m and above
Ans-D.180m and above

NUCLEAR POWER PLANT
1. The first nuclear power plant in the world was commissioned in.......
A.U.S.A.
B.U.S.S.R
C.England
D.None of the above
Ans-B.U.S.S.R in 1954

2. In all plant minimum quality of fuel is required in........
A.Thermal power plant
B.Hydro electric power plant
C.Nuclear power plant
D.Gas turbine plant
Ans-C.Nuclear power plant
3. The avarage thermal efficiency of modern nuclear power plant is about........
A.30%
B.60%
C.40%
D.80%
Ans-A.30%

4. Reflectors of a nuclear reactors are made of........
A.Boron
B.Cast iron
C.Beryllium
D.Steel
Ans-C.Beryllium

5. The nuclear energy is measured as........
A.MeV
B.MW
C.Curie
D.None of the above
Ans-A.MeV

6. In the nuclear fission reactions......isotope of uranium is used
A.U238
B.U235
C.U233
D.None of the above
Ans-C.U233

7. The conversion ratio of a breeder reactor is........
A.Equal to unity
B.More than unity
C.Leass than unity
D.None of the above
Ans-B.More than unity

8. ......is the most commonly used moderator
A.Graphite
B.Sodium
C.Deuterium
D.Heavy water
Ans-A.Graphite

9. The function of the moderator in a nuclear is to........
A.Stop chain reaction
B.Absorb neutrons
C.Reduce the speed of neutrons
D.Reduce temperature
Ans-C.Reduce the speed of neutrons

10. Fast breed reactors are best suited for........
A.Of large thorium deposits
B.Of large uranium deposits
C.Of large plutonium deposits
D.None of the above
Ans-A.Of large thorium deposits

11. The function of a moderator in a nuclear reactor is......
A.To slow down the fast moving electrons
B.To speed up the slow moving electron
C.To start the chain reaction
D.To transfer heat produced inside the reactor to a heat exchanger
Ans-A.To slow down the fast moving electrons

12. When nuclear reactor is operating at constant power the multiplication factor 
is........
A.Equal to unity
B.More than unity
C.Leass than unity
D.None of the above
Ans-B.Equal to unity

13. In a nuclear reactor function of reflector is to......
A.Reduce the speed of the neutrons
B.Stop the chain reaction
C.Reflect the escaping neutrons back into the core
D.None of the above
Ans-C.Reflect the escaping neutrons back into the core

14. In a gas cooled reactor(GCR).......is used as moderator and coolant respectively
A.Heavy water and CO2
B.Graphite and CO2
C.Graphite and air
D.None of the above
Ans-B.Graphite and CO2

15. In a pressuried water reactor (PWR)........
A.The coolant water is pressurised to work as moderator
B.The coolant water boils in the core of the reactor
C.The coolant water is pressurised to prevent boiling of water in the core
D.None of the above

Ans-C.The coolant water is pressurised to prevent boiling of water in the core

GAS turbine power plant

1. Gas turbine power plant is.......efficient than steam turbine plant
A.More
B.Less
C.Same
D.None of the above
Ans-A.More

2. Maximum combustion pressure in a gas turbine is........as compared to diesel engine
A.Same
B.Less
C.More
D.None of the above
Ans-B.Less

3. Capital cost of a gas turbine plant........than that of a steam power plant of same 
capacity
A.Same
B.Lower
C.Higher
D.None of the above
Ans-B.Lower

4. In a gas turbine plant,a regenerator increases........
A.Work output
B.Pressure ratio
C.Thermal efficiency
D.All of the above
Ans-C.Thermal efficiency

5. In a gas turbine,high thermal efficiency is obtained in........
A.Closed cycle
B.Open cycle
C.In both the cycles
D.All the above cycles
Ans-A.Closed cycle

6. Thermal efficiency of a gas turbine power plant as compared to diesel engine plant 
is
A.Higher
B.Lower
C.Same
D.May be higher or lower
✔ View Answer
Ans-B.Lower

7. Thermal efficiency of a closed cycle gas turbine plant increases by........
A.Reheating
B.Intercooling
C.Regenerator
D.All of the above
✔ View Answer
D.All of the above
8. Maximum temperature of a gas turbine plant is of the order of........
A.700°
B.900°
C.2100°
D.2500°
✔ View Answer
A.700°

9. The blades of the gas turbine rotor are made of........
A.Carbon steel
B.Stainless steel
C.High alloy steel
D.High nickel alloy
✔ View Answer
D.High nickel alloy

