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.Management Sciences
Category: I.C. Engines
In loop scavenging, the top of the piston is________________?
A. flat
B. contoured
C. slanted
D. depressed
E. convex shaped
Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
A. yes
B. no
C. to some extent
D. unpredictable
E. depends on other factors
The delay period in petrol engine is of the order of__________________?
A. 0.001 sec
B. 0.002 see
C. 0.01 sec
D. 0.05 sec
E. 0.1 sec
The self-ignition temperature of diesel oil compared to petrol is_________________?
A. higher
B. lower
C. same
D. depends on quality of fuel
E. unpredictable
The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?
A. increase
B. decrease
C. remain unaffected
D. increase/decrease depending upon engine capacity
E. first increase and then decrease
Ethyl fluid is used_______________________?
A. to increase the octane rating of the fuel
B. to increase the cetane rating of the fuel
C. as a defrosting agent
D. as a superior type of fluid compared to others
E. to improve lubricating quality of fuel
In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of____________________?
A. 250°C
B. 500°C
C. 1000°C
D. 150CPC
E. 2000°C
The theoretically correct air fuel ratio for petrol engine is of the order of___________________?
A. 6 : 1
B. 9 : 1
C. 12 : 1
D. 15 : 1
E. 20 : 1
Which of the following engines can work on very lean mixture__________________?
A. S.I. engine
B. C.I. engine
C. two stroke engine
D. four stroke engine
E. all of the above
In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________?
A. less than 100°C
B. between 100-250°C
C. between 250 – 300°C
D. between 400 – 500°C
E. between 500 – 1000°C
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