Top 550+ Solved Machine Design MCQ Questions Answer
Q. Which of the following key permits axial relative motion between the shaft and the hub?
a. Wood ruff key
b. Square key
c. Increasing the diameter of threaded portion
d. Gib headed key
e. Feather key
Q. The moment-cuvature relation at a plastic hinge is
a. is a constant curvature for all moments
b. a constant moment for different curvatures
c. Increasing the diameter of threaded portion
d. always linear
e. always linear
Q. A simple supported steel beam when loaded with a force of 100 kg at A is found to deflect 10 mm at B. What force at B would cause a deflection of 2.5 mm at A
a. 10 kg
b. 50 kg
c. 100 kg
d. 400 kg
e. 25 kg
Q. Acoustical materials
a. Create sound
b. Create and reflect sound
c. Absorb sound
d. Reflect sound
e. Absorb and reflect sound
Q. Fatigue strength of a surface may be increased by
a. Applying concentrated hydrochloric acid on the surface
b. Applying birine on the surface and then washing with cold water
c. Making surface rough
d. Filling the surface
e. Polishing the surface
Q. The function of gear box in an automobile is
a. To provide variable speeds
b. To reduce speed
c. To increase speed
d. To produce torque
e. To increase efficiency
Q. A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be
a. 1333 kg/cm2
b. 1000 kg/cm2
c. 667 kg/cm2
d. 1500 kg/cm2
e. 500 kg/cm2
Q. Braking system used on aircraft is
a. Pneumatic
b. Regenerative
c. Plugging
d. Hydraulic
e. Mechanical
Q. A fine series screws of major diameter 8 mm and pitch 1 mm is generally designated as
a. M 8 x 1
b. 8 x M 1
c. 8 x 1 M
d. 8 M
e. 8 M 1
Q. In order to avoid interference for 20 pressure and teeth, minimum number of teeth should be
a. 8
b. More than 18
c. 12
d. More than 24
e. 16
Q. The bursting pressure of 12 mm ID, 14 mm OD seamless cartridge brass tubing having ultimate whear stress of 225 Mpa, will be nearly
a. 40 Kpa
b. Increasing the diameter of threaded portion
c. 20 Kpa
d. 10 Kpa
e. 30 Kpa
Q. Web crippling in beams generally occurs at points where
a. concentrated load occurs
b. deflection is maximum
c. Increasing the diameter of threaded portion
d. shear force is maximum
e. bending moment is maximum
Q. Oldham's coupling is used to cannect two shafts which
a. Are not in exact alignment
b. Have two axes intersecting
c. Have lateral misalignment
d. Have lateral movement during power transmission
e. Changes axes during power transmission
Q. Smooth bearing surface is an essential pre-requisite in case of
a. thin-film lubrication
b. thick film lubrication
c. both film (A) and (B) above
d. none of the above
e. Increasing the diameter of threaded portion