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.

251.

Direct conversion of heat energy into electrical energy is possible through
A. MHD generators
B. Fuel or solar cells
C. Thermionic converters
D. Both (a) and (c)
E. None of these
Answer» E. None of these
Discussion
252.

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» C. A plot of load vs duration of time.
Discussion
253.

In geo thermal power plants waste water is
A. Discharged back to earth.
B. Discharged into the sea.
C. Recirculated after cooling in cooling towers.
D. Evaporated in ponds.
Answer» B. Discharged into the sea.
Discussion
254.

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» E.
Discussion
255.

What is the shape of the load duration curve?
A. Rectangular shape
B. Triangular shape
C. Parabolic shape
D. Free hand sketch
Answer» B. Triangular shape
Discussion
256.

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» C. Always more than unity
Discussion
257.

What is a load 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» B. The ratio of maximum demand to average load.
Discussion
258.

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» C. The number of hours for which a particular lasts during the day
Discussion
259.

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» C. Overall demand
Discussion
260.

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» C. The ratio of actual energy produced to the maximum possible energy.
Discussion
261.

A thermal generating station has a installed capacity of 15 MW and supplies a daily load 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» E.
Discussion
262.

Diversity factor is helpful in computing which of the following factors?
A. Plant capacity
B. Average load
C. Units generated (kWh)
D. Peak demand
Answer» B. Average load
Discussion
263.

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» C. Only load factor increases.
Discussion
264.

A large diversity factor of the load in a power system
A. Reduces the installation cost.
B. Increases the installation cost.
C. Does not affect the installation cost.
D. None of the above
Answer» B. Increases the installation cost.
Discussion
265.

What is operating value of diversity factor?
A. Greater than unity
B. Less than unity
C. Always more than unity
D. Normally more than unity
Answer» B. Less than unity
Discussion
266.

Maximum demand on the power system is
A. Sum of the maximum demands of all its consumers.
B. Greatest average load in a specified time.
C. Peak value of load in a specified time.
D. All of the above.
Answer» C. Peak value of load in a specified time.
Discussion
267.

What is the result of the product of diversity factor and maximum demand?
A. Average demand
B. Sum of consumers maximum demand
C. Installed capacity
D. Generated power
Answer» C. Installed capacity
Discussion
268.

What is demand factor?
A. Average load to maximum demand.
B. Maximum demand to connected load.
C. Connected load to maximum demand.
D. Maximum demand to average load.
Answer» C. Connected load to maximum demand.
Discussion
269.

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» C. Always more than unity.
Discussion
270.

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 of maximum demand on the power station to the connected load.
Answer» D. The ratio of maximum demand on the power station to the connected load.
Discussion
271.

Which among these plants are most efficient?
A. Open cycle
B. Combined cycle
C. Closed cycle
D. None of these
Answer» C. Closed cycle
Discussion
272.

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» B. Connected load
Discussion
273.

Capacity factor will be very low when the power plant _________________.
A. is operated as base load plant.
B. is operated for supplying base load as well as the peak loads.
C. is operated in emergency only.
D. is under maintainance.
Answer» D. is under maintainance.
Discussion
274.

Coal is processed and burnt in the combustor of a hybrid MHD at a high temperature and pressure with the preheated air to form which among the following element?
A. Steam
B. Plasma
C. Coke
D. None of these
Answer» C. Coke
Discussion
275.

What does the highest point on the daily load curve represent?
A. Peak load
B. Maximum demand
C. Both (a) & (d)
D. None of these
Answer» C. Both (a) & (d)
Discussion
276.

Load curve of a generation is always
A. Positive slope
B. Zero slope
C. Negative slope
D. Combination of (a), (b) and (c)
Answer» E.
Discussion
277.

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» D. None of these
Discussion
278.

The mass curve is plotted from which of the following curve?
A. Chronological curve
B. Energy load curve
C. Load duration curve
D. None of these
Answer» D. None of these
Discussion
279.

The potential of developing tidal power in India is in
A. Kutch
B. Ran
C. San joe
D. Severn
Answer» B. Ran
Discussion
280.

