Machine Design MCQs

Question 1

If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

Accepted Answer

$$\frac{1}{2}\left( {{{	ext{P}}_1} + {{	ext{P}}_2}} ight)$$

Answer

$${{	ext{P}}_1} - {{	ext{P}}_2}$$

Answer

$${{	ext{P}}_1} + {{	ext{P}}_2}$$

Answer

$$\frac{1}{2}\left( {{{	ext{P}}_1} + {{	ext{P}}_2}} ight) + {{	ext{P}}_{	ext{c}}}$$

Question 2

Turn buckle has

Accepted Answer

Left hand threads on one end and right hand threads on other end

Answer

Right hand threads on bout ends

Answer

Left hand threads on both ends

Answer

No threads

Question 3

The angle of twist of shaft is

Accepted Answer

Inversely proportional to (shaft diameter)4

Answer

Directly proportional to (shaft diameter)2

Answer

Inversely proportional to (shaft diameter)2

Answer

Directly proportional to (shaft diameter)4

Question 4

Guest's theory of failure is applicable for following type of materials

Accepted Answer

Ductile

Answer

Brittle

Answer

Elastic

Answer

Plastic

Question 5

Rankine's theory of failure is applicable for following type of materials

Accepted Answer

Brittle

Answer

Ductile

Answer

Elastic

Answer

Plastic

Question 6

The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to $$\frac{6}{{6 + {	ext{v}}}}$$ .

Accepted Answer

20 m/s

Answer

10 m/s

Answer

12.5 m/s

Answer

15 m/s

Question 7

Lewis equation is applied

Accepted Answer

To weaker of the pinion or gear

Answer

Only to the pinion

Answer

Only to the gear

Answer

To stronger of the pinion or gear

Question 8

In a hydrodynamic lubricated bearing

Accepted Answer

There is a thick film of lubricant between the journal and the bearing

Answer

There is a thin film of lubricant between the journal and the bearing

Answer

The lubricant is forced between the journal and the bearing, by external pressure

Answer

There is no lubricant between the journal and the bearing

Question 9

Idler pulley is used for

Accepted Answer

For applying tension

Answer

Increasing velocity ratio

Answer

Changing the direction of motion of belt

Answer

All of these