10. The thermal efficiency of a gas turbine with ideal regenerative heat exchanger 
is........
A.Equal to work ratio
B.Less than work ratio
C.More than work ratio
D.Um-predictable
✔ View Answer
A.Equal to work ratio

11. Mechanical efficiency of a gas turbine as compared to internal combustion 
reciprocating engine is....
A.Higher
B.Lower
C.Same
D.Un-predictable
✔ View Answer
A.Higher

12. For a gas turbine the pressure ratio in the range of........
A.2 to 3
B.3 to 5
C.16 to 18
D.18 to 22
✔ View Answer
B.3 to 5

13. In a two stage gas turbine plant,reheating after first stage........
A.Decrease the thermal efficiency
B.Increase the thermal efficiency
C.Does not effect the thermal efficiency
D.None of the above
✔ View Answer
A.Decrease the thermal efficiency7000

14. In a two stage gas turbine plant, reheating after first stage........
A.Increases work ratio
B.Decreases work ratio
C.Does not effect work ratio
D.None of the above
✔ View Answer
A.Increases work ratio

15. In a two stage gas turbine plant,with intercooling and reheating........
A.Both work ratio and thermal efficiency improve
B.Work ratio improves but thermal efficiency decreases
C.Thermal efficiency improves but work ratio decreases
D.Both work ratio and thermal efficiency decreases
✔ View Answer
B.Work ratio improves but thermal efficiency decreases

Hydro power plant

1. In a hydro-electric plant,spillways are used.......
A.To discharge all surplus water
B.To discharge surplus water on the downstream side of dam
C.Water is not not available in sufficient quantity
D.None of the above
✔ View Answer
B.To discharge surplus water on the downstream side of dam
2. The running cost of hydro-electric power plant is........paise per unit
A.10
B.8
C.5
D.15
✔ View Answer
C.5
3. Francis and kaplan turbine is used for........heads hydro-electric plant.
A.Medium and low head
B.High head
C.Low head
D.Low and high head
✔ View Answer
A.Medium and low head
4. For high head hydro-electric plants,the turbine used is........
A.Pelton wheel
B.Francis
C.Kaplan
D.All of the above
✔ View Answer
A.Pelton wheel
5. The cost of fuel transportation is minimum........
A.Thermal power plant
B.Hydro-electric power plant
C.Nuclear power plant
D.None of the above
✔ View Answer
B.Hydro-electric power plant
6. The cheapest plant in operation and maintenance is.......
A.Staem power plant
B.Nuclear power palnt
C.Hydro-electric power plant
D.None of the above
✔ View Answer
C.Hydro-electric power plant
7. The most simple and keen plant is........
A.Nuclear power plant
B.Steam power plant
C.Hydro-electric power palnt
D.None of the above
✔ View Answer
C.Hydro-electric power palnt
8. Pelton turbines are mostly........
A.Horizontal
B.Vertical
C.Inclined
D.None of the above
✔ View Answer
A.Horizontal
9. The annual depriciation of a hydro power plant is about........
A.0.5% to 1.5%
B.10% to 15%
C.15% to 20%
D.20% to 25%
✔ View Answer
A.0.5% to 1.5%
10. The power output from a hydro-electric power plant depends on three 
parameters........
A.Head,type and dam of discharge
B.Head,discharge and efficiency of the system
C.Efficiency of the system,type of draft tube and type of turbine used
D.Type of dam,discharge and type of catchment area
✔ View Answer
B.Head,discharge and efficiency of the system
11. The cheapest plant in operation and maintenance is.......
A.Staem power plant
B.Nuclear power palnt
C.Hydro-electric power plant
D.None of the above
✔ View Answer
12. Running cost of a hydro-electric power plant is.......
A.Equal to running cost of a steam power plant
B.Less than running cost of a steam power plant
C.More than running cost of a steam power plant
D.None of the above
✔ View Answer
13. Location of the surge tank in a hydro-electric station is near to the........
A.Tailrace
B.Turbine
C.Reservoir
D.None of the above
✔ View Answer
B.Reservoir
14. Pelton wheel turbine is used for minimumof the following heads........
A.40 m
B.120 m
C.150 m
D.180 m or above
✔ View Answer
D.180 m or above
15. In high head hydro power plant the velocity of water in penstock is about........
A.1 m/s
B.4 m/s
C.7 m/s
D.12 m/s
✔ View Answer
C.7 m/s
16. Francis,kaplan and propeller turbines fall under the category of.......
A.Impulse turbine
B.Reaction turbine
C.Impulse reaction combined
D.Axial flow
✔ View Answer
B.Reaction turbine
17. In francis turbine runner,the number of blades is generally of the order of........
A.1-2
B.4-6
C.6-8
D.12-16
✔ View Answer
D.12-16
18. Francis turbine is usually used for........
A.Low head installation upto 30 m
B.Medium head installation from 30 m to 180 m
C.High head installation above 180 m
D.For all heads
✔ View Answer
B.Medium head installation from 30 m to 180 m
19. Gross head of a hydro power station is........
A.The difference of water level between the level in the storage and tail race
B.The height of the water level in the river where the storage is provided
C.The height of the water level in the river where the tail race is provided
D.None of the above
✔ View Answer
A.The difference of water level between the level in the storage and tail race
20. Operating charges are minimum in the case of.......for same power output
A.Gas turbine plant
B.Hydel plant
C.Thermal plant
C.Nuclear plant
✔ View Answer
B.Hydel plant

