Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

CHAPTER 5 AND 6 > CHAP 5 SHAFT, KEY, KEYWAYS 6 BEARINGS > Flashcards

CHAP 5 SHAFT, KEY, KEYWAYS 6 BEARINGS Flashcards

1
Q

Machine element that transmits torque and power.

A

Shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the three factors that affects the horsepower requirement of a shaft?

A

a. Torque
b. Rpm shaft
c. Peripheral velocity of shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Shaft delivers 10lbs at 10cm crank radius. What is the torque
delivered by the shaft?

A

45.45 kg-cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Shaft delivers 10lbs at 10cm crank radius. The shaft delivered a 45.45kg-cm and rotates at 80 rpm, what is its power delivered ?

A

0.05 Hp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Machine element used to fasten shaft pulleys and gear hubs together.

A

Keys

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In a design of drive shaft assembly, the weakest part is the

____.

A

Key

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Rule of thumb for the length of keyway based on the diameter of
the shaft.

A

1.5 of the diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A solid shaft delivers 1000 in.- lb torque at 800 rpm rotation, what shaft diameter would you recommend? Recommended design stress is 6,000 psi.

A

1 inch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What would you recommend for the biomass shredder’s shaft diameter if an engine delivers 10hp power in a shaft running at a speed of 1800 rpm? Consider a design stress for the shaft of 6000 psi.

A

0.66 in

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the recommended size of the shaft for the shredder in Item 9?.

A

¾ inches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

If two shafts are perpendicular with each other, what type of drive system would you recommend?

A

Flat belt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Grove that is placed on a shaft to prevent the pulley from slippage.

A

keyway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Type of key applicable for sliding-type shaft and hub assembly.

A

parallel key

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Give three types of key applicable for an assembly in which the hub is fastened to the shaft or an assembly in which the key is driven between the shaft and the hub.

A

Parallel key
Woodruff key
Taper key

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Rule of thumb for the width of keyway based on the diameter of shaft.

A

¼ the diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Rule of thumb for the depth of keyway based on the diameter.

A

1/8 the diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Recommended key cross-section for shaft below 5.5 in. is ____.

A

square

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Recommended key cross section for shaft above 5.5 in. is

____.

A

rectangular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Shaft with varying diameter along its length.

A

Stepper shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Shaft diameter is 30 mm. As an Agricultural Engineer, what size of square keyway would you recommend?

A

7.5 mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

All rotating parts of agricultural machines, as prescribed in the PAE Standards, should be ___.

A

dynamically balanced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

An axle of a power tiller was tested on a Prony-brake dynamometer. The force delivered at 1m brake arm was 300 kg at 25 rpm speed. Determine the torque.

A

300 kg-m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

A rotating member of a machine that is usually of circular crosssection used to transmit power and motion.

A

Shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Part of the machine which is subjected to torsion, bending, or combination of the load.

A

Shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

After the shaft size is computed, its diameter is often modified
IN WHAT WAY to fit the size of standard bearing?

A

UPWARD ONLY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

A continuous shaft with an input in one location and have several outputs on the same shaft.

A

Line Shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Standard shafts used for agricultural machines usually have a steel designation of what material?

A

AISI 1020 (Cold-Rolled Steel).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Stainless-steel shaft that is usually used for special purpose has to have a steel designation of?

A

304 or 316

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Recommended Distance Between Bearings (m) when the shaft size is 24-37 mm

A

1.83 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Recommended Distance Between Bearings (m) when the shaft size is 43-56 mm

A

2.44 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Recommended Distance Between Bearings (m) when the shaft size is 62-75 mm

A

3.05 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Recommended Distance Between Bearings (m) when the shaft size is 87-100 mm

A

3.66 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Recommended Distance Between Bearings (m) when the shaft size is 113-125 mm

A

4.27 m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

What is the formula in getting shaft horsepower when given T and N?

A

HP = T x N /63,000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What is the formula in getting shaft horsepower when given F and V?

A

HP = F x V / 33000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What is the formula for shaft diameter?

