MCQs ON UNIT 1 & UNIT II FOR SE PGT ONLINE EXAMINATION

Topic: steam and nuclear power plant

Marks 1
Question Commercial source of energy are

A Fossil fuel, water and radioactive substances

Marks 1
Question The overall efficiency of thermal power station is equal to

A that of rankine cycle

C that of binary vapor cycle

D product of boiler efficiency, turbine efficiency and generator efficiency

Answer D
Marks 1
Question Coal used in thermal power plant is known as
A Soft coal
B Steam coal
C Charcoal
D Coke
Answer b

Marks 1
Question In the nuclear fission reaction , isotope of uranium used id
A U235
B U234
C U233
D U238
Answer C

Marks 1
Question When nuclear reactor is operating at constant power multiplier factor
A is equal to unity
B is less than unity
C is greater than unity
D may be one of the above
Answer A
Marks 1
Question Large size steam power plant and nuclear plants are suitable for
A peak loads
B intermediate loads
C base loads
D both base load and peak load
Answer C

Marks 1
Question The efficiency of unclear power plant is less than that of a conventional fuel fired thermal
plant because of
A less rejection of heat in condenser
B higher temperature conditions
C higher pressure conditions
D low temperature and pressure conditions
Answer D

Marks 1
Question In forced draught main function of chimney is to
A discharge gases high up in the atmosphere from the point of view of air pollution
B accelerate the fuel combustion
C reduce the temperature of the discharged hot gases.
D All of the above
Answer A
Marks 1
Question The feed water treatment is mainly to avoid
A embitterment problem
B carry over problem
C corrosion and scale formation problem
D all of above problem
Answer D

Marks 1
Question The function of moderator in nuclear reactor is
A to absorb the excess neutrons
B to increase energy of neutrons
C to slow down neutrons
D all of above.
Answer C

Marks 1
Question In a nuclear reactor chain reaction is controlled by
A iron rods
B Cadmium rods
C Graphite rod
D Brass rod
Answer B

Marks 1
Question In a boiler water reactor (BWR)
A the feed water acts both coolant and a moderator
B enriched uranium
C there is a danger of radioactive contamination of steam
D all of the above
Answer D

Marks 1
Question The function of reflector in nuclear reactor is to
A bounce back most of the neutrons that escape from the fuel core
B reduce the speed of neutrons
C stop the chain reaction
D all of the above
Answer A

Marks 1
Question Heay water used in nuclear power plant as
A fuel
B coolant
C shield
D both b and c

Answer D

Marks 1
Question Artificial draught is produced by
A a forced fan
B an induced fan
C induced and forced fan
D all of the above
Answer D

Marks 1
Question Pulverized coal is used for
A better burning
B increased calorific value of coal
C less radiation loss
D medium size unit
Answer A

Marks 1
Question Low grades coal have
A low carbon content
B low calorific value
C low moisture content
D low ash content
Answer B

Marks 1
Question Ash content of coal can be reduced by
A Pulverizing
B washing
C slow burning
D mixing with high grade coal
Answer B

Marks 1
Question
Gas cooled reactor
A Uses CO2 or helium as coolant and graphite as moderator
B use coolant at pressure of 14-28kg/cm2 and at temperature of 700-800C
C use heavy water as a coolant as well as moderator
D both (a) and (b)
Answer D

Marks 1
Question a gas turbine works on
A Carnot cycle
B Regenerative cycle
C Rankine cycle
D dual cycle
Answer B

Marks 1
Question The height of chimney in a steam power station is governed by
A the draught to be produced
B the quantity of flew gases being produced
C pollution controlled
D all of the above
Answer A

Marks 1
Question Economiser in a steam power plant
A improvers the boiler efficiency by 10-12%
B saves fuel consumption by 5-15%
C becomes a necessity for pressure exceeding 70kg/cm2
D all of the above
Answer D

Marks 1
Question A condenser in a steam power plant condenses steam coming out of

A turbine
B boiler
C economizer
D superheater
Answer A

Marks 1
Question The purpose of boiler feed pump is to
A pump hot air into boiler

B pump pulverized coal into boiler

C pump out steam from boiler

D none of the above

A induced fan and chimney

B air preheater and induced fan

C economizer and air preheater

D boiler furnace and economizer

Answer B

Marks 1
Question Live storage of coal in power plant means
A a covered storage near the boiler furnace having coal sufficient to meet 24 hrs demand of
the power plant
B . coal in transit
C coal ready for combustion

D storage of coal sufficient to meet one week demand of the plant radially
Answer A

Marks 1
Question Dust can be separated from gas by
A sudden velocity decreases owing to enlargement
B abrupt changes of flow direction
C impingement upon small baffles
D all of the above

Answer D
Marks 1
Question The power output of nuclear power station is proportional to
A The rate at which fission reaction occurs
B Square root of the reaction at which fission reaction occurs
C Square of the rate at which fission reaction occurs
D None of the

Answer Ans. A

1 1
Question A CANDU reactor uses
A Highly enriched uranium as a fuel and light water as a moderator and coolant
B natural uranium as a fuel and heavy water as a moderator and coolant
C enriched uranium as a fuel and ordinary water as a moderator an coolant
D only fertile material
Answer B

Marks 1
Question Which of the following can not be used as a moderator
A Deuterium
B Graphite
C Heavy water
D Beryllium
Answer A

Marks 1
Question The main drawback of gas turbine power plant are
A low overall efficiency , noisy operation and limited unit capacity
B inability of using coal or heavy residual petroleum as a fuel
C high initial cost , poor reliability and large space requirement
D both (a) and (b
Answer D

Marks 1
Question Air filter is used in
A steam power plant
B nuclear power plant
C hydro power plat
D diesel power plant
Answer D

Marks 1
Question A sodium graphite reactor uses
A sodium as a moderator and graphite as a coolant
B sodium as a coolant and graphite as a moderator
C A mixture of sodium and graphite as a coolant
D A mixture of sodium and graphite as a moderator
Answer B

Marks 1
Question Which of the following statement is true

A Diesel power plant employ only four stroke engine

C A two stroke engine develops more power for same speed and piston displacement

D The specific fuel consumption of a diesel power plant decreases with increase in load
Answer C

Marks 1
Question Control rods used in nuclear reactor are made u of
A Zirconium
B Boron
C Beryllium
D Lead
Answer B

Marks 1
Question Rankine cycle consist of
A Two constant pressure and two constant volume processes
B Two constant pressure and two isentropic processes
C Two constant pressure and two isothermal processes
D None of the above
Answer B

Marks 1
Question Work ratio of rankine cycle as compared to carnot cycle is
A Less
B More
C Equal
D Cannot predict
Answer B

Marks 1
Question The power plant which are used for generation of power by industries for personnel use is
called
A Steam power station
B Central power station
C Captive power station
D Either of the above
Answer C

Marks 1
Question A closed vessel in which steam is produced from water by combination of fuel is called
A Steam generator
B Boiler
C Either (a) or (b)
D None of the above
Answer C

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Marks 41
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Marks 50
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