Q.1

The correct mixture strength (by weight) for petrol is about

  • 14.6:1
  • 18.5:1
  • 20.4:1
  • 22.6:1
Q.2

The effective inhibitor of pre-ignition is

  • alcohol
  • water
  • lead
  • none of these
Q.3

Reactors for propulsion applications are designed for

  • any form of uranium
  • natura uranium
  • enriched uranium
  • plutonium
Q.4

The nuclear power station at Tarapur has the reactor of the __________ type.

  • pressurized water
  • boiling water
  • gas cooled
  • liquid metal cooled
Q.5

Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

  • heavy water
  • graphite
  • carbon dioxide
  • no moderator is needed
Q.6

The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

  • Agree
  • Disagree
Q.7

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.8

Nuclear reactors are used

  • to produce heat for thermoelectric power
  • to produce fissionable material
  • to propel ships, submarines, aircrafts
  • all of these
Q.9

The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.

  • equal to
  • below
  • above
Q.10

The knocking tendency in spark ignition engines can be decreased by adding dopes like tetra ethyle lead and ethylene dibromide.

  • Agree
  • Disagree
Q.11

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.12

A moderator

  • absorbs neutrons
  • does not absorb neutrons
  • accelerates neutrons
  • none of these
Q.13

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.14

Alpha-methyl-naphthalene (C11 H10) has a cetane number of

  • 0
  • 50
  • 100
  • 120
Q.15

In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

  • equal to
  • below
  • above
Q.16

Lubrication in I.C. engines dissipates the heat generated from the moving parts due to friction.

  • True
  • False
Q.17

Which of the following statement is correct regarding petrol engines?

  • A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure.
  • The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.
  • The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition.
  • all of the above
Q.18

For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.

  • less
  • more
Q.19

The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine.

  • low
  • very low
  • high
  • very high
Q.20

The purpose of testing an internal combustion engine is

  • to determine the information, which can not be obtained by calculations
  • to conform the data used in design, the validity of which may be doubtful
  • to satisfy the customer regarding the performance of the engine
  • all of the above
Q.21

The primary fuel used in nuclear power plants is

  • U235
  • U238
  • Pu239
  • Pu233
Q.22

In nuclear power plants, due to reflector, less fuel is needed to generate sufficient neutrons to sustain a chain reaction.

  • Yes
  • No
Q.23

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.24

The energy released during the fission of one atom of Uranium -in million electron volts is about

  • 100
  • 200
  • 300
  • 400
Q.25

The thermal efficiency of diesel engines on weak mixtures is

  • unaffected
  • lower
  • higher
  • dependent on other factors
Q.26

A moderator generally used in nuclear power plants is

  • graphite
  • heavy water
  • concrete
  • graphite and concrete
Q.27

The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

  • not effect
  • decrease
  • increase
Q.28

A mixture containingof iso-octane andof normal heptane will have

  • cetane number 65
  • octane number 65
  • qetane number 35
  • octane number 35
Q.29

In a four stroke cycle diesel engine, the exhaust valve

  • opens at 30° before bottom dead cnetre and closes at 10° after top dead centre
  • opens at 30° after bottom dead centre and closes at 10° before top dead centre
  • opens at bottom dead centre and closes at top dead centre
  • may open and close anywhere
Q.30

The two stroke cycle engines have lighter flywheel.

  • Agree
  • Disagree
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