A

D = [16 T / (π Sd) ] ^ 1/3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

Shaft, pulley and hubs of gears are usually fastened together
by what?

A

keys

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

It used to prevent relative movement of rotating
members and the shaft or spindles to which they are
mounted.

A

Keys

39
Q

Keys whose longitudinal sides are parallel with each other

A

Parallel key

40
Q

A type of key with tapered longitudinal section.

A

Taper key

41
Q

A type of key with semi circular cross-section

A

Woodruff key

42
Q

What is the material used for the key?

A

AISI 1020.

43
Q

Tensile strength for the key should be?

A

393 MPa

44
Q

Permits relative motion of two parts in one or two directions with minimum friction while resisting motion in the direction of applied load.

A

Bearing

45
Q

Classifications of Bearings where in loads are pass through the
surfaces of the parts by sliding contact or separated by
lubricants.

A

Plain or Journal Bearing

46
Q

Classifications of Bearings where in loads are pass through the surfaces of the parts by rolling contact. It carries the load from a rotating shaft on balls or other types of rollers.

A

Anti-Friction or Rolling Bearing

47
Q

A bearing that develop a hydrodynamic pressure to carry the
loads and separate the bearing elements in order to minimize
friction.

A

PLAIN OR JOURNAL BEARING

48
Q

The bearing load per unit of projected area is _____
proportional to the viscosity of the lubricant and of the relative
speed of rotation and _____ proportional to the diametral
clearance.

A

directly, inversely

49
Q

Metallic or synthetic lining for a hole that reduces or prevents abrasion between components of the machine.

A

Bushing

50
Q

What type of bearing must be recommended to tighten the belt tension of a bucket elevator?

A

Take-up Unit bearing

51
Q

For hanger bearing of a screw conveyor, what type of bearing is recommended?

A

Journal Bearing

52
Q

Type of bearing excellent for heavy radial load and moderate thrust load.

A

Spherical roller bearing

53
Q

Type of bearing suitable for both radial and thrust loads.

A

Ball bearing

54
Q

Type of bearing with roller length at least 4 times than its diameter and is suitable for heavy load, oscillating and low speed.

A

Needle bearing

55
Q

Type of bearing used to restrain endwise motion of a turning shaft or to withstand an axial load.

A

Thrust bearing

56
Q

Bearing used for disk plow bottom.

A

Tapered-roller bearing

57
Q

Type of bearing suitable for heavy radial load and free from axial load.

A

Cylindrical-roller bearing

58
Q

True or falls? BALL BEARING operates at a LOWER speed limit than roller bearing.

A

FALSE : BALL BEARING operates at a HIGHER speed limit than roller bearing.

59
Q

A bearing is specified as 6204. The first number refers to ____ .

A

Type

60
Q

The second number in bearing specification, like 6204, refers to ____ .

A

Series

61
Q

The two remaining numbers in the bearing specification above refers to ___ .

A

Size

62
Q

What is the size of the bearing specified as 6204?

A

20 mm

63
Q

What type of bearing must be recommended to tighten the belt tension of a bucket elevator?

A

Take-up Unit bearing

64
Q

If a bearing has a designated specification of P206, what size of shaft is suitable for the bearing.

A

1¼ inches

65
Q

Commercially-available ball bearings are designated as P305. What is does the letter indicate?

A

Type of bearing housing

66
Q

What is the type of housing for P305 bearing?

A

Pillow block

67
Q

What is the size of the bearing designated as P305?

A

30mm

68
Q

Plain bearings used in agricultural machines usually have ____ lubrication.

A

thin

69
Q

Is is the commonly used plain bearing in agricultural machines which has the ability to conform to misalignment; resist corrosion; and against steel without scouring.

A

babbit-metal bushing

70
Q

give atleast two advantages of plain bearing

A
  • Little or no service requirements
  • Lower cost
  • Greater tolerances
  • No elaborate enclosure requirement
71
Q

A bearing that utilizes the rolling action of a number of balls
or other elements between two rings in order to reduce the
friction and prolong their lives.

