96 + Mcqs in Power Systems McqOptions

1.	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
Answer» E.

Discussion

2.	For a nuclear plant, what is its useful life?
A.	10 years.
B.	30 years
C.	100 years
D.	60 years
Answer» C. 100 years

Discussion

3.	What happens in a load shedding?
A.	System voltage is reduced.
B.	System frequency is reduced.
C.	System loads are switched off.
D.	System power factor is changed.
Answer» D. System power factor is changed.

Discussion

4.	Why is load shedding done?
A.	Reducing peak demand on the system.
B.	Repairing of machines.
C.	Power factor improvement.
D.	Efficient operation of equipment.
Answer» B. Repairing of machines.

Discussion

5.	Generators for the base load plants are usually designed for maximum efficiency around
A.	20% overload
B.	Full load
C.	75% full load
D.	None of these
Answer» C. 75% full load

Discussion

6.	What are fixed charges?
A.	Cost of investment irrespective of energy generated.
B.	Operating cost of the fuel along with cost of investment plant.
C.	Operating cost only.
D.	None of the above
Answer» B. Operating cost of the fuel along with cost of investment plant.

Discussion

7.	Which components are included in the annual operating cost?
A.	Fuel, maintenance cost and labour
B.	Interest, taxes, insurance and depreciation
C.	Both (a) and (b)
D.	None of the above
Answer» B. Interest, taxes, insurance and depreciation

Discussion

8.	What does the annual fixed cost include?
A.	Fuel, maintenance cost and labour
B.	Interest, taxes, insurance and depreciation
C.	Both (a) and (b)
D.	None of the above
Answer» C. Both (a) and (b)

Discussion

9.	The capital cost of a power plant depends on ________________.
A.	Total installed capacity only
B.	Total number of units only
C.	Both (a) and (b)
D.	None of these
Answer» D. None of these

Discussion

10.	What is meant by semi fixed charges?
A.	It is the cost which is independent of maximum demands and units generated.
B.	It is the cost which depends only on the units generated.
C.	It is the cost which depends upon the maximum demand but it is independent of units generated.
D.	None of these.
Answer» D. None of these.

Discussion

11.	The annual depreciation reserve depends on _______________.
A.	Capital cost only.
B.	Salvage value only.
C.	On any method of calculation of depreciation factor.
D.	All of these
Answer» E.

Discussion

12.	Depreciation charge may be based on which method?
A.	Straight line method.
B.	Sinking fund method.
C.	Both (a) & (b).
D.	None of these.
Answer» D. None of these.

Discussion

13.	In a straight line method, annual depreciation charges are calculated by
A.	The capital cost minus salvage value divided by the number of years of life.
B.	The capital cost divided by the number of years of life.
C.	Both (a) and (b).
D.	None of these
Answer» B. The capital cost divided by the number of years of life.

Discussion

14.	The most suitable location for the power factor improvement device is
A.	Near the electrical appliance which is responsible for the poor power factor.
B.	At the sending end.
C.	At the receiving end in case of transmission lines.
D.	Both (a) and (c).
Answer» E.

Discussion

15.	A transformer costing Rs 90,000 haws a useful life of 20 years. Determine the annual depreciation charge using straight line method. Assume salvage to be 15,000.
A.	4000
B.	3750
C.	4350
D.	3500
Answer» C. 4350

Discussion

16.	What is tariff?
A.	The rate at which electrical energy is produced in the plant.
B.	The rate at which electrical energy is supplied to the consumers.
C.	Both (a) and (b).
D.	None of these.
Answer» C. Both (a) and (b).

Discussion

17.	Flat rate tariff is charged on what basis?
A.	Connected load.
B.	Units consumed.
C.	Maximum demand.
D.	All of these
Answer» C. Maximum demand.

Discussion

18.	Domestic consumers are charged _____________.
A.	Flat demand tariff
B.	Block rate tariff
C.	Flat rate tariff
D.	Off peak tariff
Answer» C. Flat rate tariff

Discussion

19.	Which tariff is used by the small commercial consumers?
A.	Maximum demand tariff
B.	Block rate tariff
C.	Three part tariff
D.	Two part tariff
Answer» C. Three part tariff

Discussion

20.	Block rate tariff, where energy charge decreases with the increase in energy consumption,
A.	Encourages the consumers for more consumption.
B.	Discourages the consumers for more consumption.
C.	Encourages the consumers to restrict their demand.
D.	Encourages the consumers to improve the power factor.
Answer» B. Discourages the consumers for more consumption.

