Machine Elements: Interactive Learning Quizzes for Engineering Design

Question 1

When designing a shaft for a specific application, what are the key factors to consider?

Accepted Answer

Material, loading conditions, shaft dimensions, and manufacturing process

Answer

Material, loading conditions, and shaft dimensions

Answer

Loading conditions, shaft dimensions, and manufacturing process

Answer

Loading conditions, shaft dimensions, manufacturing process, and cost

Question 2

Which of the following is NOT a type of gear used in mechanical systems?

Accepted Answer

Chain drive

Answer

Spur gear

Answer

Bevel gear

Answer

Worm gear

Question 3

What is the primary function of a bearing in a machine?

Accepted Answer

To provide support to rotating shafts and reduce friction

Answer

To transmit power between shafts

Answer

To convert rotary motion to linear motion

Answer

To absorb shock and vibration

Question 4

What is the purpose of a helical spring in a mechanical system?

Accepted Answer

To provide a restoring force

Answer

To store energy

Answer

To absorb shock

Answer

To transmit power

Question 5

Which of the following is a key characteristic of a self-locking nut?

Accepted Answer

It prevents loosening due to vibration

Answer

It can be tightened by hand

Answer

It is made of a soft material

Answer

It has a low profile

Question 6

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

Accepted Answer

To prevent relative rotation

Answer

To transmit torque

Answer

To adjust the spacing between shaft and hub

Answer

To provide structural support

Question 7

Two gears are meshed together. One gear has 20 teeth, and the other has 40 teeth. What is the gear ratio between the two gears?

Accepted Answer

1:2

Answer

2:1

Answer

1:1

Answer

4:1

Question 8

Which of the following is not a type of gear?

Accepted Answer

Chain

Answer

Spur gear

Answer

Helical gear

Answer

Bevel gear

Question 9

Which type of gear is most suitable for transmitting power between non-parallel, intersecting shafts?

Accepted Answer

Bevel gear

Answer

Spur gear

Answer

Helical gear

Answer

Worm gear

Question 10

What is the primary function of a bearing in a machine?

Accepted Answer

To minimize friction between two surfaces in contact

Answer

To transmit power from one component to another

Answer

To absorb shock and vibration

Answer

To provide structural support

Question 11

What is the main advantage of using helical gears over spur gears?

Accepted Answer

Smoother and quieter operation

Answer

Higher load capacity

Answer

Ability to transmit power between parallel shafts

Answer

Lower cost

Question 12

Which type of shaft is primarily used to transmit power from one component to another?

Accepted Answer

Solid shaft

Answer

Hollow shaft

Answer

Stepped shaft

Answer

Flexible shaft

Question 13

Which type of bearing is most commonly used in high-speed applications due to its low friction and high precision?

Accepted Answer

Ball bearing

Answer

Roller bearing

Answer

Needle bearing

Answer

Plain bearing

Question 14

What is the purpose of a keyway in a shaft?

Accepted Answer

To transmit torque

Answer

To prevent axial movement

Answer

To align components

Answer

To reduce vibration

Question 15

Which of the following is NOT a fundamental machine element discussed in this unit?

Accepted Answer

Electric motors

Answer

Gears

Answer

Bearings

Answer

Shafts

Question 16

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

Accepted Answer

To reduce friction and wear between moving parts

Answer

To transmit power or motion

Answer

To store energy and release it gradually

Answer

To convert one type of motion to another

Question 17

Which type of gear is specifically designed to transmit motion between shafts that are parallel to each other?

Accepted Answer

Spur gear

Answer

Bevel gear

Answer

Worm gear

Answer

Hypoid gear

Question 18

Which material is commonly used for the races (inner and outer rings) of ball or roller bearings?

Accepted Answer

Hardened steel with high wear resistance

Answer

Bronze or brass for their low friction properties

Answer

Ceramic for its excellent heat resistance

Answer

Carbon fibre for its lightweight and strength

Question 19

What is the fundamental difference between a plain bearing and a rolling-element bearing?

Accepted Answer

Plain bearings use滑动摩擦(sliding friction) while rolling-element bearings use滚动摩擦(rolling friction)

Answer

Rolling-element bearings can handle higher loads than plain bearings

Answer

Plain bearings are more compact and require less space than rolling-element bearings

Answer

Plain bearings are typically used for high-speed applications, while rolling-element bearings are used for low-speed applications

Question 20

What is the specific purpose of a thrust bearing in a machine system?

Accepted Answer

To support and carry axial loads parallel to the shaft axis

Answer

To support and carry radial loads perpendicular to the shaft axis

Answer

To reduce friction between rotating and stationary surfaces

Answer

To transmit torque and power between shafts

Question 21

Which type of gear has teeth cut on the inside surface of a cylinder?

Accepted Answer

Internal gear

Answer

External gear

Answer

Bevel gear

Answer

Worm gear

Question 22

What is the primary function of a thrust bearing?

Accepted Answer

Support axial loads

Answer

Support radial loads

Answer

Reduce friction between rotating shafts

Answer

Prevent shaft misalignment

Question 23

Which shaft material offers a combination of high strength and wear resistance?

Accepted Answer

Alloy steel

Answer

Stainless steel

Answer

Titanium

Answer

Aluminum

Question 24

Which type of load is applied perpendicular to the shaft axis?

Accepted Answer

Radial load

Answer

Torsional load

Answer

Axial load

Question 25

What is the main purpose of keyways in shafts?

Accepted Answer

Transmit torque from one component to another

Answer

Reduce friction between contacting surfaces

Answer

Prevent shaft rotation

Answer

Support bearings

Question 26

Which of the following is a type of rolling-element bearing?

Accepted Answer

Ball bearing

Answer

Plain bearing

Answer

Hydrostatic bearing

Answer

Magnetic bearing

Question 27

What is the primary function of a shear pin in a mechanical system?

Accepted Answer

Protect components from damage during excessive torque

Answer

Transmit torque from one shaft to another

Answer

Support bearings