Q.1
Nuclear reactors are used
  • to produce heat for thermoelectric power
  • to produce fissionable material
  • to propel ships, submarines, aircrafts
  • all of these
Q.2
The exhaust valve in a four stroke cycle petrol engine
  • opens at 50° before bottom dead centre and closes at 15° after top dead centre
  • opens at bottom dead centre and closes at top dead centre
  • opens at 50° after bottom dead centre and closes at 15° before top dead centre
  • may open and close anywhere
Q.3
The predominent isotope of the naturally occuring element is
  • U235
  • U238
  • Pu233
  • Pu239
Q.4
A moderator generally used in nuclear power plants is
  • graphite
  • heavy water
  • concrete
  • graphite and concrete
Q.5
The primary fuel used in nuclear power plants is
  • U235
  • U238
  • Pu239
  • Pu233
Q.6
In a four stroke cycle petrol engine, the compression
  • Starts at 40° after bottom dead centre and ends at 30° before top dead centre
  • Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre
  • Starts at bottom dead centre and ends at top dead centre
  • May start and end anywhere
Q.7
In compression ignition engines, swirl denotes a
  • Haphazard motion of the gases in the chamber
  • Rotary motion of the gases in the chamber
  • Radial motion of the gases in the chamber
  • None of the above
Q.8
Fuel oil consumption guarantees for I .C. engine are usually based on
  • Low heat value of oil
  • High heat value of oil
  • Net calorific value of oil
  • Calorific value of fuel
Q.9
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be
  • Higher
  • Lower
  • Remain unaffected
  • None of the above
Q.10
In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.
  • Agree
  • Disagree
Q.11
Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to
  • cylinder walls being too hot
  • overheated spark plug points
  • red hot carbon deposits on cylinder walls
  • any one of these
Q.12
The expansion of fuel in a four stroke cycle diesel engine
  • starts at 15° before top dead centre and ends at 30° after top dead centre
  • starts at top dead centre and ends at 30° after top dead centre
  • starts at 15° after top dead centre and ends at 30° before bottom dead centre
  • may start and end anywhere
Q.13
In a diesel engine, the duration between the time of injection and ignition, is known as
  • pre-ignition period
  • delay period
  • period of ignition
  • burning period
Q.14
Reactors for propulsion applications are designed for
  • any form of uranium
  • natura uranium
  • enriched uranium
  • plutonium
Q.15
In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.
  • True
  • False
Q.16
Each fission of Uproduces on the average __________ fast neutrons as a product of reaction.
  • 2.46
  • 24.6
  • 246
  • 2460
Q.17
The pressure at the end of compression in the case of diesel engine is of the order of
  • 12 kg/cm
  • 35 kg/cm
  • 20 kg/cm
  • 6 kg/cm
Q.18
The air standard efficiency of an I.C. engine depends on (A) Fuel used
  • Compression ratio
  • Fuel used
  • Speed of engine
  • None of these
Q.19
The ratio of the indicated thermal efficiency to the air standard efficiency is known as
  • Volumetric efficiency
  • Relative efficiency
  • Overall efficiency
  • Mechanical efficiency
Q.20
The compression ignition engines are governed by
  • Qualitative governing
  • Hit and miss governing
  • Quantitative governing
  • None of these
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