Power Generation Technology MCQ Part2 (PGT MCQ)



31) 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 comumed upto different times of the day
d. The total number of hours for which a particular load lasts during the day.

ANSWER: Variation of demand from Instant to instant during 24 hour.

32) What is a lead factor?

a.The ratio of average to maximum demand.
B.The ratio of maximum demand to average load.
C.The product of maximum demand and average load.
d. The ratio of average load to the plant capacity 
ANSWER: The ratio of average to maximum demand.

33) What is the load factor of a power plant?

a. Greater than unity

b. Less than unity 
C.Always more than unity

d. Normally more than unity

ANSWER: Less than unity

34) The load factor plays a key role in determining which among the following?

a Plant capacity

b. Overall cost per unit generated

c.Overall demand

d. Both (a) and (c)

ANSWER: Overall cost per unit generated

35) An industrial consumer has a load pattern of 2000 kW 0.8 lag for 12 hours and 1000 kW unity power factor for 12 hours. What is the load factor?

a 0.5

b. 0.55

c. 0.6 
d. 0.75

ANSWER: 0.75

36) What is the plant capacity factor?

a. A ratio of kWh generated to the product of plant capacity and the number of hours for which the plant is in operation.
 b. The ratio of sum of individual maximum demands to the maximum demand on power stations.
C.The ratio of actual energy produced to the maximum possible energy. 
d. The ratio ct maximum demand on the power station to the connected load.

ANSWER: The ratio of actual energy produced to the maximum possible energy.

37) Capacity factor will be very low when the power plant

a.s operated as base load plant. as well as the peak loads.
b. is operated for supplying base load 
c.operated in emergency only
d. is under maintainance.

ANSWER: is operated in emergency only.

38) A thermal generating station has a installed capacity of 15 MW and supplies a daily lead of 10 Mw for 12 hours and 5 MW for remaining 12 hours The plant capacity factor for this station is......

A)1
 b. 0.75
C.0.67
D.0.5

ANSWER: 0.5

39) In a power station, the cost of generation of power reduces most effectively when..........

a. Diversity factor alone increases 
b. Both diversity factor and load factor increases
c. Only load factor increases
d. Both diversity factor and load factor decreases

ANSWER: Both diversity factor and load factor increases.

40) What is the diversity factor?

a. A ratio of kWh generated to the product of plant capacity and the number of hours for which the plant is in operation 
b. The ratio of sum of individual maximum demands to the maximum demand on power stations.
C.The ratio of actual energy produced to the maximum possible energy
d. The ratio of maximum demand on the power station to the connected load.

ANSWER: The ratio of sum of individual maximum demands to the maximum demand on power stations.

41) What is demand factor?

a. Average load to maximum demand.

b. Maximum demand to connected c. Connected load to maximum demand.
d. Maximum demand to average load.

ANSWER: Maximum demand to connected load.

42) What is the value of demand factor?

a. Greater than unity. 
b. Less than unity.
c. Always more than unity
d. Normally more than unity.

ANSWER: Less than unity.

43) What is connected load?

a. Installed electrical load in the premises of the consumer. 
b. Maximum load a consumer draws
C.Load drawn by a consumer at any instant.  
d. None of the above.

ANSWER: Installed electrical load in the premises of the consumer.

44) The power system experiences peak demand from______

a. Midnight to 8 AM
b. 8 AM to 2 PM
c. 2 P.M to 6 PM 
d. 6 P.M to 10 PM

ANSWER: 6 P.M to 10 PM

45) The maximum demand on the power system is 100 MW. If the annual load factor is 40%. Calculate the total energy generated in a year.

a. 3761* 105 kWh

b. 4174 *105 kWh

c. 3504 *105 kWh 
d. 3500 *105 kWh

ANSWER: 3504 *105 kWh

46) The power demand can be estimated approximately by

a. Load survey method. 
b. Mathematical method.
c. Statistical method.
d. Economic parameters

ANSWER: Statistical method.

47) A generating station has a connected load of 55 MW and maximum demand of 20 MW.
What is the demand factor?

a. 0.4785
b. 0.3636
c 2.75
d. 1100

ANSWER: 0.3636

48) Determine the average demand of a plant if its load factor and maximum demand are 0.60 and 30 MW.

a. 20 MW
 b. 18 MW
C.50 MW
d. 13 MW

ANSWER: 18 MW

49) Utilization factor is defined as the ratio of 
a. Average demand to the rated capacity of the plant,
b. Maximum demand on the power plant to the rated capacity of the power plant. 
c Rated capacity of the power plant to the maximum demand.
d. None of these

ANSWER: Maximum demand on the power plant to the rated capacity of the power plant.

50) A consumer consumes 400 kWh per day at a load factor of 0.3. If he increases the load factor to 0.6 without any increase in maximum demand. What is the consumption of energy in kWh?

a. 800 kWh
b. 650 kWh
c. 1125 kW 
d. 425 kWh

ANSWER: 800 kWh

51) The yearly load duration curve of a power plant is a straight line. The maximum load is 850 MW and minimum load is 650 MW. The capacity of the plant is 950 MW. What is the capacity factor and the utilization factor? 
a. 0.89,  0.78
b. 0.83, 0.65
c.0.78, 0.89 
d. 0,65, 0.83

ANSWER: 0.78, 0.89

52) Interconnected systems have the advantage of

a. Reduced reserve plant capacity, capital cost per kW and economy in operation,
b. Improved load factor, diversity factor and operation efficiency and increased reliability of supply 
c. All of these
d. None of these

ANSWER: All of these

53) Major share of power generated in India is through which means?

a. Hydroelectric power plants.

b. Nuclear power plants. 
C.Thermal power plants.
 d. Gas turbine power plants

ANSWER: Thermal power plants.

54) What is the modern trend in electric power generation?

a. To have a large number of small size thermal plants located at different places.

b. To have large size thermal plants near load centre.

c To have large stze thermal plants located near coal fields.

d. None of the above

ANSWER: To have large size thermal plants located near coal fields.

55) Which among the following plants have the least operating cost? 
a. Steam plants

b. Hydro plants

c. Nuclear plants d. Diesel plants

ANSWER: Hydro plants

56) What are the essential requirements for power plants to be operated as peak load plants?

a. Capability of quick start, synchronisation and taking up of system load.

b. Quick response to load variations

c. Low capital cost 
d. All of these.

e. None of these

ANSWER: All of these.

57) In a steam power station, electric power is generated at what power?

a. 440 V

b. 1.1 kV

C. 11 kV

d. 33 kV

ANSWER: 11 kV

58) Annual operating cost of a generating plant consists of

a Fixed charges 
b. Semi fixed charges

c. Operating or running charges

d. All of these e. None of these

ANSWER: All of these

59) For a nuclear plant, what is its useful life?

a. 10 years

b. 30 years

c 100 years
 d. 60 years

ANSWER: 30 years

60) What happens in a load shedding?
 a .System voltage reduced
B.System frequency is reduced. C.System loads are switched off.
D.System power factor s changed.

ANSWER: System loads are switched off