Wind and tidal power plant

Q1. The installed capacity of wind energy in India is about
a. 8000 MW
b. 1500 MW
c. 6000 MW
d. 4000 MW
ANSWER: a. 8000 MW
Q2. Tidal energy utilizes
a. Kinetic energy of water
b. Potential energy of water.
c. Both (a) and (b)
d. None of these.
ANSWER: b. Potential energy of water.
Q3. In a fuel cell, electrical energy is produced by
a. Reaction of hydrogen with oxygen
b. Thermionic action
c. Combustion of fuel in the absence of oxygen.
d. None of the above.
ANSWER: a. Reaction of hydrogen with oxygen
Q4. Thermal gradient in a geo thermal plant is given by
a. Heat flux * thermal conductivity
b. Heat flux / thermal conductivity
c. Thermal conductivity / heat flux
d. None of these
ANSWER: c. Thermal conductivity / heat flux
Q5. Tidal energy development needs
a. Huge capacity and long construction time.
b. Huge capacity and low construction time.
c. Low capacity and long construction time.
d. Low capacity and low construction time.
ANSWER: a. Huge capacity and long construction time.
Q1. What is a load curve?
a. A plot of load vs current.
b. A plot of load vs time.
c. A plot of load vs duration of time.
d. Total number of units generated vs time.
ANSWER: b. A plot of load vs time.
Q2. What does the area under the load curve represent?
a. System voltage.
b. Current.
c. Energy consumed.
d. Maximum demand.
Q3. What does the highest point on the daily load curve represents?
a. Peak load.
b. Maximum demand.
c. Both (a) & (d).
d. None of these.
ANSWER: b. Maximum demand.
Q4. Load curve of a generation is always
a. Positive slope.
b. Zero slope.
c. Negative slope.
d. Combination of (a), (b) and (c).
ANSWER: d. Combination of (a), (b) and (c).
Q5. If the daily load curve is divided by 24, what does this curve represent?
a. Average load for the day.
b. Connected load.
c. Maximum demand.
d. Demand factor.
ANSWER: a. Average load for the day.
Q6. What does a mass curve represent?
a. Average load.
b. The total energy consumed by the load upto a particular time in a day.
c. The number of hours for which a particular lasts during the day.
d. The variation of load during different hours of the day.
ANSWER: b. The total energy consumed by the load upto a particular time in a day.
Q7. The mass curve is plotted from which of the following curve?
a. Chronological curve.
b. Energy load curve.
c. Load duration curve.
d. Both (a) and (b).
ANSWER: c. Load duration curve.
Q1. What does a load duration curve represent?
a. The variation of load during different hours of the day.
b. Average load.
c. The number of hours for which a particular lasts during the day.
d. None of the above.
ANSWER: c. The number of hours for which a particular lasts during the day.
Q2. What is the shape of the load duration curve?
a. Rectangular shape.
b. Triangular shape.
c. Parabolic shape.
d. Free hand sketch.
ANSWER: a. Rectangular shape.
Q3. Maximum and Minimum loads on the load duration curve is represented on which 
respective side?
a. Left and Right.
b. Right and Left.
c. Randomly.
d. None of these.
ANSWER: a. Left and Right.
Q4. What does the chronological load curve indicate?
a. Variation in demand factor during 24 hours.
b. Variation of demand from instant to instant during 24 hour.
c. The total energy consumed upto different times of the day.
d. The total number of hours for which a particular load lasts during the day.
ANSWER: b. Variation of demand from instant to instant during 24 hour.
Q1. Modern steam plants works on which of the following cycles?
a. Carnot cycle
b. Rankine cycle
c. Otto cycle
d. Bell- Coleman cycle
ANSWER: b. Rankine cycle
Q2. What would be the most important factor under consideration for the site selection of a 
thermal plant?
a. Availability of fuel.
b. Availability of water.
c. Distance from the populated area.
d. Cost and the type of land.
ANSWER: b. Availability of water.

