Kinematics and Theory of Machines (3131906) MCQs

MCQs of Friction, Clutch and Brake

Showing 41 to 50 out of 77 Questions
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41.

To ensure self-locking in a screw jack, it is essential that the helix angle is ______.

(a)

larger than friction angle
(b)

smaller than friction angle
(c)

equal to friction angle
(d)

such as to give maximum efficiency in lifting
Answer:

Option (b)

42.

A screw is said to be a self-locking screw if its efficiency is _______.

(a)

less than 50%
(b)

more than 50%
(c)

equal to 50%
(d)

equal to 100%
Answer:

Option (a)

43.

A screw is said to be an over-hauling screw if its efficiency is ______.

(a)

less than 50%
(b)

more than 50%
(c)

equal to 50%
(d)

equal to 100%
Answer:

Option (b)

44.

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as _____.

(a)

both ends fixed
(b)

both ends hinged
(c)

one end fixed and other end hinged
(d)

one end fixed and other end free
Answer:

Option (d)

45.

Which of the following screw thread is used for jacks, vices and clamps?

(a)

Square threads
(b)

Trapezoidal threads
(c)

Buttress threads
(d)

Acme threads
Answer:

Option (a)

46.

Which of the following screw thread is used for transmitting force in one direction?

(a)

Square threads
(b)

Trapezoidal threads
(c)

Buttress threads
(d)

V-threads
Answer:

Option (c)

47.

Which of the following screw thread is stronger than other threads?

(a)

Square threads
(b)

Trapezoidal threads
(c)

Buttress threads
(d)

V-threads
Answer:

Option (c)

48.

Which of the following screw thread is used for the lead screw of the lathe?

(a)

Square threads
(b)

Trapezoidal threads
(c)

Buttress threads
(d)

V-threads
Answer:

Option (b)

49.

The maximum efficiency of square threaded power depends upon ______.

(a)

lead angle of screw
(b)

friction angle
(c)

pitch of screw
(d)

nominal diameter of screw
Answer:

Option (b)

50.

A body will begin to move down an inclined plane if the angle of inclination of the plane is ____________ the angle of friction.

(a)

equal to
(b)

less than
(c)

greater than
(d)

double than
Answer:

Option (c)

Showing 41 to 50 out of 77 Questions
2 3 4 5 6 7