MECHANICAL ENGINEERING MCQ SECTION 8

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