Coal and Ash Handling in Thermal Power Plant - MCQs with answers

Q1. The best coal suitable for the production of energy is_________________.
a. Lignite
b. Bituminous
c. Anthracite
d. Peat
ANSWER: c. Anthracite

Q2. Name the system that is mainly employed for the disposal of fly ash.
a. Pneumatic
b. Hydraulic
c. Both (a) & (b)
d. Steam jet system.
ANSWER: a. Pneumatic

Q3. What is the superior quality of coal called?
a. Anthracite
b. Coke
c. Bituminous
d. Peat

Q4. The coal with highest ash content is?
a. Lignite
b. Steam coal
c. Coking coal
d. Bituminous coal
ANSWER: a. Lignite

Q5. The major content of coal in India is ________________.
a. Dust
b. Ash
c. Fly ash
d. Cinder
ANSWER: b. Ash

Q6. On which factor does the calorific value of coal depend on?
a. Ash content.
b. Size of coal particles
c. Moisture content.
d. Volatile material.
ANSWER: a. Ash content.

Q7. The elements that are combustible in the fuel are
a. Carbon and hydrogen.
b. Carbon, hydrogen and ash.
c. Carbon, hydrogen and sulphur.
d. Carbon, nitrogen and ash.
ANSWER: c. Carbon, hydrogen and sulphur.

Q8. What is the percentage of ash content in Indian coal?
a. 5 %
b. 10 %
c. 20 %
d. 30 %
ANSWER: c. 20 %

Q9. Which of the following is the essential element for the combustion of fuel?
a. Oxygen
b. Correct fuel air ratio.
c. Proper ignition temperature.
d. All of these.
ANSWER: d. All of these.

Q10. What is pulverised coal?
a. Non smoking coal.
b. Coal free from ash.
c. Coal broken into fine particles.
d. Coal which burns for long time.
ANSWER: c. Coal broken into fine particles.

Q11. Why is pulverised coal used?
a. Better burning.
b. Increased calorific value of coal.
c. Medium size units.
d. Less radiation loss.
ANSWER: a. Better burning.

Q12. What is the important factor in fuel selection?
a. Cost of fuel.
b. Calorific value
c. Both (a) & (b).
d. None of these.
ANSWER: c. Both (a) & (b).

Q13. Ash handling system is mainly divided into________________ systems.
a. Mechanical handling
b. Pneumatic
c. Hydraulic
d. All of these
ANSWER: d. All of these

14. Water is supplied to a boiler
a. at atmospheric pressure
b. at slightly more than atmospheric pressure
c. at 100 cm/kg2
d. at more than the steam pressure on the boiler.

15. Which of the following enters the super heater of a boiler 
a. Cold water
b. Hot water
c. Wet steam
d. Super-heated steam.

16. Operating cost of steam power plant is,
a. Less than that of nuclear power plant
b. Less than that of diesel/ gas power plant
c. Less than that of hydro-electric power plant 
d. Is the same as that of nuclear power plant

7. A condenser in a thermal power plant condenses steam combing out of
a. Boiler
b. Super-heater
c. Economizer
d. Turbine 