Discussion

21.	Two part tariff is charged on what basis?
A.	Connected load
B.	Units consumed
C.	Maximum demand
D.	Both (b) and (c)
Answer» E.

Discussion

22.	Fixed charge is dependent on what factor?
A.	Energy consumption
B.	Maximum demand
C.	Peak load demand
D.	All of the above
Answer» C. Peak load demand

Discussion

23.	A variable charge is based on what?
A.	Energy consumption
B.	Maximum demand
C.	Peak load demand
D.	All of the above
Answer» B. Maximum demand

Discussion

24.	What is the main disadvantage of two port tariff?
A.	He has to pay semi fixed charges.
B.	He has to pay fixed charges.
C.	He has to pay running charges.
D.	None of the above.
Answer» B. He has to pay fixed charges.

Discussion

25.	Which among the following are included in the three part tariff? i. Fixed charges  ii. Running charges iii. Semi fixed charges.
A.	i, ii and iii
B.	i and ii
C.	i and iii
D.	ii and iii
Answer» B. i and ii

Discussion

26.	Which tariff is most ideal tariff for the consumer?
A.	Two part tariff
B.	Three part tariff
C.	Both (a) and (b)
D.	None of the above
Answer» C. Both (a) and (b)

Discussion

27.	What is the difference between two part tariff and maximum demand tariff?
A.	A separate meter is used
B.	A separate maximum demand meter is used
C.	Semi fixed charges are also included
D.	All of these
Answer» C. Semi fixed charges are also included

Discussion

28.	Maximum demand tariff is applied for which kind of consumers?
A.	Big consumers
B.	Small consumers
C.	Residential consumers
D.	All of these
Answer» B. Small consumers

Discussion

29.	Why is Maximum demand tariff not applicable to domestic consumers?
A.	Low maximum demand
B.	Low load factor
C.	Lower energy consumption
D.	Low power factor
Answer» B. Low load factor

Discussion

30.	Why is a big consumer charged at a lower rate than the small consumer?
A.	Their maximum demand is small.
B.	It improves the load factor.
C.	Both (a) and (b).
D.	None of these.
Answer» C. Both (a) and (b).

Discussion

31.	What is the power factor tariff?
A.	It considers only maximum demand.
B.	It considers only semi fixed charges and the power factor.
C.	It considers only power factor.
D.	It considers the load factor.
Answer» E.

Discussion

32.	What is/are the consequence/s of low power factor?
A.	Increases the rating of station equipments only
B.	Only line losses increases
C.	Both (a) and (b)
D.	None of these
Answer» D. None of these

Discussion

33.	A consumer having lower power factor contributes towards which factor?
A.	Semi fixed charges.
B.	Fixed charges.
C.	Running charges.
D.	Penalty is imposed.
Answer» C. Running charges.

Discussion

34.	Which tariff is also known as the average power factor tariff?
A.	Sliding scale tariff
B.	kW tariff
C.	kVAR tariff
D.	kVA maximum demand tariff
Answer» B. kW tariff

Discussion

35.	What is maximum value of power factor?
A.	0.5
B.	1
C.	1.5
D.	0.95
Answer» C. 1.5

Discussion

36.	Active power and apparent power are respectively represented by _________.
A.	kW and kVAR
B.	kVAR and kVA
C.	kVA and kVAR
D.	kW and kVA
Answer» E.

Discussion

37.	Which among the following happens in a low power factor?
A.	Large kVA rating of the equipment.
B.	Greater conductor size.
C.	Reduced handling capacity of the system.
D.	All of the above.
Answer» E.

