461. If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?
A. exhaust will be smoky
B. piston rings would stick into piston grooves
C. exhaust temperature will be high
D. engine starts overheating
E. scavenging occurs

462. 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

463. 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

464. As a result of detonation in an I.C. engine, following parameter attains very high value _____________________?
A. peak pressure
B. rate of rise of pressure
C. rate of rise of temperature
D. peak temperature
E. rate of rise of horse-power

465. Most high speed compression engines operate on __________________?
A. Diesel cycle
B. Otto cycle
C. Dual combustion cycle
D. Special type of air cycle
E. Carnot cycle

466. Which of the following medium is compressed in a Diesel engine cylinder __________________?
A. air atone
B. air and fuel
C. air and lub oil
D. fuel alone
E. air, fuel and lub oil

467. In a typical medium speed, 4-stroke cycle diesel engine ___________________?
A. fuel injection starts at 10° before to dead center and ends at 20° after tor dead center
B. fuel injection starts at top dead center and ends at 20° after top dead center
C. fuel injection starts at just before top dead center and ends just after top deac center
D. may start and end anywhere
E. none of the above

468. 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

469. The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
A. increase linearly
B. decrease linearly
C. increase parabolically
D. decrease parabolically
E. first decrease linearly and then increase parabolically

470. 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

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU

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