8. Overall thermal efficiency of a steam power station is in the range
a. 18-24%
b. 30-40%
c. 44-62%
d. 68-79%.
9. Feed water heaters in steam power plant are used to
a. Heat feed water to boiler by hot flue gases
b. Heat feed water with the help of bled steam
c. To improve thermal efficiency
d. Both( b) and (c)
12. The device used to preheat water before admission to boiler by hot flue gases is-
a. Superheater 
b. Economizer
c. Feed water heater
d. Air preheater 
13. Impurities in feed water used in high pressure boiler causes
a. Corrosion
b. Foaming and priming
c. Scale formation
d. All of the above
10. A closed vessel in which steam is produced from water by combustion of fuel is called
a. Steam generator
b. Boiler
c. Either (a) or (b)
d. None of the above
11. A boiler in which hot gases flow in the tubes surrounded by water called,
a. Smoke tube boiler
b. Water tube boiler
c. Fire tube boiler
d. Both( b) and (c)
14. In boiler, the carry over of slugs of water into the piping because of dirty water is called 
the,
a. Foaming
b. Pitting
c. scaling
d. Beating
15. The advantage of reheating of stem in a turbine is that
a. It increases the efficiency of the turbine.
b. It reduces the wears on the blades.
c. It increases the work done through the turbine.
d. All of the above advantages.
14. In boiler, the carry over of slugs of water into the piping because of dirty water is called 
the,
a. Foaming
b. Pitting
c. scaling
d. Beating
15. The advantage of reheating of stem in a turbine is that
a. It increases the efficiency of the turbine.
b. It reduces the wears on the blades.
c. It increases the work done through the turbine.
d. All of the above advantages.
18. The artificial draught is usually designed to produce 
a. More draught.
b. Less smoke.
c. Low temperature of chimney gas.
d. All of the above
19. For the same power, the size of a turbine 
a. Increase with speed.
b. Remains with speed.
c. Decrease with speed.
d. All of the above
20. The modern steam turbines are
a. Reaction turbines. 
b. Impulse turbines.
c. Impulse reaction turbines.
d. None of the above.
e. 1)-b 2)-b 3)- b 4)-a
f. 5)-c 6)-b 7)-d 8)-a
g. 9)-d 10)-c 11)-d 12)-b
h. 13)-d 14)-a 15)-d 16)-a
i. 17)-d 18)-d 19)-c 20)-c
1. Most commonly used moderator in nuclear plants is
a. Heavy water
b. Concrete and bricks
c. Deuterium
d. Graphite
2. Which of the following nuclear reactor does not need a heat exchanger for generation of 
steam
a. Gas cooled reactor
b. Pressurised water reactor
c. Boiling water reactor
d. Liquid metal cooled reactor
1. Most commonly used moderator in nuclear plants is
a. Heavy water
b. Concrete and bricks
c. Deuterium
d. Graphite
2. Which of the following nuclear reactor does not need a heat exchanger for generation of 
steam
a. Gas cooled reactor
b. Pressurised water reactor
c. Boiling water reactor
d. Liquid metal cooled reactor
1. Most commonly used moderator in nuclear plants is
a. Heavy water
b. Concrete and bricks
c. Deuterium
d. Graphite
2. Which of the following nuclear reactor does not need a heat exchanger for generation of 
steam
a. Gas cooled reactor
b. Pressurised water reactor
c. Boiling water reactor
d. Liquid metal cooled reactor
3. The function of control rod in nuclear plants is to
a. Control temperature
b. Control radioactive pollution
c. Control absorption of neutron
d. Control fuel consumption
4. In the nuclear fission reaction, isotope of uranium used is
a. U234
b. U235
c. U233
d. U238
5. The efficiency of a nuclear power plant in comparison to a conventional thermal power 
plant is
a. Same 
b. More
c. Less
d. May be less or depending on size
6. Moderator in nuclear plants is used to
a. Reduce temperature
b. Extract heat from nuclear reaction
c. Control of reaction
d. Moderate the radioactive pollution
7. Which material is used in controlling chain reaction in a nuclear reactor ?
a. Thorium 
b. Heavy water
c. Boron
d. Beryllium
8. The first nuclear power plant installed in India is 
a. Kota
b. Tarapur 
c. Kalpakkam 
d. Narora 
9. When diesel power plants are used to supply part loads whenever needed are called
a. Central power stations
b. Peak load plants
c. Stand by plants
d. Nursery stations
10. In ideal diesel cycle the working substance is
a. Air
b. Diesel
c. Mixture of air and diesel
d. Any combustible gas
11. Air filter is used in
a. Steam power plants
b. Nuclear power plants
c. Hydro power plants
d. Diesel power plants
12. Diesel plants used in combination with thermal and hydro power plants due to their 
inherent advantage of quick start and stop are called
a. Central power stations
b. Peak load plants
c. Stand by plants
d. Nursery stations
13. Diesel power plants used in remote areas due to non- availability of grid, such plants are 
