Plant capacity factor of a power plant may be calculated by the formula:

Sum of individual max. demand / Max. demand of plant

Average demand / plant capacity

Sum of individual max. demand / Max. demand of plant

Station output / Plant Hours of use

Plant capacity / Average demand

Demand factor of a power plant is:

(station energy output) / (plant capacity × hrs of use)

(Average demand) / (maximum demand)

(average demand) / (plant capacity)

(maximum demand) / (connected load)

(station energy output) / (plant capacity × hrs of use)

Plant capacity is defined as ______.

the ratio of the average demand to plant capacity factor

Hot reserve is defined as:

a reserve generating capacity which is in service and in operation

a reserve generating capacity which is not in service but is in operation

a reserve generating capacity which is in service and in operation

a reserve generating capacity which in not in service and not in operation

a reserve generating capacity which is in service but not in operation

In economic operation of a power system, the effect of increased penalty factor between a generating plant and system load current is to

decrease load on the generating plant

How is the most economical voltage selected for transmission in a particular requirement?

Based on Fleming’s right hand rule

Based on Fleming’s left hand rule

Based on Fleming’s right hand rule

Identify the ways by which the cost of power generation can be reduced?

Choosing equipment that is cheaper though it may not be efficient2. Reduce the cost of labour and fuel

Reduce the amount of investment in the plant2. Reduce power generation to match costs

Reduce the amount of investment in the plant2. Reduce the number of men employed in the plant

Choosing equipment that is cheaper though it may not be efficient2. Reduce the cost of labour and fuel

Select the station as a reduce cost of fuel, labour, etc2. Produce minimum power at any given point of time

A low utilization factor for a plant indicates that plant is

Used for peak as well as base load

In a power station, the cost of generation of power reduces most effectively when:

Diversity factor alone increases

Both diversity factor and load factor increase

Both the diversity factor and load factor decrease

Annual load factor of a generation station is equal to

(No of units actually supplied/month) / max. possible demand

(No of units actually supplied/year) / max. possible demand

(No of units actually supplied/month) / (max. possible demand × 8760)

(No of units actually supplied/year) / (max. possible demand × 8760)

108 + Mcqs in Power Generation in Power Plant Page 1 McqOptions

1.	Incremental fuel costs in Rs/MWh for a plant consisting of two generating units are given by\(\frac{{d{F_1}}}{{d{P_1}}} = 0.4{P_1} + 400\;and\frac{{d{F_2}}}{{d{P_2}}} = 0.48{P_2} + 320\)The allocation of loads P1 and P2 between generating units 1 and 2, respectively, for minimum cost of generation to serve a total load of 900 MW, neglecting losses, is
A.	200 MW and 700 MW
B.	500 MW and 400 MW
C.	300 MW and 600 MW
D.	400 MW and 500 MW
Answer» E.

Discussion

2.	A generating station has a maximum demand of 500 MW. The annual load factor is 50 percent. The energy generated per annum will be:
A.	2.19 × 106 MWhr
B.	600 MWhr
C.	250 MWhr
D.	7.50 × 106 MWhr
Answer» B. 600 MWhr

Discussion

3.	If the fuel cost of one unit, operating in parallel with other units, is increased and it is desired to maintain fuel cost, the load on the unit will be
A.	increased
B.	held constant
C.	decreased
D.	unaffected
Answer» D. unaffected

Discussion

4.	A generating station has 500 MW maximum demand and annual load factor of 50%, capacity factor of 40%. The reserve capacity of the plant is
A.	125 MW
B.	625 MW
C.	500 MW
D.	725 MW
Answer» B. 625 MW

Discussion

5.	Maximum demand meter indicates
A.	kVA rating
B.	kW rating
C.	kVAR rating
D.	None of the above
Answer» B. kW rating

Discussion

6.	A power generating station has a maximum demand of 1000 MW. The annual load demand of 1000 MW. The annual load factor is 75% and plant capacity factor is 60%. Calculate the reserve capacity.
A.	250 MW
B.	500 MW
C.	750 MW
D.	1250 MW
Answer» B. 500 MW

Discussion

7.	A consumer consumes 600 kWh per day at a load factor of 0.5. Without increasing the maximum demand, if the consumer increases the load factor to 0.8, the consumption of energy in kWh would be:
A.	480
B.	960
C.	900
D.	300
Answer» C. 900

