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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

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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

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3
Q

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

A

45.45 kg-cm

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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

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5
Q

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

A

Keys

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6
Q

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

____.

A

Key

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7
Q

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

A

1.5 of the diameter

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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

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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

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10
Q

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

A

¾ inches

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11
Q

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

A

Flat belt

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12
Q

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

A

keyway

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13
Q

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

A

parallel key

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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

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15
Q

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

A

¼ the diameter

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16
Q

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

A

1/8 the diameter

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17
Q

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

A

square

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18
Q

Recommended key cross section for shaft above 5.5 in. is

____.

A

rectangular

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19
Q

Shaft with varying diameter along its length.

A

Stepper shaft

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20
Q

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

A

7.5 mm

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21
Q

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

A

dynamically balanced

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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

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23
Q

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

A

Shaft

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24
Q

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

A

Shaft

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25
After the shaft size is computed, its diameter is often modified IN WHAT WAY to fit the size of standard bearing?
UPWARD ONLY
26
A continuous shaft with an input in one location and have several outputs on the same shaft.
Line Shaft
27
Standard shafts used for agricultural machines usually have a steel designation of what material?
AISI 1020 (Cold-Rolled Steel).
28
Stainless-steel shaft that is usually used for special purpose has to have a steel designation of?
304 or 316
29
Recommended Distance Between Bearings (m) when the shaft size is 24-37 mm
1.83 m
30
Recommended Distance Between Bearings (m) when the shaft size is 43-56 mm
2.44 m
31
Recommended Distance Between Bearings (m) when the shaft size is 62-75 mm
3.05 m
32
Recommended Distance Between Bearings (m) when the shaft size is 87-100 mm
3.66 m
33
Recommended Distance Between Bearings (m) when the shaft size is 113-125 mm
4.27 m
34
What is the formula in getting shaft horsepower when given T and N?
HP = T x N /63,000
35
What is the formula in getting shaft horsepower when given F and V?
HP = F x V / 33000
36
What is the formula for shaft diameter?
D = [16 T / (π Sd) ] ^ 1/3
37
Shaft, pulley and hubs of gears are usually fastened together by what?
keys
38
It used to prevent relative movement of rotating members and the shaft or spindles to which they are mounted.
Keys
39
Keys whose longitudinal sides are parallel with each other
Parallel key
40
A type of key with tapered longitudinal section.
Taper key
41
A type of key with semi circular cross-section
Woodruff key
42
What is the material used for the key?
AISI 1020.
43
Tensile strength for the key should be?
393 MPa
44
Permits relative motion of two parts in one or two directions with minimum friction while resisting motion in the direction of applied load.
Bearing
45
Classifications of Bearings where in loads are pass through the surfaces of the parts by sliding contact or separated by lubricants.
Plain or Journal Bearing
46
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.
Anti-Friction or Rolling Bearing
47
A bearing that develop a hydrodynamic pressure to carry the loads and separate the bearing elements in order to minimize friction.
PLAIN OR JOURNAL BEARING
48
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.
directly, inversely
49
Metallic or synthetic lining for a hole that reduces or prevents abrasion between components of the machine.
Bushing
50
What type of bearing must be recommended to tighten the belt tension of a bucket elevator?
Take-up Unit bearing
51
For hanger bearing of a screw conveyor, what type of bearing is recommended?
Journal Bearing
52
Type of bearing excellent for heavy radial load and moderate thrust load.
Spherical roller bearing
53
Type of bearing suitable for both radial and thrust loads.
Ball bearing
54
Type of bearing with roller length at least 4 times than its diameter and is suitable for heavy load, oscillating and low speed.
Needle bearing
55
Type of bearing used to restrain endwise motion of a turning shaft or to withstand an axial load.
Thrust bearing
56
Bearing used for disk plow bottom.
Tapered-roller bearing
57
Type of bearing suitable for heavy radial load and free from axial load.
Cylindrical-roller bearing
58
True or falls? BALL BEARING operates at a LOWER speed limit than roller bearing.
FALSE : BALL BEARING operates at a HIGHER speed limit than roller bearing.
59
A bearing is specified as 6204. The first number refers to ____ .
Type
60
The second number in bearing specification, like 6204, refers to ____ .
Series
61
The two remaining numbers in the bearing specification above refers to ___ .
Size
62
What is the size of the bearing specified as 6204?
20 mm
63
What type of bearing must be recommended to tighten the belt tension of a bucket elevator?
Take-up Unit bearing
64
If a bearing has a designated specification of P206, what size of shaft is suitable for the bearing.
1¼ inches
65
Commercially-available ball bearings are designated as P305. What is does the letter indicate?
Type of bearing housing
66
What is the type of housing for P305 bearing?
Pillow block
67
What is the size of the bearing designated as P305?
30mm
68
Plain bearings used in agricultural machines usually have ____ lubrication.
thin
69
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.
babbit-metal bushing
70
give atleast two advantages of plain bearing
- Little or no service requirements - Lower cost - Greater tolerances - No elaborate enclosure requirement
71
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.
Roller-contact Bearing
72
Chrome Steel, Chrome Molybdenum, and Nickel Chrome | Molybdenum Steel are material bearings used for bearings for general use. TRUE or FALSE?
FALSE - for bearings that are subjected to very severe shock load High Carbon Bearing Steel is the usual material For general use
73
The raceway grooves on both the inner and outer rings have circular area of slightly larger radius than that of the balls.
Single-Row Deep-Groove Ball Bearings
74
• 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.
Single-Row Angular-Contact Bearings
75
• 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
Self-Aligning Ball Bearings
76
• The rollers are in linear contact with the raceway. • Has large radial load capacity and is suitable for use in high speeds.
Cylindrical Roller Bearings
77
• 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.
Needle Roller Bearings
78
Capable of taking both radial and thrust loads in one | direction.
Tapered Roller Bearings
79
It is a self-aligning type of bearing due to it shape that is spherical.
Spherical Roller Bearings
80
It is brought about by shaft deflection resulting from applied load, shaft and housing inaccuracy, and bearing mounting alignment.
Angular misalignment
81
Load support is perpendicular with the axis of the rotation of the shaft
Radial Load
82
Load support is parallel with the axis of rotation of the shaft
Thrust load
83
what is the formula for calculating torque for bearings?
T = 9.74 x 10^5 Pt / N T - torque, kgf-mm Pt - power transmitted, kW N - shaft speed, rpm
84
What is the formula for solving the effective force for bearing?
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
What is the formula for in solving the actual load for bearing?
Fa = fd x Fe Fa - actual force or load transmitted, kgf fd - drive factor, dmls Fe - effective force transmitted, kgf
86
Bearing life formula for ball bearings
Lr = (C/P)^3
87
Bearing Life formula for roller Bearings
Lr = (C/P)^3.33
88
formula for rating life (h) of ball bearings
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
formula for rating life (h) of ball bearings
Lh = (k/N)^0.33 x Lr
90
TRUE OR FALSE Grease is used when: The temperature is not over 93°C Oil is used when: The temperature is over 93°C
TRUE AND TRUE
91
TRUE OR FALSE Grease is used when: Speed is low Oil is used when: Speed is high
TRUE AND TRUE
92
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
TRUE AND TRUE
93
TRUE OR FALSE Grease is used when: Simple bearing seals are desired Oil is used when: Bearing type is not suitable for grease
TRUE AND TRUE
94
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
TRUE AND TRUE

CHAPTER 5 AND 6 (1 decks)

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