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» B. Huge capacity and low construction time.
Discussion
281.

Which of the following liquid metal is not used as a magneto hydrodynamic generation (MHD) working fluid?
A. Potassium
B. Sodium
C. Lithium
D. All of these
Answer» C. Lithium
Discussion
282.

Pugga valley in Ladakh is suitable for which among the following power generation?
A. Solar
B. Geo thermal
C. Wind
D. None of these
Answer» C. Wind
Discussion
283.

The harmful emissions such as sulphur are removed from gas before it is discharged to the atmosphere through which instrument?
A. Duct
B. Mufflers
C. Stark
D. All of these
Answer» D. All of these
Discussion
284.

The nature of the current developed in MHD generator is
A. AC
B. DC
C. Both (a) and (b)
D. None of these
Answer» C. Both (a) and (b)
Discussion
285.

Economiser is used to heat_____________?
A. air
B. feed water
C. flue gases
D. all above
Answer» C. flue gases
Discussion
286.

Heating value of diesel is around _________.
A. 4000 kcal/kg
B. 10000 kcal/kg
C. 15000 kcal/kg
D. 20000 kcal/kg
Answer» C. 15000 kcal/kg
Discussion
287.

The temperature of the cooling water leaving the diesel engine should not exceed.
A. 25 °C
B. 40 °C
C. 85 °C
D. 70 °C
Answer» C. 85 °C
Discussion
288.

The efficiency of the solar cell is about
A. 25 %
B. 15 %
C. 40 %
D. 60 %
Answer» C. 40 %
Discussion
289.

The output of the solar cell is of the order
A. 0.5 W
B. 1.0 W
C. 5.0 W
D. 10.25 W
Answer» C. 5.0 W
Discussion
290.

For satellites the source of energy is
A. Solar cell
B. Fuel cells
C. Edison cells
D. Cryogenic storage
Answer» B. Fuel cells
Discussion
291.

Calculate the overall efficiency of the diesel plant if the fuel consumption is 0.24 kg per kWh and the calorific value of the fuel being 10000 kcal/kg.
A. 30.78
B. 35.83
C. 28.73
D. 36.86
Answer» C. 28.73
Discussion
292.

In a fuel cell, cathode is of
A. Oxygen
B. Ammonia
C. Hydrogen
D. Carbon monoxide
Answer» D. Carbon monoxide
Discussion
293.

The proper indication of incomplete combustion is_______________?
A. high CO content in flue gases at exit
B. high CO2 content in flue gases at exit
C. high temperature of flue gases
D. the smoking exhaust from chimney
Answer» B. high CO2 content in flue gases at exit
Discussion
294.

The lubrication cost in a diesel power plant is _______.
A. High
B. Low
C. Moderate
D. Very low
Answer» B. Low
Discussion
295.

The commercial sources of energy are____________?
A. solar, wind and biomass
B. fossil fuels, hydropower and nuclear energy
C. wood, animal wastes and agriculture wastes
D. none of the above
Answer» C. wood, animal wastes and agriculture wastes
Discussion
296.

The percentage O2 by Weight in atmospheric air is____________?
A. 18%
B. 23%
C. 77%
D. 79%
Answer» C. 77%
Discussion
297.

What is regeneration?
A. Removal of heat from compressed air between stages of compression.
B. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber.
C. To increase the temperature of partially expanded gases by burning more fuel.
D. None of these
Answer» C. To increase the temperature of partially expanded gases by burning more fuel.
Discussion
298.

What is meant by inter cooling?
A. Removal of heat from compressed air between stages of compression.
B. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber.
C. To increase the temperature of partially expanded gases by burning more fuel.
D. None of the above
Answer» B. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber.
Discussion
299.

Which material is used for the manufacture of the turbine blades?
A. Stainless steel
B. Carbon steel
C. High nickel alloy
D. High alloy steel
Answer» D. High alloy steel
Discussion
300.

Solar thermal power generation can be achieved by_______________?
A. using focusing collector or heliostates
B. using flat plate collectors
C. using a solar pond
D. any of the above system
Answer» E.
Discussion