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.Management Sciences
Category: I.C. Engines
Volatility of diesel fuel oil is_________________?
A. minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B. temperature at which it solidifies or congeals
C. it catches fire without external aid
D. indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
E. temperature at which it flows easily
In carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________?
A. same level
B. slightly higher level
C. slightly lower level
D. may be anywhere
E. varies from situation to situation
Air fuel ratio at which a petrol engine can not work is_________________?
A. 8 : 1
B. 10 : 1
C. 15 : 1
D. 20 : 1 and less
E. will work at all ratios
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?
A. same
B. less
C. more
D. more or less depending on power rating
E. unpredictable
In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
A. same
B. less
C. more
D. variable
E. more/less depending on engine capacity.
The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as________________?
A. auto ignition
B. preignition
C. retarded ignition
D. accelerated ignition
E. detonation
Sulphur content in diesel oil should not be more than_________________?
A. 10%
B. 5%
C. 1%
D. 0.1%
E. 0.01%
The system of lubrication used for motor cycles and scooters is by________________?
A. forced lubrication system
B. splash lubrication
C. applying grease under pressure
D. wet sump method
E. mixing about 5% lub oil with petrol
It the temperature of intake air in IC engines is lowered, then its efficiency will_______________________?
A. increase
B. decrease
C. remain same
D. increase upto certain limit and then decrease
E. decrease upto certain limit and then in-crease
Method of governing used in petrol engine is________________?
A. quantity governing
B. quality governing
C. combined governing
D. partial governing
E. hit and miss governing
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