MECHANICAL ENGINEERING MCQ SECTION 19

181. Swaying couple results due to

(A) Primary disturbing force

(B) Secondary disturbing force

(C) Partial balancing

(D) Hammer blow

Answer: - Primary disturbing force

182. In testing of material for endurance strength, it is subjected to

(A) Static load

(B) Dynamic load

(C) Completely reversed load

(D) Impact load

Answer: - Completely reversed load

Endurance limit (Se) is the stress level below which a specimen can withstand cyclic stress indefinitely without exhibiting fatigue failure.

183. At a node of the shaft, the vibrations are        

(A) Minimum

(B) Maximum

(C) Corresponding to natural frequency

(D) Zero

Answer: - Zero

184. The rate of decay of oscillations is known as

(A) Critical damping

(B) Damping co-efficient

(C) Transmissibility

(D) Logarithmic decrement

Answer: - Logarithmic decrement

Logarithmic decrement, is used to find the damping ratio of an underdamped system in the time domain. The method of logarithmic decrement becomes less and less precise as the damping ratio increases past about 0.5; it does not apply at all for a damping ratio greater than 1.0 because the system is overdamped.

(Text credit: - Wikipedia)

185. In a damped vibration system, the damping force is proportional to

(A) Displacement

(B) Velocity

(C) Acceleration

(D) Vibrations

Answer: - Velocity

186. The thickness of oil film at the surface of slip gauges is the order of

(A) 0.005 micron

(B) 0.1 micron

(C) 1 micron

(D) 10 micron

Answer: - 0.005 micron

187. Clinometer is an instrument concerned with

(A) Flatness measurement

(B) Angular measurement

(C) Linear measurement

(D) Roundness measurement

Answer: - Angular measurement

An inclinometer or clinometer is an instrument used for measuring angles of slope, elevation, or depression of an object with respect to gravity's direction.

simple clinometer

Mechanical spirit level clinometer with micrometer adjustment

(Text & photo credit: - Wikipedia)

188. The material for centre electrode in spark plug is

(A) Carbon

(B) Platinum

(C) Platinum tungsten alloy

(D) Nickel alloy

Answer: - Platinum tungsten alloy

189. The moisture in a refrigerant is removed by

(A) Evaporator

(B) Safety relief valve

(C) Dehumidifier

(D) Driers

Answer: - Driers

190. Which of the following meters is not associated with viscosity ?

(A) Red wood

(B) Say bolt

(C) Engler

(D) Orsat

Answer: - Orsat