A. Journal
B. Propeller
C. Impeller
D. Crank
Ans -: A
Q.2 What is the effect of early or late injection of fuel in the diesel engine?
A. Knocking
B. Detonation
C. Loss of power
D. More exhaust gases
Ans -: C
Q.3 The stroke-bore ratio in case of aircraft engines in normally ____ .
A. Above 1.5
B. Below 1.0
C. 1.2 to 1.4
D. None of these
Ans -: B
Q.4 The ratio of brake power output to the fuel energy input per unit time is called __.
A. Mechanical efficiency
B. Power produced
C. Thermal efficiency
D. Engine efficiency
Ans -: C
Q.5 Which components are used to produce gas-tight seal between the piston and the cylinder liners ?
A. Piston crown
B. Lube oil
C. Piston pin
D. Piston rings
Ans-: D
Q.6 For 6 cylinder petrol engine, standard firing order is _____ .
A. 1-4-2-3-5-6
B. 1-2-3-4-5-6
C. 1-4-2-6-3-5
D. 1-3-5-2-4-6
Ans -: C
Q.7 The thermal efficiency of petrol engine in comparison to diesel engine is ____ .
A. Higher
B. Lower
C. Same
D. None of these
Ans -: B
Q.8 In the spark ignition engine, normal heptane in the fuel ______ .
A. Increase power output
B. Decrease auto ignition
C. Accelerates auto ignition
D. None of these
Ans -: C
Q.9 If fuel air ratio is greater than one then the mean effective pressure is ______ .
A. Minimum
B. Maximum
C. Higher
D. Lower
Ans -: B
Q.10 Brake power of diesel engine can be increased by increasing pressure of ____ .
A. Intake air
B. Injecting fuel
C. Lubricating oil
D. All of the above
Ans -: A
Q.11 What is the principal source of exhaust carnon monoxide ?
A. Poor mixture combustion
B. Rich mixture combustion
C. Lower grade fuel combustion
D. None of these
Ans -: B
Q.12 Which of these emissions cause photochemical smog ?
A. NOx
B. HC
C. CO
D. A+B
Ans -: D
Q.13 Which acid is used in automobiles battery?
A. HCL
B. H2SO4
C. HNO3
D. Hydrogen
Ans -: B
Q.14 When an engine is idling , it requires ___.
A. High compression ratio
B. Lower compression ratio
C. Rich fuel air mixture
D. Less fuel
Ans -: C
Q.15 which medium is used for cooling of piston in diesel engines?
A. Water
B. Air
C. Synthetic oil
D. Lubricating oil
Ans -: D
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