91. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on
(A) Too lean mixture
(B) Stoichiometric mixture
(C) Most economical mixture
(D) Too rich mixture
Answer: - Too rich mixture
92. In a forced feed lubrication system, the device used to guard against excessive oil pressure, is known as
(A) Release chamber
(B) Balancer
(C) Relief valve
(D) Stop valve
Answer: - Relief valve
93. The purpose of a balancer shaft is to
(A) Balance the timing in the movement of the two groups of pistons
(B) Increase inertia force of the rotating crankshaft
(C) Reduce vibrations caused by the crankshaft rotation
(D) Adjusts the timing of the intake and exhaust valve openings
Answer: - Reduce vibrations caused by the crankshaft rotation
94. The function of a radiator fan in the cooling system is that
(A) It blows air through the radiator when necessary
(B) It is turned by wind force as the vehicle moves forward, and its rotation drives the water
pump
(C) It cools the engine by blowing air onto the cylinder block
(D) It draws heat out of the engine compartment
Answer: - It blows air through the radiator when necessary
95. Automobile steering gear is an example of
(A) higher pair
(B) sliding pair
(C) turning pair
(D) lower pair
Answer: - turning pair
96. The tool material, for faster machining, should have
(A) Wear resistance
(B) Red hardness
(C) Toughness
(D) All of these
Answer: - All of these
97. Diesel engine can work on very lean air fuel ratio of the order of 30 :1. A petrol engine can also work on such a lean ratio provided
(A) it is properly designed
(B) best quality fuel is used
(C) cannot work as it is impossible
(D) flywheel size is proper
Answer: - cannot work as it is impossible
98. Pour point of fuel oil is the
(A) minimum temperature to which oil is heated in order to give off inflammable vapours in enough quantity to ignite momentarily when brought in contact with a flame
(B) temperature at which it solidifies or congeals
(C) it catches fire without external aid
(D) indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
Answer: - temperature at which it solidifies or congeals
99. A front stabilizer bar is used to
(A) Increase vehicle load carrying capacity
(B) Provide a softer ride
(C) Control suspension movement and body roll
(D) All of the above
Answer: - Control suspension movement and body roll
100. The tyre rotation is generally done at
(A) 1000 km
(B) 4000 km
(C) 6000 km
(D) 10,000 km
Answer: - 10,000 km
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