Q.1

The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.

  • increase
  • decrease
Q.2

Uranium has isotopes

  • U234
  • U235
  • U238
  • all of these
Q.3

The cetane (C16H34) which is a straight chain paraffin is assigned a cetane number of

  • 0
  • 50
  • 100
  • 120
Q.4

The voltage required to produce a spark across the gap, between the sparking points is

  • 2000 to 4000 volts
  • 4000 to 6000 volts
  • 6000 to 10 000 volts
  • 10 000 to 12 000 volts
Q.5

The ignition quality of diesel oil is expressed by

  • cetane number
  • octane number
  • calorific value
  • none of these
Q.6

The injection of fuel by external source is not required in case of engines working on Otto cycle.

  • Yes
  • No
Q.7

During idling, a petrol engine requires __________ mixture.

  • lean
  • rich
  • chemically correct
Q.8

A petrol engine, during suction stroke draws

  • air only
  • petrol only
  • a mixture of petrol and air
Q.9

The engines in which the combustion of fuel takes place inside the engine cylinder are called internal combustion engines.

  • True
  • False
Q.10

Which of the following statement is correct regarding normal cetaine?

  • It is a standard fuel used for knock rating of diesel engines.
  • Its chemical name is normal-hexadecane.
  • It has long carbon chain structure.
  • all ofthe above
Q.11

A fuel of cetane numberhas the same ignition quality as a mixture of

  • 40% cetane and 60% alpha methyl napthalene
  • 40% alpha methyl napthalene and 60% cetane
  • 40% petrol and 60% diesel
  • 40% diesel and 60% petrol
Q.12

The maximum propulsive efficiency of a turbo-jet engine is at a speed of

  • 1000 km/h
  • 2000 km/h
  • 2400 km/h
  • 3000 km/h
Q.13

Reflector in nuclear power plants __________ neutron leakage.

  • increases
  • decreases
  • have no effect on
Q.14

Enriched uranium may contain fissionable contents from

  • 1 to 40%
  • 10 to 50%
  • 1 to 80%
  • 1 to 99%
Q.15

The inlet valve of a four stroke cycle internal combustion engine remains open for

  • 130°
  • 180°
  • 230°
  • 270°
Q.16

The increase in intake temperature of internal combustion engines will __________ efficiency.

  • have no effect on
  • increase
  • decrease
Q.17

The pressure at the end of compression, in petrol engines, is approximately

  • 10 bar
  • 20 bar
  • 25 bar
  • 35 bar
Q.18

The size of a reactor at which the chain reaction can be initiated (i.e. when system becomes critical) with just enough fissionable material (called critical mass of fuel) is known as critical size of reactor.

  • Correct
  • Incorrect
Q.19

The turbine of the turbo-prop engine is __________ that of the turbo-jet engine.

  • same as
  • smaller than
  • bigger than
Q.20

The knocking tendency in spark ignition engines may be decreased by

  • controlling the air-fuel mixture
  • controlling the ignition timing
  • controlling the exhaust temperature
  • reducing the compression ratio
Q.21

The colour of exhaust from diesel engine is generally

  • white
  • bluish
  • black
  • violent
Q.22

Morse test is used to determine the I.P. of a

  • single cylinder petrol engine
  • four stroke engine
  • single cylinder diesel engine
  • multi-cylinder engine
Q.23

The control rods in the control system of nuclear reactors are used to

  • absorb excess neutrons
  • control fuel consumption
  • control temperature
  • all of these
Q.24

In a four stroke cycle petrol engine, the expansion

  • starts at top dead centre and ends at bottom dead centre
  • starts at 30° before top dead centre and ends at 50° before bottom dead centre
  • starts at 30° after top dead centre and ends at 50° after bottom dead centre
  • may start and end anywhere
Q.25

The running cost of a petrol engine is __________ than that of a diesel engine.

  • higher
  • lower
Q.26

In natural uranium, the constituents of three naturally occuring isotopes are

  • U234 = 0.006%, U235 = 0.712% and U238 = 99.282%
  • U234 = 0.712%, U235 = 0.006% and U238 = 99.282%
  • U234 = 99.282%, U235 = 0.006% and U238 = 0.712%
  • U234 = 0.006%, U235 = 99.282% and U238 = 0.712%
Q.27

The cylinder of a gas engine is made __________ than that of the petrol engine.

  • smaller
  • larger
Q.28

A supercharged engine as compared to an ordinary engine

  • requires smaller foundation
  • is lighter
  • consumes less lubricating oil
  • all of these
Q.29

In petrol engines, using a fixed octane rating fuel, the increase in compression ratio will not effect the knocking tendency.

  • Agree
  • Disagree
Q.30

The first nuclear power plant in India was located at

  • Kota
  • Tarapur
  • Bareilly
  • none of these
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