Master Machine Elements: A Comprehensive Guide for Mechanical Principles

Question 1

What is the main purpose of a bearing in a mechanical system?

Accepted Answer

To guide and support a rotating shaft

Answer

To transmit torque between shafts

Answer

To reduce friction between moving parts

Answer

To change the direction of rotation

Question 2

Which type of gear is most suitable for applications requiring high torque transmission at low speeds?

Accepted Answer

Worm gear

Answer

Spur gear

Answer

Helical gear

Answer

Bevel gear

Question 3

What is the primary function of a V-belt in a power transmission system?

Accepted Answer

To provide flexibility and tension control

Answer

To transmit power over long distances between shafts

Answer

To change the direction of rotation

Answer

To reduce noise and vibration

Question 4

Which type of bearing is most suitable for a high-speed application with moderate radial loads?

Accepted Answer

Ball bearing

Answer

Roller bearing

Answer

Plain bearing

Answer

Thrust bearing

Question 5

What is the key difference between a spur gear and a helical gear?

Accepted Answer

Pitch angle

Answer

Tooth shape

Answer

Material used

Answer

Number of teeth

Question 6

Which of the following materials is typically not used for shafts in mechanical systems?

Accepted Answer

Copper

Answer

Steel

Answer

Aluminium

Answer

Cast iron

Question 7

What is the primary purpose of a coupling in a mechanical system?

Accepted Answer

To connect two shafts and transmit power

Answer

To align and support a shaft

Answer

To reduce shock and vibration

Answer

To change the direction of rotation

Question 8

Which of the following is specifically NOT a primary function of a shaft in a machine?

Accepted Answer

Heat generation

Answer

Power transmission

Answer

Load support

Answer

Motion transfer

Question 9

Roller bearings are preferred over ball bearings primarily when:

Accepted Answer

High radial loads are anticipated

Answer

High axial loads are anticipated

Answer

High speeds are involved

Answer

Compact designs are essential

Question 10

Which type of gear is most efficient for transmitting power at right angles without requiring additional components?

Accepted Answer

Bevel gear

Answer

Spur gear

Answer

Worm gear

Answer

Helical gear

Question 11

The primary role of a key in a shaft-hub connection is to:

Accepted Answer

Transmit torque

Answer

Prevent axial movement

Answer

Reduce vibration

Answer

Lubricate the connection

Question 12

Thrust bearings are designed specifically to:

Accepted Answer

Withstand axial loads

Answer

Withstand radial loads

Answer

Reduce friction in rotating applications

Answer

Prevent seizing in high-temperature environments

Question 13

The angle formed between the axes of two intersecting shafts connected by bevel gears is referred to as the:

Accepted Answer

Cone angle

Answer

Pitch angle

Answer

Pressure angle

Answer

Addendum angle

Question 14

Which of the following is the primary function of a shaft in a mechanical system?

Accepted Answer

Transmit rotary motion

Answer

Support radial loads

Answer

Convert linear motion to rotary motion

Answer

Reduce friction between moving parts

Question 15

Which type of bearing is designed to support both radial and axial loads effectively?

Accepted Answer

Tapered roller bearing

Answer

Ball bearing

Answer

Roller bearing

Answer

Thrust bearing

Question 16

What is a key advantage of using a frictionless bearing in a mechanical system?

Accepted Answer

Reduced power loss

Answer

Increased load capacity

Answer

Extended bearing life

Answer

Elimination of noise

Question 17

What is the primary function of a gear reducer in a mechanical system?

Accepted Answer

Decrease the speed of a rotating shaft

Answer

Increase the speed of a rotating shaft

Answer

Reverse the direction of rotation

Answer

Control the torque output

Question 18

Which type of belt is commonly used in applications requiring high power transmission?

Accepted Answer

V-belt

Answer

Flat belt

Answer

Timing belt

Answer

Chain

Question 19

What is the primary role of a clutch in a mechanical system?

Accepted Answer

Engage or disengage power transmission

Answer

Change the speed of a rotating shaft

Answer

Reduce noise and vibration

Answer

Improve efficiency

Question 20

What characteristic distinguishes V-belts from other types of belts?

Accepted Answer

Compatibility only with V-pulleys

Answer

Lower efficiency compared to flat belts

Answer

Enhanced durability over flat belts

Question 21

What is the primary function of a bearing in a mechanical system?

Accepted Answer

To support rotating or sliding elements and reduce friction

Answer

To transmit power

Answer

To change direction of motion

Question 22

Which type of gear is used to transmit motion between perpendicular shafts?

Accepted Answer

Bevel gear

Answer

Spur gear

Answer

Helical gear

Answer

Worm gear

Question 23

What is a key advantage of using a V-belt over a flat belt?

Accepted Answer

Higher power transmission capacity due to its wedging action

Answer

Reduced noise

Answer

Lower cost

Question 24

Which material is commonly used for manufacturing shafts due to its strength and durability?

Accepted Answer

Steel

Answer

Aluminium

Answer

Titanium

Answer

Ceramic

Question 25

What is the primary function of a key in a shaft-hub assembly?

Accepted Answer

To prevent relative rotation and securely connect the hub to the shaft

Answer

To transmit torque

Answer

To adjust the alignment

Question 26

Which type of bearing is most suitable for high-speed applications due to its low friction and ability to handle radial and axial loads?

Accepted Answer

Ball bearing

Answer

Needle bearing

Answer

Thrust bearing

Answer

Plain bearing

Question 27

What is one of the primary applications of a gear train in mechanical systems?

Accepted Answer

To achieve different speed and torque ratios, or to change the direction of motion

Answer

To reduce noise and vibration

Answer

To increase efficiency

Question 28

Which type of belt is known for its resistance to wear and tear, making it suitable for demanding applications?

Accepted Answer

Polyurethane belt

Answer

Cotton belt

Answer

Leather belt

Question 29

What is the main purpose of lubrication in the context of mechanical elements?

Accepted Answer

To reduce friction and wear, extending the lifespan of components and improving efficiency

Answer

To improve efficiency

Answer

To reduce noise