Question Set 189

31. 

When two helical springs of equal lengths are arranged to form a cluster spring, then

A.

shear stress in each spring will be equal

B.

load taken by each spring will be half the total load

C.

all of the above

D.

none of these

Answer: Option C

 

32. 

For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

A.

4

B.

6

C.

8

D.

10

Answer: Option C

 

33. 

The stress in the threaded part of the bolt will be __________ as compared to the shank.

A.

same

B.

higher

C.

lower

Answer: Option B

 

34. 

A shaft is a rotating machine element.

A.

Correct

B.

Incorrect

Answer: Option A

 

35. 

The dedendum circle diameter is equal to (where φ = Pressure angle)

A.

pitch circle diameter x cos φ

B.

addendum circle diameter x cos φ

C.

clearance circle diameter x cos φ

D.

pitch circle diameter x sin φ

Answer: Option A

36. 

Which one of the following is a positive drive?

A.

Crossed flat belt drive

B.

Rope drive

C.

V-belt drive

D.

Chain drive

Answer: Option D

 

37. 

Two closely coiled helical springs with stiffnesses k1 and k2 respectively are connected in series. The stiffness of an equivalent spring is given by

A.

B.

C.

D.

Answer: Option A

 

38. 

The period during which the cam follower remains at rest, when cam moves, is known as

A.

constant period

B.

fixed period

C.

dwell period

D.

idle period

Answer: Option C

 

39. 

The flank of the tooth is the

A.

surface of the top of the tooth

B.

surface of the tooth above the pitch surface

C.

surface of the tooth below the pitch surface

D.

width of the tooth measured along the pitch circle

Answer: Option C

 

40. 

The included angle for the British Association thread is

A.

29°

B.

47.3°

C.

55°

D.

60°

Answer: Option B