161. Railway rails are normally made of
(A) mild steel
(B) alloy steel
(C) high carbon
(D) tungsten steel
Answer: - high carbon
162. A diamond locating pin is used in jigs and fixtures because
(A) Diamond is very hard and wear resistant
(B) It occupies very little space
(C) It helps in assembly with tolerance on centre distance
(D) It has a long life
Answer: - It helps in assembly with tolerance on centre distance
163. A lead-screw with half nuts in a lathe, free to rotate in both directions has
(A) V-threads
(B) Whitworth threads
(C) Buttress threads
(D) Acme threads
Answer: - Acme threads
164. The following is an automatic clutch which is controlled by engine speed
(A) Cone clutch
(B) Centrifugal clutch
(C) Fluid clutch
(D) Disc clutch
Answer: - Centrifugal clutch
165. The process in which the molecules of a compound become large is known as
(A) Expansion
(B) Polymerisation
(C) Atomisation
(D) Charging
Answer: - Polymerisation
166. If speed of centrifugal pump is doubled, then
(A) Power required to operate is doubled
(B) The volumetric discharge is increased 4 times
(C) The head becomes 4 times
(D) Specific speed becomes 4 times
Answer: - The head becomes 4 times
167. In a laminated leaf spring, the various strips are made of different length for the following
reason
(A) Reduction in weight
(B) Ease in fabrication
(C) Space consideration
(D) Equal distribution of stress
Answer: - Equal distribution of stress
168. The Rockwell number refers to a material’s
(A) Toughness
(B) Plasticity
(C) Malleability
(D) Hardness
Answer: - Hardness
169. Engine Misfiring is likely to result from
(A) Spark plug gap too narrow
(B) Spark plug gap too wide
(C) Incorrect mixture
(D) Vapour lock in fuel line
Answer: - Spark plug gap too wide
170. With Continuous usage of the spark plug, the spark plug gap size
(A) Decrease
(B) Increases
(C) Remain the same
(D) Becomes zero
Answer: - Increases
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