Objective (MCQ) on Thermal Power Plant

The boiler commonly used in a thermal plant are__________________.

1. a) Water tube type
2. b) Fire tube
3. c) Both (a) & (b)
4. d) None of these

Ans: c. Both (a) & (b)

Water to the boiler is at________________.

1. a) Atmospheric pressure.
2. b) Slightly more than atmospheric pressure. c) More than steam pressure in the boiler
3. d) any pressure.

Ans: c. more than steam pressure in the boiler

What is the main advantage of the usage of high pressure boilers in a thermal plant?

1. a) Lower price
2. b) Increase in efficiency
3. c) Low grade fuel can be burnt.
4. d) Both (b) and (c)

Ans: d. Both (b) and (c)

The major content of coal in India is ________________.

1. a) Dust
2. b) Ash
3. c) Fly ash
4. d) Cinder

Ans: b. Ash

Which of the following is the essential element for the combustion of fuel?

1. a) Oxygen
2. b) Correct fuel air ratio
3. c) Proper ignition temperature.
4. d) All of these.

Ans: d. All of these.

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.

1. b) The ratio of heat of combustion of coal to the heat equivalent of electrical output.
2. c) The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.
3. d) The ratio of heat of combustion of coal to the heat equivalent of mechanical energy transmitted to the turbine shaft

Ans: c. The ratio of heat equivalent of mechanical energy transmitted to the turbine shaft to the heat of combustion of coal.

Which of the following is a type of Gas Turbine Plant?

1. a) Single Acting
2. b) Double Acting
3. c) Open
4. d) None of the mentioned

Ans: c) Open

A Gas Turbine is which type of combustion plant?

1. a) External
2. b) open
3. c) internal
4. d) cannot say

Ans: c) internal

Which among these is the main component of a gas turbine plant?

1. a) Condenser
2. b) Compressor
3. c) Boiler
4. d) Both Compressor & Boiler

Ans: b) Compressor

Which type of compressor is used in a gas turbine plant?

1. a) Reciprocating compressor
2. b) Screw compressor
3. c) Multistage axial flow compressor
4. d) Either Reciprocating compressor & Screw compressor

Ans: c) Multistage axial flow compressor

The gas turbine power plant mainly uses which among the following fuels?

1. a) Coal and Peat
2. b) Kerosene oil and diesel oil and residual oil
3. c) Gas oil
4. d) Natural gas and liquid petroleum fuel

Ans: d) Natural gas and liquid petroleum fuel

Gas turbine power plant is…….efficient than steam turbine plant

a).More

b)Less

c)Same

d)None of the above

Ans a).More

 A fuel of cetane number 40 has the same ignition quality as a mixture of __________

1. a) 40% alpha methyl napthalene and 60% cetane
2. b) 40% cetane and 60% alpha methyl naphthalene
3. c) 40% petrol and 60% diesel d) 40% diesel and 60% petrol

Ans: b) 40% cetane and 60% alpha methyl naphthalene

In petrol engines, the delay period is of the order of __________

1. a) 0.001 sec b) 0.002 sec
2. c) 0.003 sec
3. d) 0.004 sec

Ans: b) 0.002 sec

Which material is most commonly used for shielding?

1. a) Carbon b) Concrete
2. c) Lead
3. d) All of the mentioned

Ans: c) Lead

What is the purpose of testing an internal combustion engine?

1. a) to conform the data used in design, the validity of which may be doubtful
2. b) to satisfy the customer regarding the performance of the engine
3. c) to determine the information, which cannot be obtained by calculations
4. d) all of the mentioned

Ans: d) all of the mentioned

A diesel engine is __________ as compared to petrol engine, both running at rated load.

1. a) Equally efficient b) more efficient
2. c) less efficient
3. d) all of the mentioned

Ans: b) more efficient

Which of the following statement is correct?

1. a) Compression ratio for petrol engines varies from 6 to 10
2. b) Petrol engines work on Otto cycle
3. c) Higher compression ratio in diesel engines results in higher pressures
4. d) All of the mentioned

Ans d) All of the mentioned

Power loss is important for the design of

1. a) Generator
2. b) Motor
3. c) Feeder
4. d) Transmission line

Ans: d) Transmission line

Alternative source of energy should be utilized such that

1. a) Fuel used is maximum
2. b) Generation is maximum
3. c) Efficient plant should be loaded to maximum
4. d) Production cost is minimized

Ans: d) Production cost is minimized

To improve the overall efficiency of thermal plant

1. a) Boiler pressure is decreased
2. b) Load on the units is decreased
3. c) Initial pressure and temperature and exhaust pressure and temperature are at maximum
4. d) Additional fuel is used

Ans d) Additional fuel is used

Which of the following has highest capital cost?

