Master Machine Elements: Gears, Bearings, and Shafts

Question 1

Which type of gear is specifically designed for transmitting motion between parallel shafts?

Accepted Answer

Spur gear

Answer

Helical gear

Answer

Bevel gear

Answer

Worm gear

Question 2

What is the primary function of bearings in mechanical systems?

Accepted Answer

Supporting and guiding rotating or sliding shafts

Answer

Reducing friction

Answer

Transmitting power

Answer

Controlling shaft speed

Question 3

Which of the following factors is not relevant when selecting a suitable shaft material?

Accepted Answer

Shaft appearance

Answer

Load capacity

Answer

Operating speed

Answer

Operating environment

Question 4

What is the main purpose of using a key in a shaft-hub connection?

Accepted Answer

Preventing relative rotation between the shaft and hub

Answer

Transmitting torque from the shaft to the hub

Answer

Adjusting the hub's position on the shaft

Answer

Balancing the rotating mass

Question 5

What is a primary advantage of using a hydrodynamic bearing over a rolling-element bearing?

Accepted Answer

Lower friction

Answer

Higher load capacity

Answer

Reduced noise

Answer

Longer life

Question 6

What is the recommended surface finish for a shaft that will be used with a rolling-element bearing?

Accepted Answer

Fine

Answer

Rough

Answer

Medium

Answer

Superfine

Question 7

Which of the following is NOT a fundamental type of gear?

Accepted Answer

Rack and pinion

Answer

Spur gear

Answer

Bevel gear

Answer

Worm gear

Question 8

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

Accepted Answer

To reduce friction and support loads

Answer

To transmit power

Answer

To convert rotary motion to linear motion

Answer

To store energy

Question 9

Which of the following is NOT a factor that affects the efficiency of a gear train?

Accepted Answer

Belt tension

Answer

Number of gears

Answer

Gear ratio

Answer

Lubrication

Question 10

Which of the following is the primary material used in the construction of shafts?

Accepted Answer

Steel

Answer

Aluminium

Answer

Brass

Answer

Titanium

Question 11

Which type of gear is used to transmit motion between parallel shafts and has teeth that are straight and parallel to the shaft axis?

Accepted Answer

Spur gear

Answer

Bevel gear

Answer

Helical gear

Answer

Worm gear

Question 12

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

Accepted Answer

To reduce friction and support loads

Answer

To transmit power

Answer

To connect components

Answer

To prevent vibration

Question 13

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

Accepted Answer

Steel

Answer

Aluminum

Answer

Plastic

Answer

Wood

Question 14

What is the main purpose of a gear train in a mechanical system?

Accepted Answer

To increase torque or to decrease speed

Answer

To change direction of rotation

Answer

To synchronize movement

Answer

To reduce vibration

Question 15

What is the significance of the pitch diameter in a gear?

Accepted Answer

It determines the size and shape of the gear's teeth

Answer

It affects the gear's contact ratio

Answer

It determines the gear's speed

Answer

It affects the gear's efficiency

Question 16

Which of the following is not a key factor to consider when selecting a bearing for a specific application?

Accepted Answer

Cost

Answer

Load capacity

Answer

Speed

Answer

Lubrication

Question 17

What is the main function of a bearing in a machine component?

Accepted Answer

To guide and support rotating or sliding components

Answer

To reduce friction between moving surfaces

Answer

To transmit power

Answer

To convert rotary motion to linear motion

Question 18

What is the term used to describe the center-to-center distance between adjacent gear teeth?

Accepted Answer

Pitch circle diameter

Answer

Addendum

Answer

Dedendum

Answer

Pressure angle

Question 19

What is the primary purpose of a keyway on a shaft?

Accepted Answer

To transmit torque between the shaft and a hub or pulley

Answer

To prevent shaft rotation

Answer

To align components on the shaft

Answer

To reduce vibrations

Question 20

Which type of gear system converts rotary motion into linear motion?

Accepted Answer

Helical gear and rack

Answer

Spur gear and pinion

Answer

Bevel gear and worm gear

Answer

Worm gear and pinion

Question 21

Which of the following is a common manufacturing process used to produce gears?

Accepted Answer

Milling

Answer

Casting

Answer

Forging

Answer

Injection molding

Question 22

What is the term used to describe the ratio between the number of teeth on a driving gear and the number of teeth on the driven gear in a gear train?

