Multiple Choice Questions (MCQ) with Answers on Mechanical Engineering
41-For a Newtonian fluid:
(A) Shear stress is proportional to acceleration
(B) Rate of shear stress is proportional to shear strain
(C) Shear stress is proportional to density
(D) Shear stress is proportional to rate of shear strain
42-A Venturimeter is used to measure:
(A) Density
(B) Pressure
(C) Discharge
(D) None of the above
43-The SI unit of kinematic viscosity is
(A) m2/s
(B) kg/m
(C) m/s2
(D) m/s
44-For a laminar flow through a circular pipe, Reynolds number will be
(A) More than 5000
(B) More than 4500
(C) Less than 2000
(D) None of the above
45-Thermal conductivity of pure copper at room temperature is approximately
(A) 38 W/m.K
(B) 9 W/m.K
(C) 398 W/m.K
(D) 3285 W/m.K
46-Critical radius of insulation for cylindrical body is (if k is thermal conductivity of insulation and ‘h’ is convention heat transfer coefficient):
(A) h/k
(B) k/h
(C) 2k/h
(D) 2h/k
47-A fin efficiency is defined as
(A) Actual heat transfer rate from the fin / Ideal heat transfer rate from the fin
(B) Ideal heat transfer rate from the fin / Actual heat transfer rate from the fin
(C) Heat transfer rate from the fin / Heat transfer without fin
(D) All of the above
48-A Carnot cycle is having an efficiency of 0.78. If the temperature of the high temperature reservoir is 1241 K, What is the temperature of the low temperature reservoir?
(A) 0°C
(B) 0 K
(C) 273°C
(D) 100 K
49-The most appropriate description of a Helical gear is
(A) Axes parallel and teeth are inclined to the axis
(B) Axes non parallel and non-intersecting
(C) Axes are perpendicular and used for large speed reduction
(D) None of the above
50-For Rack and Pinion
(A) Axes non parallel and non-intersecting
(B) Axes parallel and one of the gears has infinite radius
(C) Any of the above
(D) None of the above
ANSWERS:
41-(D), 42-(C), 43-(A), 44-(C), 45-(C), 46-(B), 47-(A), 48-(C), 49-(A), 50-(B)