Machine Design MCQs

Question 1

An open belt drive is used when

Accepted Answer

Shafts are arranged parallel and rotate in the same directions

Answer

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

Answer

Shafts are arranged parallel and rotate in the opposite directions

Answer

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

Question 2

A fast and loose pulley drive is used when

Accepted Answer

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

Answer

Shafts are arranged parallel and rotate in the opposite directions

Answer

Shafts are arranged parallel and rotate in the same directions

Answer

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

Question 3

A compound belt drive is used when

Accepted Answer

None of the above

Answer

Shafts are arranged parallel and rotate in the opposite directions

Answer

Shafts are arranged parallel and rotate in the same directions

Answer

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

Question 4

The connecting rod bolts are tightened up with initial tension greater than the external load so that

Accepted Answer

The resultant load on the bolt would not be affected by the external cyclic load

Answer

Joint may not open up

Answer

Bolts are weakest elements

Answer

Bolts will not loosen during service

Question 5

In order to withstand resistance to wear, the best profile of gear is

Accepted Answer

$$14{\frac{1}{2}^ \circ }$$ full depth involute tooth

Answer

20° full depth involute tooth

Answer

20° involute stub tooth

Answer

$$14{\frac{1}{2}^ \circ }$$ stub tooth

Question 6

In hydrostatic bearings

Accepted Answer

The oil film is maintained by supplying oil under pressure

Answer

The Oil film pressure is generated only by the rotation of the journal

Answer

Do not require external supply of lubricant

Answer

Grease is used for lubrication

Question 7

In the levers of third type, the mechanical advantage is __________ one.

Accepted Answer

Less than

Answer

Equal to

Answer

More than

Answer

None of these

Question 8

Cast iron pipes are mainly used

Accepted Answer

In water and sewage systems

Answer

For conveying steam

Answer

In pressure lubrication systems on prime movers

Answer

All of the above

Question 9

A machine part subjected to _________ is called a strut.

Accepted Answer

An axial compressive force

Answer

A tangential force

Answer

An axial tensile force

Answer

Any one of these