Discussion

8.	Plant capacity factor of a power plant may be calculated by the formula:
A.	Average demand / plant capacity
B.	Sum of individual max. demand / Max. demand of plant
C.	Station output / Plant Hours of use
D.	Plant capacity / Average demand
Answer» B. Sum of individual max. demand / Max. demand of plant

Discussion

9.	Base load power plants areP. wind farmsQ. run – of – river plantsR. nuclear power plantsS. diesel power plants
A.	P, Q and S only
B.	P, R and S only
C.	P, Q and R only
D.	Q and R only
Answer» D. Q and R only

Discussion

10.	Demand factor of a power plant is:
A.	(Average demand) / (maximum demand)
B.	(average demand) / (plant capacity)
C.	(maximum demand) / (connected load)
D.	(station energy output) / (plant capacity × hrs of use)
Answer» D. (station energy output) / (plant capacity × hrs of use)

Discussion

11.	Load duration curve is the plot between:
A.	load and time
B.	load and frequency
C.	load and temperature
D.	load and voltage
Answer» B. load and frequency

Discussion

12.	A power plant with 80 MW capacity has a peak load of 60 MW. Loads with maximum demands of 30 MW, 20 MW, 10 MW and 15 MW are connected to the plant. Find the diversity factor.
A.	0.8
B.	1.33
C.	1.25
D.	0.75
Answer» D. 0.75

Discussion

13.	A load centre of 120 MW derives power from two power stations connected by 220 kV transmission lines of 25 km and 75 km as shown in figure below. The three generators G1, G2 and G3 are of 100 MW capacity each and have identical fuel cost characteristics. The minimum loss generation schedule for supplying the 120 MW load is?
A.	P1 = 90 MWP2 = 15 MWP3 = 15 MW
B.	P1 = 80 MWP2 = 20 MWP3 = 20 MW
C.	P1 = 60 MWP2 = 30 MWP3 = 30 MW
D.	P1 = 40 MWP2 = 40 MWP3 = 40 MW
Answer» B. P1 = 80 MWP2 = 20 MWP3 = 20 MW

Discussion

14.	A generating station has an installed capacity of 400 MW. Plant capacity factor is 0.6 and annual load factor is 0.8. capital cost is Rs. 1010 and annual running charges are Rs. 109. What is the cost per unit generated if the annual interest and depreciation is 20 percent?
A.	42 paise
B.	242 paise
C.	14.2 paise
D.	142 paise
Answer» E.

Discussion

15.	A generating station has fan installed capacity of 50 MW and delivers 220 MWh per annum. If the annual fixed charges are Rs. 160 per MW installed capacity and running charges are 4 paise per kWh, determine the cost per unit generated.
A.	4 paise
B.	2 paise
C.	10 paise
D.	8 paise
Answer» E.

Discussion

16.	A steam power plant produces 1 unit of electrical energy by using 0.5 kg of coal and its overall efficiency is 20%. Calculate the calorific value of fuel.
A.	6600 kcal/kg
B.	8000 kcal/kg
C.	8600 kcal/kg
D.	8400 kcal/kg
Answer» D. 8400 kcal/kg

Discussion

17.	A plant having load factor of 0.6 has a peak load of 100 MW. The energy produced by this plant for a month of 30 days is:
A.	432 × 105 units
B.	211 × 103 units
C.	412 × 103 units
D.	2000 units
Answer» B. 211 × 103 units

Discussion

18.	Plant capacity is defined as ______.
A.	minimum load it can supply
B.	average load connected to it
C.	the ratio of the average demand to plant capacity factor
D.	average power it can supply
Answer» D. average power it can supply

Discussion

19.	Area under the daily load curve divided by 24 gives
A.	Average load
B.	Maximum demand
C.	Units generated
D.	Plant capacity
Answer» B. Maximum demand

Discussion

20.	Hot reserve is defined as:
A.	a reserve generating capacity which is not in service but is in operation
B.	a reserve generating capacity which is in service and in operation
C.	a reserve generating capacity which in not in service and not in operation
D.	a reserve generating capacity which is in service but not in operation
Answer» B. a reserve generating capacity which is in service and in operation

Discussion

21.	A power system has two synchronous generators whose governor turbine characteristics are given by P1 = 50(50 - f) MW and P2 = 100(52 - f) MW, where f is the system frequency. When the total load supplied is 1000 MW, what is the system frequency if the operation is lossless.
A.	58 Hz
B.	44.66 Hz
C.	52.4 Hz
D.	48 Hz
Answer» C. 52.4 Hz

