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.Management Sciences
Category: I.C. Engines
The air-fuel ratio of the petrol engine is controlled by__________________?
A. fuel pump
B. governor
C. injector
D. carburettor
E. scavenging
The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?
A. lean mixture
B. chemically correct mixture
C. rich mixture
D. unpredictable
E. none of the above
Combustion in compression ignition engines is____________________?
A. homogeneous
B. heterogeneous
C. both A. and B.
D. laminar
E. turbulent
Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?
A. heavy turbulence
B. improved scavenging
C. heavy supercharging
D. detonation
E. preignition
The ash content in diesel oil should bot be more than_______________?
A. 1%
B. 5%
C. 0.1%
D. 0.01%
E. 0.001%
A heat engine utilises the_________________?
A. calorific value of oil
B. low heat value of
C. high heat value of oil
D. mean heat value of oil
E. all of the above
Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?
A. iso-octane
B. mixture of normal heptane and iso-oc-tane
C. alpha methyl napthalene
D. mixture of methane and ethane
E. mixture of paraffins and aromatics
Fuel consumption of diesef engines is not guaranteed at one quarter load because at such low loads________________?
A. the friction is high
B. the friction is unpredictable
C. the small difference in cooling water temperature or in internal friction has a disproportionate effect
D. the engine is rarely operated
E. none of the above
For the same compression ratio_____________________?
A. Otto cycle is more efficient than the Diesel
B. Diesel cycle is more efficient’than Otto
C. both Otto and Diesel cycles are, equally efficient
D. compression ratio has nothing to do with efficiency
E. which is more efficient would depend on engine capacity
Air injection in I.C. engines refers to injection of___________________?
A. air only
B. liquid fuel only
C. liquid fuel and air
D. supercharging
E. does not exist
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