Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 302 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

At low value of power factor, the cost of generation of a power station will be____________?
A. high
B. low
C. remain same
D. none of the above
Answer» B. low
Discussion
2.

The value of the reheat factor is of the order of_____________?
A. 0.8 to 1.0
B. 1.0 to 1.05
C. 1.1 to 1.5
D. above 1.5
Answer» D. above 1.5
Discussion
3.

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» B. Right and Left.
Discussion
4.

Presence of non – condensable gasses in a geo - pressured water causes
A. Pollution problem
B. Corrosion problem
C. Flow problem
D. All of the above
Answer» E.
Discussion
5.

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
6.

Secondary air is the air used to______________?
A. reduce the flame length
B. increase the flame length
C. transport and dry the coal
D. provide air round the burners for getting optimum combustion
Answer» E.
Discussion
7.

Caking coals are those which__________?
A. burn completely
B. burn freely
C. do not form ash
D. form lumps or masses of coke
Answer» E.
Discussion
8.

A steam power stations basically work on the______________?
A. thermodynamic cycle
B. Rankin cycle
C. Vapor pressure cycle
D. Carton cycle
Answer» C. Vapor pressure cycle
Discussion
9.

Which state in India among these doesn’t have a gas turbine plant?
A. Jammu Kashmir
B. Tripura
C. Tamil Nadu
D. Bihar
Answer» D. Bihar
Discussion
10.

Which of the following power plant usually offer highest maintenance cost___________?
A. Nuclear power plants
B. Hydro-electric power plants
C. Thermal power plants
D. Diesel engine power plant
Answer» D. Diesel engine power plant
Discussion
11.

Which of the following Power Plant causes least environmental pollution____________?
A. Thermal Power Plant
B. Hydro Power Plant
C. Nuclear Power Plant
D. Diesel Power Plant
Answer» C. Nuclear Power Plant
Discussion
12.

Which of the following power plant has least efficiency_________?
A. Nuclear power plant
B. Hydro power plant
C. Steam power plant
D. Diesel power plant
Answer» D. Diesel power plant
Discussion
13.

The pipes carrying the steam are made of _________.
A. Steel
B. Cast iron
C. Aluminium
D. Cobalt
Answer» B. Cast iron
Discussion
14.

The overall efficiency of a steam power station is ________ its thermal efficiency.
A. less than
B. equal to
C. greater than
D. none of the above
Answer» B. equal to
Discussion
15.

A gas turbine basically work on
A. Carnot cycle
B. Rankin cycle
C. Brayton cycle
D. Dual cycle
Answer» D. Dual cycle
Discussion
16.

Diesel power plant are generally used as___________?
A. peak load plant
B. base load plant
C. standby plant
D. none of the above
Answer» B. base load plant
Discussion
17.

Which of the following is usually not the generating voltage__________?
A. 6.6 kV
B. 9.9 kV
C. 11kV
D. 13.2kV
Answer» C. 11kV
Discussion
18.

If the diversity factor of a power station is high then its generation cost is___________?
A. high
B. low
C. remain same
D. depend on the plan type
Answer» C. remain same
Discussion
19.

The ideal load factor should be_____________?
A. unity
B. zero
C. negative
D. infinity
Answer» B. zero
Discussion
20.

The use of air preheater increase the temp of the air by about______________.
A. 50°
B. 20°
C. 5°
D. 30°
Answer» C. 5°
Discussion
21.

A 100 MW steam station uses coal of calorific value of 5780 kcal/kg. The thermal efficiency is about 30% and the electrical efficiency is 93%. What would be the coal consumption per hour, when the station is delivering its full rated output?
A. 48672 kg
B. 53330 kg
C. 71876 kg
D. 31826 kg
Answer» C. 71876 kg
Discussion
22.

Turbo alternators run at speeds
A. Constant speed of 3000 rpm.
B. Constant speed of 1000 rpm.
C. A variable speed of above 1000 rpm.
D. None of the above
Answer» D. None of the above
Discussion
23.

On which cycle does the gas turbine work?
A. Carnot
B. Brayton
C. Dual cycle
D. Rankine cycle
Answer» C. Dual cycle
Discussion
24.

A steam turbine with no nozzle is ________________.
A. Reaction turbine
B. Impulse turbine
C. Both (a) and (b)
D. None of these
Answer» B. Impulse turbine
Discussion
25.

The governing principle of steam turbines are ________________.
A. Nozzle control governing
B. Throttle governing
C. Bypass governing
D. All of these
Answer» E.
Discussion
26.

Air- preheater in a steam power plant_____________.
A. Recovers the heat from the flue gases leaving the economiser.
B. Improves combustion rate.
C. Raises the temperature of the furnace gases
D. All of these.
Answer» E.
Discussion
27.

