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Mechanical Engineering
Internal Combustion Engines (Ic Engine)
Quiz 2
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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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