Discussion

22.	Calculate the January month electricity bill for a room containing 40 W lamp working 10 hours daily and the unit cost is 1 rupee.
A.	13.4 rupees
B.	12.4 rupees
C.	11.4 rupees
D.	10.4 rupees
Answer» C. 11.4 rupees

Discussion

23.	In economic operation of a power system, the effect of increased penalty factor between a generating plant and system load current is to
A.	decrease load on the generating plant
B.	increase load on the plant
C.	hold the plant load constant
D.	increase power factor
Answer» B. increase load on the plant

Discussion

24.	Cost of equipment used in power system is Rs. 1,00,000 and its scrap value is Rs. 10,000 after a useful life of 20 years. What is the annual depreciation charge of the equipment?
A.	Rs. 5,000
B.	Rs. 5,500
C.	Rs. 500
D.	Rs. 4,500
Answer» E.

Discussion

25.	A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the plant capacity.
A.	18.75 kW
B.	1875 MW
C.	1875 kW
D.	18.75 MW
Answer» E.

Discussion

26.	An industrial consumer has a daily load pattern of 4000 kVA at 0.8 lag for 8 hrs and 1000 kVA at unity power factor for 16 hrs. The daily load factor is:
A.	1
B.	2
C.	0.75
D.	0.54
Answer» E.

Discussion

27.	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. The load factor is _____.
A.	0.5
B.	0.75
C.	0.6
D.	2
Answer» C. 0.6

Discussion

28.	A power station has the following daily load cycle.Determine its average load
A.	40 MW
B.	30 MW
C.	35 MW
D.	25 MW
Answer» D. 25 MW

Discussion

29.	A diesel engine power plant has one 700 kW and two 500 kW generating units. The fuel consumption is 0.25 kg per kWh. Estimate the fuel oil required for a day if the plant capacity factor = 40%.
A.	4080 kg
B.	4000 kg
C.	4209 kg
D.	5230 kg
Answer» B. 4000 kg

Discussion

30.	Determine the load factor for the following load curve.
A.	0.63
B.	0.58
C.	0.76
D.	0.65
Answer» C. 0.76

Discussion

31.	A power plant generates 192,000 kWh of electrical energy in a day, and its peak load is 20,000 kWh, its daily load factor is:
A.	0.004
B.	0.4
C.	0.04
D.	4
Answer» C. 0.04

Discussion

32.	Domestic consumer load is around:
A.	5 kW
B.	40 kW
C.	120 kW
D.	80 kW
Answer» B. 40 kW

Discussion

33.	How is the most economical voltage selected for transmission in a particular requirement?
A.	Based on Fleming’s left hand rule
B.	Based on Kelvin’s law
C.	Based on Fleming’s right hand rule
D.	Based on Lenz law
Answer» C. Based on Fleming’s right hand rule

Discussion

34.	Approximate estimation of power demand can be made by:i) Load survey methodii) Statistical methodsiii) Mathematical methodiv) Economic parametersWhich of these are correct?
A.	(ii) and (iii) only
B.	(i), (ii), (iii) and (iv)
C.	(i) and (ii) only
D.	(i), (ii) and (iii) only
Answer» C. (i) and (ii) only

Discussion

35.	Identify the ways by which the cost of power generation can be reduced?
A.	Reduce the amount of investment in the plant2. Reduce power generation to match costs
B.	Reduce the amount of investment in the plant2. Reduce the number of men employed in the plant
C.	Choosing equipment that is cheaper though it may not be efficient2. Reduce the cost of labour and fuel
D.	Select the station as a reduce cost of fuel, labour, etc2. Produce minimum power at any given point of time
Answer» C. Choosing equipment that is cheaper though it may not be efficient2. Reduce the cost of labour and fuel

Discussion

36.	A power station has a maximum demand of 2500 kW and number of kWh generated per year is 45 × 105. The load factor is
A.	10.25%
B.	20.5%
C.	41%
D.	82%
Answer» C. 41%

Discussion

37.	A low utilization factor for a plant indicates that plant is
A.	Used for stand by purposes
B.	Under maintenance
C.	Used for base load only
D.	Used for peak as well as base load
Answer» B. Under maintenance