1. a) Thermal plant
2. b) Hydro plant
3. c) Diesel plant
4. d) Nuclear plant

Ans: d) Nuclear plant

Transfer of power between two power systems take place with power flowing from the system with the

1. a) Leading power factor
2. b) Lagging power factor
3. c) Higher voltage level
4. d) None of these

Ans: a) Leading power factor

For conventional power plants, running cost is minimum for

1. a) Thermal plant
2. b) Nuclear plant
3. c) Hydro plant d) Diesel plant

Ans c) Hydro plant

If fuel input increases, the load on thermal unit

1. a) Decreases
2. b) Increases
3. c) Remain same
4. d) Bears no relation

Ans: b) Increases

If load on the isolated generator is decreased without decreasing the power input to the prime mover speed of the generator

1. a) Remain unaltered
2. b) Decrease
3. c) Increase
4. d) Uncertain

Ans: c) Increase

In interconnected systems, each system

1. a) Should be seeded with frequency changes
2. b) Should depend on other for reserve capacity
3. c) Can provide its own reserve capacity
4. d) Should operate with flat frequency changes

Ans: c) Can provide its own reserve capacity

Speed control by governors of electric generating units normally have a/an

1. a) Increase of speed with increasing load
2. b) Decrease of speed with increasing load
3. c) Decrease of speed with decreasing load
4. d) Flat load characteristic

Ans: b) Decrease of speed with increasing load

Maximum power transferred through the interconnected is called

1. a) Maximum capacity
2. b) Percentage regulation
3. c) Synchronous capacity
4. d) None of these

Ans c) Synchronous capacity

Which of the following generation station has minimum running cost?

1. a) Thermal power station
2. b) Hydro-electric power station
3. c) Nuclear power station
4. d) None of these

Ans: b) Hydro-electric power station

Out of the following which one is not a unconventional source of energy ?

1. a) Tidal power
2. b) Geothermal energy
3. c) Nuclear energy
4. d) Wind power

Ans: C) Nuclear energy

Standard frequency usually for electric supply is

1. a) 50 Hz
2. b) 60 Hz
3. c) 50 to 60 Hz
4. d) 50 to 55 Hz.

Ans: A) 50 Hz

Which of the following is usually not the generating voltage?

6. a) 6.6 KV
7. b) 8.8 KV
8. c) 11 KV
9. d) 13.2 KV

Ans: B) 50 Hz

The overall efficiency of the thermal plant is low due to low efficiency of

1. a) Boiler
2. b) Alternator
3. c) steam turbine and condenser
4. d) Non salient pole rotor

Ans: B) 50 Hz

Overall thermal efficiency of steam power station is in the range.

1. A) 18-24 %
2. B) 30-40 %
3. C) 44-62%
4. D) 68.79%

Ans: B) 30-40 %

India’s first Nuclear power plant was installed?

1. A) Tarapore
2. B) Kota
3. C) Kalpakam

D)Nagpu

The function of the moderator in a nuclear reactor is to

1. A) Stop chain reaction
2. B) Reduce the speed of Neutrons

Ans: b) Reduce the speed of Neutrons

Fuel transportation cost is least in?

1. A) Diesel generating plant
2. B) Steam power station
3. C) Nuclear power plant.

Ans: a) Diesel generating plant

Coolant used in reactors is.

1. A) Air
2. B) Heavy water
3. C) Liquid metal
4. D) Graphite

Ans: a) Diesel generating plant

Commonly used atomic fuels are

1. A) Uranium, U-235
2. B) Plutonium, PU-239
3. C) Thorium, TH-232
4. D) All of these

Ans: A)Uranium, U-235

Energy produce in nuclear reactor is generally by?

1. A) Fission
2. B) Fusion
3. C) both
4. D) None of the above

Ans: c) Both

Heavy water is?

1. A) H2O
2. B) D2O
3. C) O2
4. D) s2

Ans: a) H2O