Machine Design MCQ Question with Answer

Machine Design MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 50
A screw is said to be over hauling screw, if its efficiency is

More than 50 %

Less than 50 %

Equal to 50 %

None of these

Question No : 51
A fast and loose pulley drive is used when

Shafts are arranged parallel and rotate in the opposite directions

Shafts are arranged parallel and rotate in the same directions

Shafts are arranged at right angles and rotate in one definite direction

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

Question No : 52
The shear plane in case of bolts should

Be across threaded portion of shank

Be parallel to axis of bolt

Be normal to threaded portion of shank

Never be across the threaded portion

Question No : 53
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

0.75/ (0.75 + √v)

3/ (3 + v)

4.5/ (4.5 + v)

6/ (6 + v)

Question No : 54
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Heavier

Lighter

Moderate

None of these

Question No : 55
Which of the following statement is wrong?

A key is used as a temporary fastening

A key is subjected to tensile stresses

A key is always inserted parallel to the axis of the shaft

A key prevents relative motion between the shaft and boss of the pulley

Question No : 56
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Hydrostatic lubricated bearing

Hydrodynamic lubricated bearing

Boundary lubricated bearing

Zero film bearing