Accepted Answer

Gear ratio

Answer

Pitch diameter

Answer

Module

Answer

Pressure angle

Question 23

Which gear type combines high efficiency and low noise operation?

Accepted Answer

Helical gear

Answer

Spur gear

Answer

Bevel gear

Answer

Worm gear

Question 24

What's the primary purpose of a bearing in a mechanical system?

Accepted Answer

Reducing friction and wear

Answer

Transmitting power

Answer

Guiding motion

Answer

Storing energy

Question 25

Which is NOT a recognized type of bearing failure?

Accepted Answer

Tensile failure

Answer

Fatigue failure

Answer

Wear failure

Answer

Corrosion failure

Question 26

Differentiate between spur gears and helical gears:

Accepted Answer

Spur gears have straight teeth, while helical gears have angled teeth.

Answer

Spur gears exhibit lower efficiency compared to helical gears.

Answer

Helical gears offer superior strength compared to spur gears.

Answer

Spur gears are exclusively used in low-speed applications.

Question 27

Identify a type of rolling element bearing:

Accepted Answer

Ball bearing

Answer

Sleeve bearing

Answer

Thrust bearing

Answer

Needle bearing

Question 28

Which factor does NOT influence the power transmitted by a shaft?

Accepted Answer

Shaft alignment

Answer

Shaft diameter

Answer

Shaft speed

Answer

Material properties

Question 29

Identify the bearing type used to support radial loads:

Accepted Answer

Ball bearing

Answer

Thrust bearing

Answer

Sleeve bearing

Answer

Needle bearing

Question 30

When shafts are not parallel, which type of gear is employed?

Accepted Answer

Bevel gear

Answer

Spur gear

Answer

Helical gear

Answer

Worm gear

Question 31

Tapered roller bearings offer the main advantage of:

Accepted Answer

High load-carrying capacity

Answer

Low friction

Answer

Self-aligning capability

Question 32

Which bearing type accommodates misalignment between shafts?

Accepted Answer

Self-aligning ball bearing

Answer

Angular contact bearing

Answer

Tapered roller bearing

Answer

Deep groove ball bearing

Question 33

Repeated bending primarily causes which type of shaft failure?

Accepted Answer

Fatigue failure

Answer

Torsional failure

Answer

Overload failure

Answer

Corrosion failure

Question 34

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

Accepted Answer

To prevent relative rotation between the shaft and hub

Answer

To transmit axial loads

Answer

To reduce friction between the shaft and hub

Question 35

Which type of shaft is most suitable for transmitting power through a long distance with minimal deflection?

Accepted Answer

Hollow shaft

Answer

Solid shaft

Answer

Flexible shaft

Answer

Tapered shaft

Question 36

A clutch is used in a power transmission system to:

Accepted Answer

Engage and disengage power transmission

Answer

Increase torque

Answer

Change the direction of rotation

Answer

Reduce friction

Question 37

The critical speed of a shaft is the speed at which:

Accepted Answer

The shaft undergoes excessive vibrations

Answer

The shaft becomes too hot

Answer

The shaft breaks

Answer

The shaft loses its strength

Question 38

A shaft is subjected to a combination of bending and torsional loads. Which of the following factors should be considered when selecting the shaft material?

Accepted Answer

Yield strength and shear strength

Answer

Ductility only

Answer

Tensile strength only

Answer

Hardness only

Question 39

What is the purpose of a keyway on a shaft?

Accepted Answer

To provide a secure fit between the shaft and the mating component

Answer

To reduce friction between the shaft and the gear

Answer

To improve the shaft's aesthetic appearance

Answer

To increase the shaft's diameter

Question 40

Which of the following is NOT a factor influencing the life of a rolling element bearing?

Accepted Answer

Material of the housing

Answer

Lubrication

Answer

Load

Answer

Operating temperature

Question 41

In a belt drive system, what is the purpose of the belt tension?

Accepted Answer

To prevent slippage between the belt and pulleys

Answer

To reduce the load on the driving pulley

Answer

To increase the speed of the driven pulley

Question 42

A clutch is used in a mechanical system to:

Accepted Answer

Connect and disconnect power transmission

Answer

Reduce friction between moving parts

Answer

Increase the speed of the output shaft