Discussion

38.	Determine the average load from the load curve.
A.	40 MW
B.	50 MW
C.	45 MW
D.	55 MW
Answer» C. 45 MW

Discussion

39.	A generating station produces 61.5 Mega Units per annum. It is connected to a load of 50 MW and its maximum demand of 20 MW. Determine the demand factor of the station.
A.	0.4
B.	0.5
C.	0.6
D.	0.2
Answer» B. 0.5

Discussion

40.	A power station has 4 consumers with their maximum demand as 40 MW, 20 MW, 30 MW and 50 MW. The maximum demand of the station is 100 MW. The diversity factor of the plant is ______.
A.	0.5
B.	0.2
C.	1.4
D.	0.35
Answer» D. 0.35

Discussion

41.	An industrial consumer has a load pattern of 2000 kW at 0.8 lagging for 12 hours and 1000 kW at unity power factor for 12 hours. Its load factor is
A.	0.6
B.	0.8
C.	0.5
D.	0.75
Answer» E.

Discussion

42.	A power station has a maximum demand of 15,000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the reserve capacity of the plant.
A.	37.5 kW
B.	3.75 MW
C.	375 kW
D.	37.5 MW
Answer» C. 375 kW

Discussion

43.	A consumer has a maximum demand of 200 kW at 40% load factor, and units consumed per year are 700.8 k units. If the tariff is Rs. 100 per kW of maximum demand plus 10 paise per kWh, calculate the annual charges.
A.	Rs. 70,080
B.	Rs. 80,090
C.	Rs. 90,080
D.	Rs. 80,500
Answer» D. Rs. 80,500

Discussion

44.	A generating station supplies the following loads to various consumers A = 1,500 kW, B = 750 kW, C = 100 kW, D = 450 kW. If the maximum demand on station is 2,500 kW, find the diversity factor.
A.	1.12
B.	1.89
C.	1.56
D.	0.8
Answer» B. 1.89

Discussion

45.	For a generating station, diversity factor is always:
A.	Less than one
B.	Greater than one
C.	Equal to zero
D.	None of the given option
Answer» C. Equal to zero

Discussion

46.	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 increase
C.	Load factor alone increases
D.	Both the diversity factor and load factor decrease
Answer» C. Load factor alone increases

Discussion

47.	A system has connected load of 120 kW, peak load of 100 kW, base load of 25 kW and average load of 48 kW. The load factor of the consumer is
A.	40%
B.	48%
C.	25%
D.	83.3%
Answer» C. 25%

Discussion

48.	A consumer has a maximum demand of 200 kW at 40% load factor. If the tariff is Rs. 200 per kW of maximum demand plus 10 paise per kWh, find the annual charges.
A.	Rs. 1,10,080
B.	Rs. 90,080
C.	Rs. 1,50,080
D.	Rs. 1,20,080
Answer» B. Rs. 90,080

Discussion

49.	Annual load factor of a generation station is equal to
A.	(No of units actually supplied/month) / max. possible demand
B.	(No of units actually supplied/year) / max. possible demand
C.	(No of units actually supplied/month) / (max. possible demand × 8760)
D.	(No of units actually supplied/year) / (max. possible demand × 8760)
Answer» E.

Discussion

50.	A consumer has a maximum demand of 250 kW at 40% load factor. If the tariff is Rs. 100 per kW of maximum demand plus 10 paise per kWh, find the annual overall cost per kWh.
A.	1126/876
B.	876/1126
C.	8760/1126
D.	1126/8760
Answer» E.

Discussion

Explore topic-wise MCQs in Power Plant.

A generating station has a maximum demand of 500 MW. The annual load factor is 50 percent. The energy generated per annum will be:

If the fuel cost of one unit, operating in parallel with other units, is increased and it is desired to maintain fuel cost, the load on the unit will be

A generating station has 500 MW maximum demand and annual load factor of 50%, capacity factor of 40%. The reserve capacity of the plant is

Maximum demand meter indicates

A power generating station has a maximum demand of 1000 MW. The annual load demand of 1000 MW. The annual load factor is 75% and plant capacity factor is 60%. Calculate the reserve capacity.

A consumer consumes 600 kWh per day at a load factor of 0.5. Without increasing the maximum demand, if the consumer increases the load factor to 0.8, the consumption of energy in kWh would be:

Plant capacity factor of a power plant may be calculated by the formula:

Base load power plants areP. wind farmsQ. run – of – river plantsR. nuclear power plantsS. diesel power plants

Demand factor of a power plant is:

Load duration curve is the plot between:

A power plant with 80 MW capacity has a peak load of 60 MW. Loads with maximum demands of 30 MW, 20 MW, 10 MW and 15 MW are connected to the plant. Find the diversity factor.