A

Roller-contact Bearing

72
Q

Chrome Steel, Chrome Molybdenum, and Nickel Chrome

Molybdenum Steel are material bearings used for bearings for general use. TRUE or FALSE?

A

FALSE - for bearings that are subjected to very severe shock
load

High Carbon Bearing Steel is the usual material For general use

73
Q

The raceway grooves on both the inner and outer rings have circular area of slightly larger radius than that of the balls.

A

Single-Row Deep-Groove Ball Bearings

74
Q

• Capable of taking radial and thrust loads in one direction.
• Contact angles available are 15, 30, and 40 deg. Larger
contact angle, higher thrust load capability. High speed
operation requires low contact angle.

A

Single-Row Angular-Contact Bearings

75
Q

• Only minor angular misalignment of the shaft in relation
to the bearing housing is allowed.
• This type of bearing with tapered bore is often mounted
using an adapter sleeve

A

Self-Aligning Ball Bearings

76
Q

• The rollers are in linear contact with the raceway.
• Has large radial load capacity and is suitable for use in high
speeds.

A

Cylindrical Roller Bearings

77
Q

• Has large number of long rollers with length-to-diameter
ratio of 3 to 10.
• Suitable for condition where there is limited space.
• Has large radial load capacity.

A

Needle Roller Bearings

78
Q

Capable of taking both radial and thrust loads in one

direction.

A

Tapered Roller Bearings

79
Q

It is a self-aligning type of bearing due to it shape that is spherical.

A

Spherical Roller Bearings

80
Q

It is brought about by shaft deflection resulting from applied load, shaft and housing inaccuracy, and bearing mounting alignment.

A

Angular misalignment

81
Q

Load support is perpendicular with the axis of the rotation of the shaft

A

Radial Load

82
Q

Load support is parallel with the axis of rotation of the shaft

A

Thrust load

83
Q

what is the formula for calculating torque for bearings?

A

T = 9.74 x 10^5 Pt / N

T - torque, kgf-mm
Pt - power transmitted, kW
N - shaft speed, rpm

84
Q

What is the formula for solving the effective force for bearing?

A

Fe = T / r

Fe - effective force belt or chain or tangential
force of gears, kgf
T - torque, kgf-mm
r - effective radius of pulley or sprocket
or pitch circle diameter of gear, mm

85
Q

What is the formula for in solving the actual load for bearing?

A

Fa = fd x Fe

Fa - actual force or load transmitted, kgf
fd - drive factor, dmls
Fe - effective force transmitted, kgf

86
Q

Bearing life formula for ball bearings

A

Lr = (C/P)^3

87
Q

Bearing Life formula for roller Bearings

A

Lr = (C/P)^3.33

88
Q

formula for rating life (h) of ball bearings

A

Lh = (k/N) ^ 0.33 x Lr

Lh - rating life, hours
Lr - rating fatigue life, 106 rev
N - bearing speed, rpm
k - speed factor equal to 3.33 for NSK
bearing while 16,666.7 for Link Belt
89
Q

formula for rating life (h) of ball bearings

A

Lh = (k/N)^0.33 x Lr

90
Q

TRUE OR FALSE

Grease is used when: The temperature is not over 93°C
Oil is used when: The temperature is over 93°C

A

TRUE AND TRUE

91
Q

TRUE OR FALSE

Grease is used when: Speed is low
Oil is used when: Speed is high

A

TRUE AND TRUE

92
Q

TRUE OR FALSE

Grease is used when: Unusual protection is required from
the entrance of debris

Oil is used when: Oil tight seals are readily employed

A

TRUE AND TRUE

93
Q

TRUE OR FALSE

Grease is used when: Simple bearing seals are desired
Oil is used when: Bearing type is not suitable for
grease

A

TRUE AND TRUE

94
Q

TRUE OR FALSE

Grease is used when: Operation for long periods without
attention is desired
Oil is used when: The bearing is lubricated from a
central supply that is also used for
other machine parts

A

TRUE AND TRUE

CHAPTER 5 AND 6 (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions