Question Set 200

41. 

Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

A.

2

B.

4

C.

8

D.

16

Answer: Option D

 

42. 

Wahl's stress factor __________ very rapidly as the spring index decreases.

A.

increases

B.

decreases

Answer: Option A

 

43. 

For circumferential joint in boilers, the type of joint used is

A.

butt joint with single cover plate

B.

butt joint with double cover plate

C.

lap joint with one ring overlapping the other

D.

any one of the above

Answer: Option C

 

44. 

In cyclic loading, stress concentration is more serious in

A.

brittle materials

B.

ductile materials

C.

brittle as well as ductile materials

D.

elastic materials

Answer: Option B

 

45. 

For a square key made of mild steel, the shear and crushing strength are related as

A.

shear strength is equal to crushing strength

B.

shear strength is greater than crushing strength

C.

shear strength is less than crushing strength

D.

none of the above

Answer: Option A

46. 

The velocity factor for precision metallic gears cut with high accuracy and operating at velocities upto 20 m/s is equal to

A.

B.

C.

D.

Answer: Option A

 

47. 

In a bolt, the plane of shear should be across the threaded portion of the shank.

A.

Correct

B.

Incorrect

Answer: Option B

 

48. 

When a metal or alloy is cold worked,

A.

its hardness and strength increases

B.

it is worked below recrystallisation temperature

C.

Both (A) and (B)

D.

None of these

Answer: Option C

 

49. 

A leaf spring in automobiles is used

A.

to apply forces

B.

to measure forces

C.

to absorb shocks

D.

to store strain energy

Answer: Option C

 

50. 

According to I.B.R., the factor of safety of riveted joint should not be less than

A.

1

B.

2

C.

3

D.

4

Answer: Option D