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.Management Sciences
Category: I.C. Engines
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
In a cycle, the spark lasts roughly for ____________________?
A. 1 sec
B. 0.1 sec
C. 0.01 sec
D. 0.001 sec
E. 0.0001 sec
In the crankcase method of scavenging, the air pressure is produced by_________________?
A. supercharger
B. centrifugal pump
C. natural aspirator
D. movement of engine piston
E. reciprocating pump
In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?
A. low temperature
B. low density
C. long ignition delay
D. rich mixture
E. all of the above
The operation of forcing additional air under pressure in the engine cylinder is known as________________?
A. scavenging
B. turbulence
C. supercharging
D. pre-ignition
E. dissociation and carburretion of fuel
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