Question Set 191

 

1. 

The major diameter of a screw thread is also known as core or root diameter.

A.

Yes

B.

No

Answer: Option B

 

2. 

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

A.

1420 d

B.

1680 d

C.

2080 d

D.

2840 d

Answer: Option D

 

3. 

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A.

plasticity

B.

elasticity

C.

ductility

D.

malleability

Answer: Option C

 

4. 

The helix angle for single helical gears ranges from

A.

10° to 15°

B.

15° to 20°

C.

20° to 35°

D.

35° to 50°

Answer: Option C

 

5. 

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

A.

 full depth involute tooth

B.

20° full depth involute tooth

C.

20° involute stub tooth

D.

 stub tooth

Answer: Option A

 

6. 

A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

A.

1 kN-m

B.

2 kN-m

C.

3 kN-m

D.

4 kN-m

Answer: Option C

 

7. 

The design of pin of a rocker arm of an I.C. engine is based on

A.

bearing failure

B.

shearing failure

C.

bending failure

D.

all of these

Answer: Option D

 

8. 

For a shaft diameter of 100 mm, the number of bolts in a flange coupling should be

A.

4

B.

6

C.

8

D.

10

Answer: Option A

 

9. 

A wood-ruff key is

A.

a tapered key with head at one end

B.

fitted in pairs at right angles

C.

capable of tilting in a recess milled out in the shaft

D.

all of the above

Answer: Option C

 

10. 

In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley.

A.

Agree

B.

Disagree

Answer: Option B