Top 550+ Solved Machine Design MCQ Questions Answer
Q. As per Indian Boilers Regulations the type of joint preferred for circumferential joints is
a. Welded joint with cover plate
b. Any of above
c. Welded joint
d. Reveted butt joint
e. Riveted lap joint
Q. Setscrews are
a. Used on sheet metals only
b. Used to prevent relative motion between parts
c. Small screws
d. Self hreading
e. Headless screws
Q. A self-socking screw is one which
a. Has locking arrangement
b. Has a hole drilled through for inserting locking pin
c. Has coefficient of friction equal to or greater than the tangent of the load angle
d. Has fine pitch screw threads
e. None of the above
Q. A taper bearing has
a. Tapered roller
b. Tapered inner race
c. Tapered shaft
d. Tapered cage
e. Tapered outer race
Q. Resistance to fatigue of a material is measured by
a. Modulus of rigidity
b. Electricity parameters
c. Endurance limit
d. Elastic limit
e. Youngs modulus
Q. Wing screws are used where
a. tight grip is essential
b. frequently manual locking and unlocking is necessary
c. stress reversal is severe
d. high torque is needed for tightening
e. Increasing the diameter of threaded portion
Q. Maximum gear ratio can be expected in case of
a. Spur gears
b. Worm and worm wheel
c. Helical gears
d. Straight bevel gears
e. Double helical gears
Q. The edges of boiler plates for fullering and caulking are bevelled at an angle of
a. 60?
b. 45?
c. 70?
d. 30?
e. 80?
Q. Spring index is
a. Load carrying capacity of a spring
b. The ratio of coil diameter to wire diameter
c. The ratio of coil diameter to wire diameter
d. An indication of the equality of springs
e. The ratio of free length to that under design load
Q. Regenerative braking is used on
a. Earth moving machines
b. Heavy duty trucks
c. Electric locomotives
d. Diesel locomotives
e. Steam locomotives
Q. The plastic section modulus is
a. the ratio of plastic moment capacity of a section to the yield moment
b. Increasing the diameter of threaded portion
c. the ratio of moment of inertia to radius of gyration
d. the ratio of plastic moment capacity to the field stress
e. area multiplied by the radius of gyration
Q. All of the following statements are false except
a. The pitch of a sinle threaded screw is equal to the lead
b. In a flange coupling, the bolts are subjected to compressive stress
c. Oldham coupling is used for connecting piston rod of a steam engine to the cross head
d. The resilience of a bolt may be increased by decreasing its shank diameter
e. Increasing the diameter of threaded portion
Q. Neglecting bending, for a parallel load on a fillet weld of equal legs the plane of maximum shear occurs at
a. 45?
b. 15?
c. 60?
d. 30?
e. 22
Q. In watches and gramophones, which spring is most commonly used
a. Flat spiral spring
b. torsion helical spring
c. conical helical spring
d. none of the above
e. Cast steel
Q. The edge of the plates for boilers and tanks are usually bevelled at an angle of 80?
a. To reduce stress concentration
b. For safety
c. To facilitate joining
d. For fullering and caulking
e. None of the above