MECHANICAL ENGINEERING MCQ SECTION 16

151. The Hook’s law for vibration of spring for free oscillation is

(A) mg = ks

(B) mg = ks²

(C) mg = – ks²

(D) mg = constant

152. The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

(A) same

(B) less

(C) more

(D) more or less depending on power rating

153. The knocking in spark ignition engines can be reduced by

(A) Retarding the spark

(B) Increasing the engine speed

(C) Both (A) and (B)

(D) None of these

154. The mini drafter serves the purpose of everything except

(A) Scales

(B) Set square

(C) Protractor

(D) Compass

155. The two ways of drawing orthographic projection are

(A) First angle, second angle

(B) First angle, third angle

(C) Second angle, third angle

(D) Second angle, fourth angle

156. The profile of a gear teeth is in the form of

(A) parabola

(B) involute

(C) spiral

(D) helix

157. This is the bottom surface joining the sides of two adjacent threads

(A) Lead

(B) Pitch

(C) Crest

(D) Root

158. The degree of closeness of the measured value of a certain quantity with its true value is known as

(A) Accuracy

(B) Precision

(C) Standard

(D) Sensitivity

159. Following is the theoretical size which is common to both the parts of a mating pair

(A) Normal size

(B) Actual size

(C) Base size

(D) All of the above

160. When visual indication of pressure level is required then the instrument generally used is?

(A) Monometers

(B) Diaphragm sensors

(C) Bourdon tube

(D) Resonant wire device