Discussion

38.	Lower power factor is usually not due to ____________.
A.	Discharge lamp
B.	Arc lamps
C.	Incandescent lamps
D.	Induction furnace
Answer» D. Induction furnace

Discussion

39.	For a consumer what is the most economical power factor?
A.	0.25 – 0.5 lagging
B.	0.25 – 0.5 leading
C.	0.85 – 0.95 lagging
D.	0.85 – 0.95 leading
Answer» D. 0.85 – 0.95 leading

Discussion

40.	The primary reason for the low power factor is due to the installation of
A.	Induction motors
B.	DC motors
C.	Synchronous motors
D.	Commutator motors
Answer» B. DC motors

Discussion

41.	For which among the following consumers is penalty imposed for low power factor?
A.	Residential and commercial consumers.
B.	Industrial consumers
C.	Agricultural consumers.
D.	All of the above.
Answer» D. All of the above.

Discussion

42.	Power factor can be improved by connecting which among these?
A.	Static capacitors.
B.	Resistors.
C.	Synchronous condensers.
D.	Both (a) and (c).
Answer» E.

Discussion

43.	What is the advantage of the static capacitors?
A.	Low losses
B.	Easy installation
C.	Lower maintenance
D.	All of the above
Answer» E.

Discussion

44.	Which among these is the advantage of synchronous condensers?
A.	Helps in achieving the stepless control of power factor.
B.	The motor windings have a lower thermal stability.
C.	The maintenance cost is low.
D.	All of the above.
Answer» B. The motor windings have a lower thermal stability.

Discussion

45.	Phase advancers are used for which among the following machines?
A.	Transformers
B.	Synchronous machines
C.	Induction motors
D.	DC machines
Answer» D. DC machines

Discussion

46.	What is the main disadvantage of phase advancers?
A.	Cannot be used for motors below 200 H.P
B.	Produces noise
C.	Can be used where synchronous motor is un admissible
D.	None of these
Answer» B. Produces noise

Discussion

Explore topic-wise MCQs in Testing Subject.

Annual&nbsp;operating&nbsp;cost&nbsp;of&nbsp;a&nbsp;generating&nbsp;plant&nbsp;consists&nbsp;of&nbsp;

&nbsp;For&nbsp;a&nbsp;nuclear&nbsp;plant,&nbsp;what&nbsp;is&nbsp;its&nbsp;useful&nbsp;life?&nbsp;

&nbsp;&nbsp;What&nbsp;happens&nbsp;in&nbsp;a&nbsp;load&nbsp;shedding?&nbsp;

Why&nbsp;is&nbsp;load&nbsp;shedding&nbsp;done?&nbsp;

Generators&nbsp;for&nbsp;the&nbsp;base&nbsp;load&nbsp;plants&nbsp;are&nbsp;usually&nbsp;designed&nbsp;for&nbsp;maximum&nbsp;efficiency&nbsp;around&nbsp;

What&nbsp;are&nbsp;fixed&nbsp;charges?

Which&nbsp;components&nbsp;are&nbsp;included&nbsp;in&nbsp;the&nbsp;annual&nbsp;operating&nbsp;cost?&nbsp;

&nbsp;&nbsp;&nbsp;What&nbsp;does&nbsp;the&nbsp;annual&nbsp;fixed&nbsp;cost&nbsp;include?&nbsp;

&nbsp;The&nbsp;capital&nbsp;cost&nbsp;of&nbsp;a&nbsp;power&nbsp;plant&nbsp;depends&nbsp;on&nbsp;________________.&nbsp;

&nbsp;What&nbsp;is&nbsp;meant&nbsp;by&nbsp;semi&nbsp;fixed&nbsp;charges?&nbsp;

&nbsp;The&nbsp;annual&nbsp;depreciation&nbsp;reserve&nbsp;depends&nbsp;on&nbsp;_______________.&nbsp;

Depreciation&nbsp;charge&nbsp;may&nbsp;be&nbsp;based&nbsp;on&nbsp;which&nbsp;method?&nbsp;

&nbsp;In&nbsp;a&nbsp;straight&nbsp;line&nbsp;method,&nbsp;annual&nbsp;depreciation&nbsp;charges&nbsp;are&nbsp;calculated&nbsp;by&nbsp;

&nbsp;&nbsp;The&nbsp;most&nbsp;suitable&nbsp;location&nbsp;for&nbsp;the&nbsp;power&nbsp;factor&nbsp;improvement&nbsp;device&nbsp;is

