211. For pipes, laminar flow occurs when Reynold’s number is
(A) less than 2000
(B) between 2000 and 4000
(C) more than 4000
(D) less than 4000
Answer: - less than 2000
212. Cavitation is caused by
(A) high velocity
(B) high pressure
(C) weak material
(D) low pressure
Answer: - low pressure
213. The function of oil control rings is that it
(A) Lubricates the cylinder wall by releasing oil from its hole
(B) Keeps the cylinder wall lubricated by holding oil in its channel
(C) Prevents engine oil from going into the combustion chamber and returns excess lubricating
oil off the cylinder wall through the return holes in the piston to the oil pan
(D) Maintains a seal and prevents escape of burned gases and oil leakage
Answer: - Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan
214. An imbalanced wheel during vehicle operation
(A) Makes large noise when its heavy point hits the road surface
(B) Deflects in the vehicle’s longitudinal direction
(C) Bounces vertically or deflects from side to side (as seen from front or rear)
(D) Creates a standing wave
Answer: - Bounces vertically or deflects from side to side (as seen from front or rear)
215. The parking brakes employed in vehicles are operated
(A) Mechanically
(B) Hydraulically
(C) Pneumatically
(D) None of these
Answer: - Mechanically
216. The connecting rod is attached to the piston by the
(A) Cap bolt
(B) Piston pin
(C) Cap roller bearing
(D) Rod cap
Answer: - Piston pin
217. In a Diesel engine, the function of a fuel injector is to
(A) Mix the fuel and air
(B) Ignite the air-fuel mixture
(C) Provide flame front for ignition
(D) Spray atomized fuel in the cylinder
Answer: - Spray atomized fuel in the cylinder
218. The cam shaft in an engine is always mounted
(A) Parallel to the crankshaft
(B) Perpendicular to the crankshaft
(C) Inclined to the crankshaft
(D) None of these
Answer: - Parallel to the crankshaft
219. The basic function of the suspension is to
(A) Absorbs vibration and impact forces from the road surface
(B) Ensure that the steering wheel can deliver a suitable amount of steering force
(C) Ensure that wheel alignment is not disturbed during driving
(D) Automatically correct the effects of over steering
Answer: - Absorbs vibration and impact forces from the road surface
220. The locus of a point on a thread unwound from a cylinder will be
(A) a straight line
(B) a circle
(C) involute
(D) cycloidal
Answer: - involute
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