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Mechanical Engineering
Internal Combustion Engines (I.C. Engines)
Quiz 3
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Q.1
In petrol engines, advancing of the spark timing will _________ the knocking tendency.
Not effect
Decrease
Increase
None of these
Q.2
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.
Not effected
Decrease
Increase
None of these
Q.3
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.4
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by
[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
(V₀/V₁)/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)
V₁/(V₀ + V₁)
Q.5
Thermal efficiency of a two stroke cycle engine is _________ a four stroke cycle engine.
Equal to
Less than
Greater than
None of these
Q.6
Most high speed compression engines operate on
Diesel cycle
Otto cycle
Dual combustion cycle
Special type of air cycle
Q.7
High speed compression engines operate on
Otto cycle
Diesel cycle
Dual combustion cycle
All of these
Q.8
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.
Not effect
Decrease
Increase
None of these
Q.9
Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.
Half
Same
Double
Four times
Q.10
The combustion in compression ignition engines is
Homogeneous
Heterogeneous
Both (A) and (B)
None of these
Q.11
Combustion in compression ignition engines is
Homogeneous
Heterogeneous
Both (A) and (B)
Laminar
Q.12
Antiknock for compression ignition engines is
Napthene
Tetra ethyl lead
Amyl nitrate
Hexadecane
Q.13
A diesel engine is _________ as compared to petrol engine, both running at rated load.
Equally efficient
Less efficient
More efficient
None of these
Q.14
Which of the following statement is correct regarding normal cetane?
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 of the above
Q.15
The mechanical efficiency (ηm) of the engine is given by
ηm = B.P/I.P
ηm = I.P/B.P
ηm = (B.P × I.P)/100
None of these
Q.16
The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
Detonation
Turbulence
Pre-ignition
Supercharging
Q.17
The power actually developed by the engine cylinder of an I.C. engine is known as
Theoretical power
Actual power
Indicated power
None of these
Q.18
Air fuel ratio at which a petrol engine cannot work is
8 : 1
10 : 1
15 : 1
20 : 1 and less
Q.19
In a four stroke cycle petrol engine, the expansion
Starts at top dead center and ends at bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
Starts at 30° after top dead center and ends at 50° after bottom dead center
May start and end anywhere
Q.20
The volumetric efficiency of a well designed engine may be
30 to 40%
40 to 60%
60 to 70%
75 to 90%
Q.21
Compression loss in I.C engines occurs due to
Leaking piston rings
Use of thick head gasket
Clogged air inlet slots
All of the above
Q.22
The reference fuels for knock rating of spark ignition engines would include
Iso-octane and alpha-methyl naphthalene
Normal octane and aniline
Iso-octane and normal hexane
Normal heptane and iso-octane
Q.23
The brake power of a diesel engine, keeping other parameters constant, can be increased by
Decreasing the density of intake air
Increasing the temperature of intake air
Increasing the pressure of intake air
Decreasing the pressure of intake air
Q.24
A supercharged engine as compared to an ordinary engine
Requires smaller foundation
Is lighter
Consumes less lubricating oil
All of these
Q.25
In a petrol engine, if diesel is used, then the engine will
Run at high speed
Not run
Run more efficiently
Explode
Q.26
A diesel engine as compared to petrol engine (both running and rated load) is
More efficient
Less efficient
Equally efficient
Other factors will decide it
Q.27
Supercharging is the process of supplying the intake air to the engine cylinder at a density _________ the density of the surrounding atmosphere.
Equal to
Less than
Greater than
None of these
Q.28
In a typical medium speed 4-stroke cycle diesel engines
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens at bottom dead center and closes at top dead center
Exhaust valve opens just after bottom dead center and closes just before top dead center
May open and close anywhere
Q.29
The octane number of petrol, generally available, is
20 to 40
40 to 60
60 to 80
80 to 100
Q.30
The cetane number of diesel oil, generally available, is
20 to 25
25 to 30
30 to 40
40 to 55
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