71. The efficiency of a centrifugal pump is maximum when its blades are
(A) straight
(B) bent forward
(C) bent backward
(D) bent forward first and then backward
Answer: - bent backward
72. Air vessels in reciprocating pump are used to
(A) smoothen flow
(B) reduce acceleration to minimum
(C) increase pump efficiency
(D) save pump from cavitation
Answer: - reduce acceleration to minimum
73. A fluid is said to be ideal, if it is
(A) incompressible
(B) viscous and incompressible
(C) inviscous and compressible
(D) inviscous and incompressible
Answer: - inviscous and incompressible
74. The temperature indicating instrument in vehicles indicates the temperature of
(A) Engine piston
(B) Engine cylinder
(C) Lubricating oil
(D) Jacket cooling water
Answer: - Jacket cooling water
75. Two general types of tyres are
(A) Tube type and tubeless
(B) Solid and tubeless
(C) Air and pneumatic
(D) Split rim and drop centre
Answer: - Tube type and tubeless
76. The motion of the cam is transferred to the valves through
(A) Pistons
(B) Rocker arms
(C) Camshaft pulley
(D) Valve stems
Answer: - Rocker arms
77. The power actually developed inside the engine cylinder is called as
(A) Indicated power
(B) Brake power
(C) Frictional power
(D) None of these
Answer: - Indicated power
78. Petrol that detonates easily is called
(A) High octane petrol
(B) Low octane petrol
(C) Unleaded petrol
(D) Blended fuel
Answer: - Low octane petrol
79. The advantage of a tubeless tyre over tube type tyre is
(A) Slow air leakage
(B) Better fuel efficiency
(C) Less chances of running flat
(D) All of these
Answer: - All of these
80. The sequence order of events in a four stroke engine is
(A) Suction exhaust power compression
(B) Suction power compression exhaust
(C) Suction compression power exhaust
(D) Exhaust compression power suction
Answer: - Suction compression power exhaust
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