71. The mixture requirement of a S.I. The engine under normal running on road is
(A) A stoichiometric mixture
(B) A rich mixture
(C) A lean mixture
(D) None of the above
Answer: - A lean mixture
Lean-burn refers to the burning of fuel with an excess of air in an internal combustion engine. In lean-burn engines the air: fuel ratio may be as lean as 65:1.
(Text credit: - Wikipedia)
72. Inlet valve of a four-stroke IC engine remains open for about.
(A) 180°
(B) 150°
(C) 260°
(D) 230°
Answer: - 230°
73. An engine indicator diagram is used to determine
(A) Speed
(B) BHP
(C) Temperature
(D) Mean effective pressure
Answer: - Mean effective pressure
The mean effective pressure is a quantity relating to the operation of reciprocating engines and is a valuable measure of an engine's capacity to do work that is independent of engine displacement.
(Text credit: - Wikipedia)
74. Which of the following acids is used in automobile battery?
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulphuric acid
(D) none of these
Answer: - Sulphuric acid
75. A brake lining is usually made of
(A) Fabric
(B) Leather
(C) Cork
(D) Asbestos
Answer: - Asbestos
76. “Heel” and “ Toe wear” in tyre is caused by
(A) Excessive acceleration and braking
(B) Overinflation
(C) Under inflation
(D) Excessive camber
Answer: - Excessive acceleration and braking
77. The clutch is located between the transmission and the
(A) Engine
(B) Rear axle
(C) Propeller shaft
(D) Differential
Answer: - Engine
78. Critical or whirling speed of a shaft is increased by
(A) Increasing its length
(B) Decreasing power
(C) Decreasing its diameter
(D) None of the above
Answer: - Decreasing power
79. The gas used in the modern shock absorber is
(A) Nitrogen
(B) Oxygen
(C) Hydrogen
(D) Carbon dioxide
Answer: - Nitrogen
80. Best spanner for automobile work is the
(A) Open-ended type
(B) Combination type
(C) Ring type
(D) Socket type
Answer: - Socket type
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