Question Set 184

31. 

When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

A.

B.

C.

D.

Answer: Option B

 

32. 

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

A.

right hand

B.

left hand

Answer: Option B

 

33. 

A connecting rod is designed as a

A.

long column

B.

short column

C.

strut

D.

all of these

Answer: Option C

 

34. 

The cross-section of the arm of a bell crank lever is

A.

rectangular

B.

elliptical

C.

I-section

D.

any one of these

Answer: Option D

 

35. 

The rocker arms in internal combustion engines are of first type levers.

A.

Correct

B.

Incorrect

Answer: Option A

 

36. 

In a crossed belt drive, the shafts are arranged parallel and rotate in the same directions.

A.

Correct

B.

Incorrect

Answer: Option B

 

37. 

In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

A.

helix angle

B.

pressure angle

C.

pitch lead angle

D.

none of these

Answer: Option A

 

38. 

Idler pulley is used for

A.

increasing velocity ratio

B.

for applying tension

C.

changing the direction of motion of belt

D.

all of these

Answer: Option B

 

39. 

The bell crank levers used in railway signalling arrangement are of third type levers.

A.

True

B.

False

Answer: Option B

 

40. 

When spring index increases, the value of Wahl's stress factor

A.

increases linearly

B.

decreases linearly

C.

remains same

D.

increases exponentially

Answer: Option D