A generating station has an installed capacity of 400 MW. Plant capacity factor is 0.6 and annual load factor is 0.8. capital cost is Rs. 1010 and annual running charges are Rs. 109. What is the cost per unit generated if the annual interest and depreciation is 20 percent?

A generating station has fan installed capacity of 50 MW and delivers 220 MWh per annum. If the annual fixed charges are Rs. 160 per MW installed capacity and running charges are 4 paise per kWh, determine the cost per unit generated.

A steam power plant produces 1 unit of electrical energy by using 0.5 kg of coal and its overall efficiency is 20%. Calculate the calorific value of fuel.

A plant having load factor of 0.6 has a peak load of 100 MW. The energy produced by this plant for a month of 30 days is:

Plant capacity is defined as ______.

Area under the daily load curve divided by 24 gives

Hot reserve is defined as:

A power system has two synchronous generators whose governor turbine characteristics are given by P1 = 50(50 - f) MW and P2 = 100(52 - f) MW, where f is the system frequency. When the total load supplied is 1000 MW, what is the system frequency if the operation is lossless.

Calculate the January month electricity bill for a room containing 40 W lamp working 10 hours daily and the unit cost is 1 rupee.

In economic operation of a power system, the effect of increased penalty factor between a generating plant and system load current is to

Cost of equipment used in power system is Rs. 1,00,000 and its scrap value is Rs. 10,000 after a useful life of 20 years. What is the annual depreciation charge of the equipment?

A power station has a maximum demand of 15000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the plant capacity.

An industrial consumer has a daily load pattern of 4000 kVA at 0.8 lag for 8 hrs and 1000 kVA at unity power factor for 16 hrs. The daily load factor is:

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. The load factor is _____.

A power station has the following daily load cycle.Determine its average load

A diesel engine power plant has one 700 kW and two 500 kW generating units. The fuel consumption is 0.25 kg per kWh. Estimate the fuel oil required for a day if the plant capacity factor = 40%.

Determine the load factor for the following load curve.

A power plant generates 192,000 kWh of electrical energy in a day, and its peak load is 20,000 kWh, its daily load factor is:

Domestic consumer load is around:

How is the most economical voltage selected for transmission in a particular requirement?

Approximate estimation of power demand can be made by:i) Load survey methodii) Statistical methodsiii) Mathematical methodiv) Economic parametersWhich of these are correct?

Identify the ways by which the cost of power generation can be reduced?

A power station has a maximum demand of 2500 kW and number of kWh generated per year is 45 × 105. The load factor is

A low utilization factor for a plant indicates that plant is

Determine the average load from the load curve.

A generating station produces 61.5 Mega Units per annum. It is connected to a load of 50 MW and its maximum demand of 20 MW. Determine the demand factor of the station.

A power station has 4 consumers with their maximum demand as 40 MW, 20 MW, 30 MW and 50 MW. The maximum demand of the station is 100 MW. The diversity factor of the plant is ______.

An industrial consumer has a load pattern of 2000 kW at 0.8 lagging for 12 hours and 1000 kW at unity power factor for 12 hours. Its load factor is

A power station has a maximum demand of 15,000 kW. The annual load factor is 50% and plant capacity factor is 40%. Determine the reserve capacity of the plant.

A consumer has a maximum demand of 200 kW at 40% load factor, and units consumed per year are 700.8 k units. If the tariff is Rs. 100 per kW of maximum demand plus 10 paise per kWh, calculate the annual charges.

A generating station supplies the following loads to various consumers A = 1,500 kW, B = 750 kW, C = 100 kW, D = 450 kW. If the maximum demand on station is 2,500 kW, find the diversity factor.

For a generating station, diversity factor is always:

In a power station, the cost of generation of power reduces most effectively when:

A system has connected load of 120 kW, peak load of 100 kW, base load of 25 kW and average load of 48 kW. The load factor of the consumer is

A consumer has a maximum demand of 200 kW at 40% load factor. If the tariff is Rs. 200 per kW of maximum demand plus 10 paise per kWh, find the annual charges.

Annual load factor of a generation station is equal to

A consumer has a maximum demand of 250 kW at 40% load factor. If the tariff is Rs. 100 per kW of maximum demand plus 10 paise per kWh, find the annual overall cost per kWh.