&nbsp;A&nbsp;transformer&nbsp;costing&nbsp;Rs&nbsp;90,000&nbsp;haws&nbsp;a&nbsp;useful&nbsp;life&nbsp;of&nbsp;20&nbsp;years.&nbsp;Determine&nbsp;the&nbsp;annual&nbsp;depreciation&nbsp;charge&nbsp;using&nbsp;straight&nbsp;line&nbsp;method.&nbsp;Assume&nbsp;salvage&nbsp;to&nbsp;be&nbsp;15,000.&nbsp;

What&nbsp;is&nbsp;tariff?&nbsp;

Flat&nbsp;rate&nbsp;tariff&nbsp;is&nbsp;charged&nbsp;on&nbsp;what&nbsp;basis?

&nbsp;Domestic&nbsp;consumers&nbsp;are&nbsp;charged&nbsp;_____________.&nbsp;

Which&nbsp;tariff&nbsp;is&nbsp;used&nbsp;by&nbsp;the&nbsp;small&nbsp;commercial&nbsp;consumers?

&nbsp;Block&nbsp;rate&nbsp;tariff,&nbsp;where&nbsp;energy&nbsp;charge&nbsp;decreases&nbsp;with&nbsp;the&nbsp;increase&nbsp;in&nbsp;energy&nbsp;consumption,&nbsp;

Two&nbsp;part&nbsp;tariff&nbsp;is&nbsp;charged&nbsp;on&nbsp;what&nbsp;basis?

&nbsp;Fixed&nbsp;charge&nbsp;is&nbsp;dependent&nbsp;on&nbsp;what&nbsp;factor?&nbsp;

&nbsp;A&nbsp;variable&nbsp;charge&nbsp;is&nbsp;based&nbsp;on&nbsp;what?&nbsp;

What&nbsp;is&nbsp;the&nbsp;main&nbsp;disadvantage&nbsp;of&nbsp;two&nbsp;port&nbsp;tariff?&nbsp;

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;are&nbsp;included&nbsp;in&nbsp;the&nbsp;three&nbsp;part&nbsp;tariff? i.&nbsp;Fixed&nbsp;charges&nbsp; ii.&nbsp;Running&nbsp;charges iii.&nbsp;Semi&nbsp;fixed&nbsp;charges.

&nbsp;&nbsp;Which&nbsp;tariff&nbsp;is&nbsp;most&nbsp;ideal&nbsp;tariff&nbsp;for&nbsp;the&nbsp;consumer?&nbsp;

What&nbsp;is&nbsp;the&nbsp;difference&nbsp;between&nbsp;two&nbsp;part&nbsp;tariff&nbsp;and&nbsp;maximum&nbsp;demand&nbsp;tariff?&nbsp;

Maximum&nbsp;demand&nbsp;tariff&nbsp;is&nbsp;applied&nbsp;for&nbsp;which&nbsp;kind&nbsp;of&nbsp;consumers?&nbsp;

Why&nbsp;is&nbsp;Maximum&nbsp;demand&nbsp;tariff&nbsp;not&nbsp;applicable&nbsp;to&nbsp;domestic&nbsp;consumers?&nbsp;

Why&nbsp;is&nbsp;a&nbsp;big&nbsp;consumer&nbsp;charged&nbsp;at&nbsp;a&nbsp;lower&nbsp;rate&nbsp;than&nbsp;the&nbsp;small&nbsp;consumer?&nbsp;

What&nbsp;is&nbsp;the&nbsp;power&nbsp;factor&nbsp;tariff?&nbsp;

&nbsp;What&nbsp;is/are&nbsp;the&nbsp;consequence/s&nbsp;of&nbsp;low&nbsp;power&nbsp;factor?&nbsp;

A&nbsp;consumer&nbsp;having&nbsp;lower&nbsp;power&nbsp;factor&nbsp;contributes&nbsp;towards&nbsp;which&nbsp;factor?&nbsp;

&nbsp;Which&nbsp;tariff&nbsp;is&nbsp;also&nbsp;known&nbsp;as&nbsp;the&nbsp;average&nbsp;power&nbsp;factor&nbsp;tariff?&nbsp;

What&nbsp;is&nbsp;maximum&nbsp;value&nbsp;of&nbsp;power&nbsp;factor?&nbsp;

