Q.1
It the temperature of intake air in IC engines is lowered, then its efficiency will
  • Decrease
  • Increase
  • Remain same
  • Increase up to certain limit and then decrease
Q.2
The probability of knocking in diesel engines is increased by -
  • High self ignition temperature
  • Low volatility
  • Higher viscosity
  • All of these
Q.3
The ignition quality of petrol is expressed by -
  • Octane number
  • Cetane number
  • Calorific value
  • All of these
Q.4
In a four stroke cycle petrol engine, the inlet valve
  • Opens at top dead center and closes at bottom dead center
  • Opens at 20° before top dead center and closes at 40° after bottom dead center
  • Opens at 20° after top dead center and closes at 20° before bottom dead center
  • May open or close anywhere
Q.5
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed
  • 80°C
  • 120°C
  • 180°C
  • 240°C
Q.6
The secondary fuel used in nuclear power plants is
  • U233 and Pu239
  • U235 and Th232
  • U235 and Pu238
  • U233 and Pu238
Q.7
The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
  • Morse test
  • Prony brake test
  • Motoring test
  • Heat balance test
Q.8
The thermal efficiency of a petrol engine is _________ as compared to diesel engine.
  • Less
  • Same
  • More
  • None of these
Q.9
The maximum temperature in the I.C. engine cylinder is of the order of -
  • 2000-2500°C
  • 1500-2000°C
  • 1000-1500°C
  • 500-1000°C
Q.10
Scavenging air in diesel engine means
  • Forced air for cooling cylinder
  • Air used for combustion sent under pressure
  • Burnt air containing products of combustion
  • Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Q.11
The knocking tendency in compression ignition engines for a given fuel will be
  • Enhanced by increasing compression ratio
  • Enhanced by decreasing compression ratio
  • Dependent on other factors
  • None of the above
Q.12
The process of breaking up or a liquid into fine droplets by spraying is called
  • Carburetion
  • Atomization
  • Ionization
  • Vaporisation
Q.13
High speed compression engines operate on
  • Otto cycle
  • Diesel cycle
  • Dual-combustion cycle
  • all of these
Q.14
The injection pressure in a diesel engine is about
  • 10 bar
  • 100 bar
  • 150 bar
  • 500 bar
Q.15
In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,
  • Agree
  • Disagree
Q.16
The basic requirement of a good combustion chamber is
  • minimum turbulence
  • low compression ratio
  • high thermal efficiency and power output
  • low volumetric efficiency
Q.17
The energy released during the fission of one atom of Uranium -in million electron volts is about
  • 100
  • 200
  • 300
  • 400
Q.18
The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.
  • Agree
  • Disagree
Q.19
The detonation is also called knocking or pinking.
  • Yes
  • No
Q.20
Uis produced
  • artificially
  • as basic raw material
  • when thorium is irradiated by neutrons
  • by fission of U238
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