called
a. Central power stations
b. Peak load plants
c. Stand by plants
d. Nursery stations
14. Which of the following statements is true?
a. Diesel power plant employ only four stroke engines.
b. Space requirement for diesel power plants in more than that for a conventional steam power plant.
c. A two stroke engine develops more power for the same speed and piston displacement. 
The specific fuel consumption of a diesel power plant decreases with the decrease
19. The main draw-backs of gas turbine power plants are
a. Low overall efficiency, noisy operation and limited unit capacity
b. Inability of using coal or heavy residual petroleum as fuels
c. High initial cost, poor reliability and large space requirements
d. Both (a) and (b) 
20. Gas turbine power plants are not widely used
a. As peak load plants
b. As standby power plants
c. As base load plants
d. In combination with steam power plants
15. Thermal efficiency of gas turbine improves because of
a. Reheating of gas after partial expansion.
b. Removing the heat from compressed air between the stages of compression.
c. Utilizing the heat of exhaust gases to heat the compressed air before it is sent to combustion 
chamber.
d. All of the above.
16. The comparison to diesel engines the gas engines have maximum combustion pressure
a. Less.
b. Same.
c. More.
d. Unpredictable
17. The gas turbine power plants mainly use
a. Coal and peat
b. Kerosene oil, diesel oil, residual oil
c. Gas oil
d. Natural gas and liquid petroleum fuels
18. In comparison to steam power plants, the gas power plants have
a. Low initial cost but higher operating cost
b. High initial cost but low operating cost
c. Both initial as well as operating costs high
d. Both initial as well as operating costs low
1)-d 2)-c 3)-c 4)-c
5)-c 6)-d 7)-c 8)-b
9)-c 10)-a 11)-d 12)-b
13)-d 14)-c 15)-d 16)-a 
17)-d 18)-a 19)-d 20)-c 
• 1. In a reaction turbine the enthalpy drop occurs in
• a. fixed blades only b. moving blade only
• c. both fixed and moving blades d. can not say
• 2. Governing of steam turbine is done to control
• a. speed b. fluctuation
• c.fluctuation speed within prescribed limits
• d. fluctuation speed within prescribed limits with variation of load
• 3. A Curtis turbine is an impulse turbine of the type 
• a. velocity compounded b. pressure compounded
• c. pressure-velocity compounded d. none of the above 
• 4. Which is not advantage of hydro power plant
• a. cost of generation is low b. high efficiency over wide range of loads c. does not require 
any fuel d. required high cost of transmission lines.
• 5. ------------is provided to prevent entry of debris into intakes from dam or from the forebay.
• a. gate b. Trash rack c. surge tank d. dam
• 6. Sudden rise of water pressure in Penstock is called 
• a. Surge b. water hammer c. water pressure
• 7. A channel which leads the water from turbine to the river is known as
• a. head race b. tail race c. penstock d. draft tube
• 8. A francies turbine works on the principle of 
• a. impulse b. reaction c. . impulse- reaction
• 9. In Kaplan turbine water enters the runner 
• a. radially b. axially c. Both a and b
• 10. Sudden pressure changes in pipe line of hydro power plant is caused
• a. due to sudden closure and opening of vales.
• b. due to closure of turbine gates during governing operation c. at the time of starting and 
stopping of turbine.
• d. all of the above.
• 11. State which type of turbine you would select for H=1000 m and Ns= 250
• a. Pelton b. Francis c. Kaplan d. none of above
• 12. Mechanical effinciency of Turbine is given by 
• a. Po/Pi b. Ps/Pi c. Pi/Po d. Po/Ps
• 13 Generatorleffinciency is given by 
• a. Po/Pi b. Ps/Pi c. Pi/Po d. Po/Ps
• 14. No. of blades used in francies turbine are
• a. 6 to 8 b. 14 to 30 c. 16 to 24. d. 20 to 35
• 15. Specific speed of francies turbine ranges from 
• a. 25 to 40 b. 50 to 100 c. 50 to 250
•
• 16 Outward radial flow turbines 
• (A) are impulses turbines 
• (B) are reaction turbines 
• (C) are partly impulse partly reaction turbines 
• (D) may be impulse or reaction turbines.
• Get Answer: d
• 17 . A Francis turbine is 
• (A) Inward flow reaction turbine 
• (B) Inward flow impulse turbine 
• (C) Outward flow reaction turbine 
• 18. Capital cost of hydro-power plaqnt is 
• a. low. b. high c. Medium
• 19. State which type of turbine you would select for H=14m and Ns= 330
• a. Pelton b. Francis c. Kaplan d. none of above.
• 20. . State which type of turbine you would select for H=400 m and Ns= 100
• a. Pelton b. Francis c. Kaplan 
• d. none of above.
• Answers 1)D 2)C 3)B 4)A 5)B 6)B 7)D 8)C 9)A
• 10)D 11)C 12)B 13)D 14)C 15)A 16)C
• 17)B 18)C 19)C 20)B