Active&nbsp;power&nbsp;and&nbsp;apparent&nbsp;power&nbsp;are&nbsp;respectively&nbsp;represented&nbsp;by&nbsp;_________.&nbsp;

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;happens&nbsp;in&nbsp;a&nbsp;low&nbsp;power&nbsp;factor?&nbsp;

Lower&nbsp;power&nbsp;factor&nbsp;is&nbsp;usually&nbsp;not&nbsp;due&nbsp;to&nbsp;____________.&nbsp;

For&nbsp;a&nbsp;consumer&nbsp;what&nbsp;is&nbsp;the&nbsp;most&nbsp;economical&nbsp;power&nbsp;factor?&nbsp;

The&nbsp;primary&nbsp;reason&nbsp;for&nbsp;the&nbsp;low&nbsp;power&nbsp;factor&nbsp;is&nbsp;due&nbsp;to&nbsp;the&nbsp;installation&nbsp;of

For&nbsp;which&nbsp;among&nbsp;the&nbsp;following&nbsp;consumers&nbsp;is&nbsp;penalty&nbsp;imposed&nbsp;for&nbsp;low&nbsp;power&nbsp;factor?

Power&nbsp;factor&nbsp;can&nbsp;be&nbsp;improved&nbsp;by&nbsp;connecting&nbsp;which&nbsp;among&nbsp;these?&nbsp;

What&nbsp;is&nbsp;the&nbsp;advantage&nbsp;of&nbsp;the&nbsp;static&nbsp;capacitors?&nbsp;

Which&nbsp;among&nbsp;these&nbsp;is&nbsp;the&nbsp;advantage&nbsp;of&nbsp;synchronous&nbsp;condensers?&nbsp;

&nbsp;Phase&nbsp;advancers&nbsp;are&nbsp;used&nbsp;for&nbsp;which&nbsp;among&nbsp;the&nbsp;following&nbsp;machines?&nbsp;

What&nbsp;is&nbsp;the&nbsp;main&nbsp;disadvantage&nbsp;of&nbsp;phase&nbsp;advancers?&nbsp;

Annual operating cost of a generating plant consists of

For a nuclear plant, what is its useful life?

What happens in a load shedding?

Why is load shedding done?

Generators for the base load plants are usually designed for maximum efficiency around

What are fixed charges?

Which components are included in the annual operating cost?

What does the annual fixed cost include?

The capital cost of a power plant depends on ________________.

What is meant by semi fixed charges?

The annual depreciation reserve depends on _______________.

Depreciation charge may be based on which method?

In a straight line method, annual depreciation charges are calculated by

The most suitable location for the power factor improvement device is

A transformer costing Rs 90,000 haws a useful life of 20 years. Determine the annual depreciation charge using straight line method. Assume salvage to be 15,000.

What is tariff?

Flat rate tariff is charged on what basis?

Domestic consumers are charged _____________.

Which tariff is used by the small commercial consumers?

Block rate tariff, where energy charge decreases with the increase in energy consumption,

Two part tariff is charged on what basis?

Fixed charge is dependent on what factor?

A variable charge is based on what?

What is the main disadvantage of two port tariff?

Which among the following are included in the three part tariff? i. Fixed charges ii. Running charges iii. Semi fixed charges.

Which tariff is most ideal tariff for the consumer?

What is the difference between two part tariff and maximum demand tariff?

Maximum demand tariff is applied for which kind of consumers?

Why is Maximum demand tariff not applicable to domestic consumers?

Why is a big consumer charged at a lower rate than the small consumer?

What is the power factor tariff?

What is/are the consequence/s of low power factor?

A consumer having lower power factor contributes towards which factor?

Which tariff is also known as the average power factor tariff?

What is maximum value of power factor?

Active power and apparent power are respectively represented by _________.

Which among the following happens in a low power factor?

Lower power factor is usually not due to ____________.

For a consumer what is the most economical power factor?

The primary reason for the low power factor is due to the installation of

For which among the following consumers is penalty imposed for low power factor?

Power factor can be improved by connecting which among these?

What is the advantage of the static capacitors?

Which among these is the advantage of synchronous condensers?

Phase advancers are used for which among the following machines?

What is the main disadvantage of phase advancers?