Question Set 179

31.

Which of the following material has the maximum ductility?

A.	Mild steel
B.	Copper
C.	Zinc
D.	Aluminium

Answer: Option A

32.

When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the

A.	head
B.	shank
C.	thread
D.	middle

Answer: Option C

33.

In order to obtain the bolts of uniform strength, an axial hole is drilled through the head as far as the threaded portion such that the area of shank becomes equal to the root area of the thread.

A.	True
B.	False

Answer: Option A

34.

An open belt drive is used when

A.	shafts are arranged parallel and rotate in the opposite directions
B.	shafts are arranged parallel and rotate in the same directions
C.	shafts are arranged at right angles and rotate in one definite direction
D.	driven shaft is to be started or stopped whenever desired without interferring with the driving shaft

Answer: Option B

35.

In unilateral system of tolerance, the tolerance is allowed on

A.	one side of the actual size
B.	one side of the nominal size
C.	both sides of the actual size
D.	both sides of the nominal size

Answer: Option B

36.

The constant factor in case of R10 series of preferred numbers is

A.	1.06
B.	1.12
C.	1.26
D.	1.58

Answer: Option C

37.

The pipe joint mostly used for pipes carrying water at low pressures is

A.	socket joint
B.	nipple joint
C.	union joint
D.	spigot and socket joint

Answer: Option A

38.

According to Guest's theory, the failure occurs at a point in a member when the maximum shear stress in a bi-axial stress system reaches the shear stress at elastic limit in simple tension test.

A.	True
B.	False

Answer: Option A

39.

For maximum power, the velocity of the belt will be

A.
B.
C.
D.	none of these

Answer: Option C

40.

Surface endurance limit of gear material is dependent upon its

A.	elastic strength
B.	yield strength
C.	brinell hardness number
D.	toughness

Answer: Option C