Top 550+ Solved Machine Design MCQ Questions Answer
Q. A concrete wall generally
a. Absorbs and transmits sound
b. Reflects sound
c. Transmits sound
d. Absorb sound
e. Creates sound
Q. When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at
a. Anywhere
b. Shank
c. Threaded portion
d. Head
e. Transition between head and shank
Q. Maximum efficiency expected in case of single mech supr gears is around
a. 58%
b. 98%
c. 88%
d. 68%
e. 78%
Q. In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be
a. 500 kg/cm2
b. 250 kg/cm2
c. 595 kg/cm2
d. 750 kg/sq-cm
e. 300 kg/cm2
Q. The life of ball bearings as listed in catalogue represents
a. 25% survival rate
b. 90% survival rate
c. 50% survival rate
d. 75% survival rate
e. Increasing the diameter of threaded portion
Q. Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between
a. 50 and 100
b. 30 and 50
c. 10 and 30
d. 120 and 200
e. Increasing the diameter of threaded portion
Q. Jaw clutches
a. cause shock loads when engaging
b. get disengaged at high rpm
c. get disengaged in reverse direction
d. are friction clutches which generate heat when enegaged
e. Increasing the diameter of threaded portion
Q. A rack is a gear
a. With infinite diametral pitch
b. With infinite pitch circle diameter
c. With infinite module
d. With infinite number of teeth
e. With infinite circular pitch
Q. Expansion joints are provided on pipes carrying
a. Viscous fluids
b. Water
c. Air at pressures below atmospheric pressure
d. Steam
e. Air at high pressures
Q. The advantage of needle roller bearing over ball bearing is
a. Less friction
b. Less area requirement
c. Smooth operation
d. Large ratio of load capacity to size
e. None of the above
Q. A V-belt designated as C 120 will have
a. 120 mm as the dia of small pulley
b. 120 cm as the length of belt
c. 120 inch as the length of belt
d. 120 cm as the centre distance between pulleys
e. None of the above
Q. Dielectric strength of a material is
a. Capacity to withstand high voltage
b. Capacity to resist flow of current
c. Capacity to take variable stresses
d. Energy storage capacity
e. Magnetic property
Q. According to IS 800, the lacing bars should resist a transverse shear equal to
a. 7.50%
b. 2.50%
c. Increasing the diameter of threaded portion
d. 17.50%
e. 12.50%
Q. The bunkers are the containers in which the plan of rupture intersects
a. the opposite face (wall) near the bottom
b. Increasing the diameter of threaded portion
c. the opposite face (wall) near the top
d. the bottom surface of material stored
e. the top surface of material stored
Q. Laser treatment of components increases fatigue resistance of metals by
a. compressing holes
b. filling vacancies
c. freezing discontinuities
d. none of the above
e. Increasing the diameter of threaded portion