Machine Design - 2

Question 1

Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 Nm. The torque transmitted by gear is

Accepted Answer

60 Nm

Question 2

Module of gear is _______

Accepted Answer

$\frac{D}{T}$

Question 3

Match the following: | P. Bevel gears    | 1. Non-parallel intersecting shafts| |---|---| | Q. Worm gears    | 2. Non-parallel non-intersecting shafts |

Accepted Answer

P-1, Q-2

Question 4

Which one of the following is criterion in design of hydrodynamic journal bearing?

Accepted Answer

Sommerfeld number

Question 5

An imaginary circle which by pure rolling action, would give the same motion as the actual gear is _________.

Accepted Answer

Pitch circle

Question 6

Cam and follower belong to which kinematic pair

Accepted Answer

Higher pair

Question 7

The V-belts are particulary suitable for ________ drives.

Accepted Answer

Short

Question 8

The maximum achievable efficiency of chain drive is ______.

Accepted Answer

96-98%

Question 9

Jump phenomenon in cam and follower system is _______.

Accepted Answer

follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces

Question 10

In gear boxes of small size motors, rolling contact bearings are used.

Accepted Answer

True