The reheat factor in a steam turbine depends on
A. Stage efficiency
B. Initial pressure and temperature
C. Exit pressure
D. All of the above
Answer» E.
Discussion
28.

What is the superior quality of coal called?
A. Anthracite
B. Coke
C. Bituminous
D. Peat
Answer» D. Peat
Discussion
29.

What percent of installed capacity of gas turbines contribute to the total installed capacity of the power plants in India?
A. 5 %
B. 8 %
C. 11 %
D. 15 %
Answer» D. 15 %
Discussion
30.

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» D. Carbon, nitrogen and ash.
Discussion
31.

The gas turbines are mainly used in ________.
A. Locomotives
B. Aircrafts
C. Automobiles
D. Pumping stations
Answer» D. Pumping stations
Discussion
32.

Gas turbine plants are not used ___________.
A. as peak load plants.
B. as base load plants.
C. as standby power plants.
D. in combination with the steam power plants
Answer» C. as standby power plants.
Discussion
33.

Which of the following is/are an/ the essential element/s for the combustion of fuel?
A. Oxygen
B. Correct fuel air ratio.
C. Proper ignition temperature.
D. All of these.
Answer» E.
Discussion
34.

Name the turbine developed on the basis of aircraft engine technology.
A. Brayton
B. Aerodynamic
C. Aero derivative
D. Rankine
Answer» D. Rankine
Discussion
35.

Combined cycle power plants are suitable for ___________.
A. Base loads.
B. Peak loads.
C. Intermediate loads.
D. Both base and peak loads.
Answer» E.
Discussion
36.

Water used in the steam plant is used for cooling in_______________.
A. Condenser
B. Turbine only
C. Boiler tube
D. Boiler tubes and turbines
Answer» B. Turbine only
Discussion
37.

What is the percentage of ash content in Indian coal?
A. 5 %
B. 10 %
C. 20 %
D. 30 %
Answer» D. 30 %
Discussion
38.

The definition of the draught system is
A. A device used to pull in air.
B. The difference between absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure.
C. The sum of the absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure.
D. A device used to pull out air.
Answer» C. The sum of the absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure.
Discussion
39.

Spray ponds are used to cool the warm water coming from the condenser in ________.
A. Large power plants
B. Small power plants
C. Medium power plants
D. Both medium and large power plants.
Answer» C. Medium power plants
Discussion
40.

What is the overall efficiency of the thermal plant?
A. The ratio of heat equivalent of electrical output to the heat of combustion of coal.
B. The ratio of heat of combustion of coal to the heat equivalent of electrical output.
C. The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.
D. The ratio of heat of combustion of coal to the heat equivalent of mechanical energy transmitted to the turbine shaft.
Answer» B. The ratio of heat of combustion of coal to the heat equivalent of electrical output.
Discussion
41.

What is the important factor in fuel selection?
A. Cost of fuel.
B. Calorific value
C. Both (a) & (b)
D. None of these
Answer» D. None of these
Discussion
42.

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» D. Coal which burns for long time.
Discussion
43.

Why is pulverised coal used?
A. Better burning.
B. Increased calorific value of coal.
C. Medium size units.
D. Less radiation loss.
Answer» B. Increased calorific value of coal.
Discussion
44.

Ash handling system is mainly divided into________________ systems.
A. Mechanical handling
B. Pneumatic
C. Hydraulic
D. All of these
Answer» E.
Discussion
45.

The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?
A. 0.6
B. 0.578
C. 0.555
D. 0.5457
Answer» C. 0.555
Discussion
46.

The thermal efficiency of a steam plant is defined as ________________.
A. The ratio of heat equivalent of electrical output to the heat of combustion of coal.
B. The ratio of heat of combustion of coal to the heat equivalent of electrical output.
C. The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.
D. The ratio of heat of combustion of coal to the heat equivalent of mechanical energy transmitted to the turbine shaft.
Answer» D. The ratio of heat of combustion of coal to the heat equivalent of mechanical energy transmitted to the turbine shaft.
Discussion
47.

Evaporative type of condenser has
A. Water in pipes surrounded by steam outside.
B. Steam and cooling water mixed to give the condensate.
C. Steam in pipes surrounded by water.
D. None of the above.
Answer» D. None of the above.
Discussion
48.

What is use of the air pumps in the condenser?
A. Remove water
B. Air leaking in the condenser and to maintain the vacuum
C. Maintain atmospheric pressure and the condenser
D. Both (a) & (b)
Answer» C. Maintain atmospheric pressure and the condenser
Discussion
49.

The best coal suitable for the production of energy is_________________.
A. Lignite
B. Bituminous
C. Anthracite
D. Peat
Answer» D. Peat
Discussion
50.

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» B. Hydraulic
Discussion