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MACHINE DESIGN 2 (OT TERMS) Flashcards

1
Q

All stresses produced in a belt are __.

A

tensile stresses

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2
Q

For a steel pulley of 500 mm in diameter, the recommended number of spokes is –

A

6

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3
Q

The centrifugal tension in the belt

A

has no effect on the power transmitted

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4
Q

The effective turning force at the circumference of a driven pulley is the ___.

A

net belt pull

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5
Q

It is a slight absolute motion of the belt as it passes over the pulleys.

A

Creep of belt

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6
Q

In a chain drive system, the __ on the driven shaft will increase as the sprocket ratio increases.

A

Torque

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7
Q

The speed reduction of a single stage chain drive should not be more than ___.

A

7:1

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8
Q

It is the main contributor in the existence of shock load in chain drives.

A

velocity variation

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9
Q

What is the pitch of RC 41 chain?

A

12.7 mm

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10
Q

It is the term used to describe the occurrence of twist or curl in rope and chain caused by its doubling or bending upon itself.

A

Kinking

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11
Q

.In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for high speeds, should be

A

21

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12
Q

The maximum shear force required for punching depends on __.

A

inversely proportional to their diameters

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13
Q

Compared to a v-belt drive, a chain drive _ .

A

is more efficient

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14
Q

It is recommended that for a multiple strand V-belt drive, when one of the belt breaks, the whole set of belts should be replaced. Which of the following is the best justification for this?

A

All in the list

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15
Q

Which is not a part of the roller chain?

A

center link plate

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16
Q

The three basic components of a chain drive are ___.

A

chain, driver sprocket, and driven sprocket

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17
Q

The braking torque depends upon ___.

A

all in the list

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18
Q

The minimum number of driven pulleys for the simplest compound belt drive is __.

A

2

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19
Q

The simplest compound belt drive consists of how many shafts?

A

3

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20
Q

Which of the following factor(s) contribute to the effectiveness of the brakes?

A

All of the above

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21
Q

The maximum shear force required for punching depends on __.

A

sheared area

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22
Q

When the torque required by the machine is more than the torque supplied by the motor, the flywheel is ___.

A

retarded

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23
Q

Babbit is used as __.

A

all in the list

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24
Q

In order to find the maximum bending moment on the arms, it is assumed as a ___.

A

cantilever beam fixed at the hub and carrying a concentrated load at the free end of the rim

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25
Load acting on bearing in its plane of rotation is called as
radial load
26
Disc clutch, the clutch disc acts as a ___.
Driven member
27
The bearings of heavy series have capacity __ over the medium series.
20-30
28
Chain drive is intermediate between __.
rope and gear
29
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be ___ the bearing modulus.
15 times
30
The bearing characteristic number in a hydrodynamic bearing depends upon
viscosity, speed, and bearing pressure
31
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
axial pitch
32
The flywheel is accelerated when ___.
Driving torque > Load torque
33
The ball bearings are provided with a cage __.
To maintain the balls at a fixed distance apart
34
The contact ratio for gears is __
greater than 1
35
The load carrying ability of a __results when the journal and/or the bearing rotates relative to the load.
Wedge film bearing
36
It is the force per unit area required to move a surface at unit velocity, when it is separated by a fluid of unit thickness from a stationary surface.
absolute viscosity
37
An advantage of the __ is that the adjustment of center distance of chain drive may be in units of one link instead of a pair of links
offset
38
It is the path traced by the point of contact of two teeth from the beginning to the end of engagement.
Path of contact
39
It is the depth of a gear tooth space below the pitch line or circle
Dedendum
40
The allowable static stress for steel gears is approximately __ of the ultimate tensile stress.
one third
41
The size of a gear is usually specified by ___.
pitch circle diameter
42
It is the locus of a point on a straight line which rolls, without slipping, on the circumference of a circle, or alternatively the locus of a point on the chord which is held tauted and unwound from a cylinder.
Involute
43
The two major categories of bearings used in industry are _.
plain and anti-friction
44
If the groove is bigger than rope, there will not be sufficient support for the rope which may, therefore, flatten from its normal circular shape and increase
fatigue effects
45
The clearance or amount of movement between the tooth profiles of a pair or train of gears in mesh is called _.
Backlash
46
In angular contact bearings, __ bearings are required to take thrust load in both directions.
2
47
The value of Lewis form factor used in design of gears is ___.
All in the list
48
Which of the following terms does not refer to the arc of contact between the belt and the pulley?
Angle of articulation
49
The cross-section of a V-belt is 40 mm wide at the top, 20 mm wide at the bottom and 25 mm deep. Calculate its cross-sectional area.
Type C
50
A belt drive is desired to have a center distance between pulleys of approximately 7.5 m. What is the appropriate type of belt to be used for this application?
Flat belt only
51
For a flat belt drive, the face of the leather belt in contact with the surface of the pulley is the hair side. Which of the following does not justify this statement?
the hair side has higher coefficient of friction
52
When the pulley with a given initial tension starts rotating, the tension in the belt ___.
Decreases on the slack side
53
Fiber ropes make contact at _.
the sides of the groove of the pulley
54
What is the recommended maximum center distance for twisted belt drive in terms of the width of the belt, b in order to minimize wear and tear of the belt?
20b
55
Which of the following belt joints has the lowest joint efficiency?
Metal hinged joint
56
The groove angle of the pulley for V-belt drive is usually
32° – 38°
57
The following are the advantages in using a cross belt drive except _
Opposite pulley rotation
58
The ultimate tensile breaking load (in kN) of cotton ropes in terms of its girth c in mm is approximately _.
35.5c^2
59
This type of belt drive makes it possible to change the speed of the driven shaft where the driven pulley is mounted while maintaining the speed of the driving shaft constant.
Stepped pulley drive
60
It is recommended that for a multiple strand V-belt drive, when one of the belt breaks, the whole set of belts should be replaced. Which of the following is the best justification for this?
All of these
61
The recommended maximum belt speed in ft/s for crossed belt drive is
49
62
To loose a chain causes a vibration known as ___.
Whipping
63
Which of the following is the most general term?
Drum
64
These chains are used for elevating and conveying the materials continuously at a speed up to 2 m/s.
Conveyor Chain
65
In this popular wire rope, the wires in the two adjacent strands are twisted in the opposite direction.
Composite or Reverse Laid Ropes
66
Larger arc of contact between the chain and the sprocket ensures _.
All in the list
67
The useful life of power transmitting chains is usually terminated by _.
troubles arising from wear at the joints
68
IWRC, compared to hemp core, is high-temperature resistant, has about _ greater strength and has smaller elongation under load.
7.5
69
The power rating of the roller chain is obtained on the basis of what failure criteria?
All in the list
70
In a chain drive system, the speed of the driven shaft will decrease as the _ increases
Sprocket ratio
71
In roller chain, the bush and the pin form __.
Swivel
72
It is a stick slip phenomenon between the pin and the bushing.
Galling
73
Which is the most commonly recommended material for medium service for wire rope sheaves?
Cast iron
74
Chain drives are recommended to transmit power up to __kW.
100

CORREL (24 decks)

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