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IKING 2 > M3.2 > Flashcards

M3.2 Flashcards

1
Q

For better mounting of bearing, it is
preferred to heat the inner ring the range of 200 °F and ____
°F as overheating might reduce the ring hardness.
A. 280 C. 300
B. 250 D. 320

A

B

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2
Q

Which of the following safety
precautions should be followed when pouring babbitt?
A. Operator must wear goggles
B. The surface to be babbitted must be free of moisture
C. The surface to be babbitted must be clean
D. All the above

A

D

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3
Q

Babbitt metal is used primarily in:
A. Ball bearings C. Sleeve bearings
B. Roller bearings D. Thermocouples

A

C

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4
Q

) Water, even a few drops on molten
babbitt in a large bearing will cause:
A. Metal shrinks C. Rough surface
B. Non-fusion D. Cracks

A

D

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5
Q

This is a bearing material with low
coefficient of friction, resistance to any chemical, selflubricated and can be utilized in a wide temperature range.
C. Stainless steel C. Teflon® (PTFE)
D. Cast iron D. Chromium

A

C

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6
Q

) The major element/component of a
Babbitt metal is:
A. Antimony C. Tin
B. Lead D. Zinc

A

C

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7
Q

The rule of thumb in journal
bearing design, the clearance ratio should be:
A. 0.01001 C. 0.0101
B. 0.0110 D. 0.0010

A

D

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8
Q

A type
of journal bearing known as eccentrically loaded bearing.
A. Fired bearing C. Offset bearing
B. Full beating D. Partial bearing

A

C

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9
Q

A type of bearing which totally enclosed
the shaft.
A. Babbitt bearing C. Full bearing
B. Central bearing D. Offset bearing

A

C

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10
Q

The purpose of these parts in application
are to have better bearings to seal the guard against marring,
etc.
A. Journal bearings C. Shaft seals
B. Metallic seals D. Washers

A

D

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11
Q

of the following is considered advantageous
for bearing materials?
A. Conformability C. Embeddability
B. Compatibility D. All of these

A

D

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12
Q

What is the line that passes through the
centers of the bearing and the journals?
A. Line of action C. Line of symmetry
B. Line of centers D. Tangent line

A

B

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13
Q

) When line of action of the load bisects the arc
of partial bearing, the bearing is said to be:
A. Eccentrically loaded C. Fully loaded
B. Centrally loaded D. Partially loaded

A

B

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14
Q

Which of the following would cause hot
bearings?
A. Dirt in oil C. Improper oil
B. Improper alignment D. All of these

A

D

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15
Q

This refers to the thickness of the space
allowed for the lubricant that separates the parts having
relative motion.1
A. Clearance C. Film Thickness .
B. Diametral Clearance D. Radial Clearance

A

A

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16
Q

) It is the difference in the radii of the bearing
and the journal
A. Clearance ratio C. Fit clearance
B. Even clearance D. Radii clearance

A

D

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17
Q

A bearing lubrication obtained by introducing
the lubricant, which is sometimes air or water, into the loadbearing area at a pressure high enough to separate the
surfaces with a relatively thick film of lubricant. This
lubrication does not require motion of one surface relative to
another.
A. Boundary lubrication C. Hydrostatic lubrication
B. Hydrodynamic lubrication D. Solid film lubrication

A

C

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18
Q

A journal bearing where the radius of the
journal is less than the radius of the bushing or bearing.
A. Fitted journal bearing C. Full journal bearing
B. Clearance journal bearing D. Partial journal bearing

A

B

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19
Q

A partial journal bearing where the line of
action of the load or bearing reaction is bisecting the arc of
the partial bearing.
A. Centrally loaded bearing C. Fully loaded bearing
B. Eccentrically loaded bearing D. Partially loaded bearing

A

A

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20
Q

A journal bearing with angle of contact of the
bushing or bearing with the journal is 180° or less, 120° is the
common value.
A. Clearance journal bearing C. Full journal bearing
B. Concentric journal bearing D. Partial journal bearing

A

D

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21
Q

A ______ is formed when a shaft rotates in a
bush, lines of the bore of a housing.
A. Ball bearing C. Plain bearing
B. Needle bearing D. Roller bearing

A

C

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22
Q

A journal bearing where the radii of the
journal and the bushing are equal; it must be partial bearing
and the journal must run eccentric with the bushing in order
to provide space for the lubricant.
A. Clearance journal bearing C. Full journal bearing
B. Fitted journal bearing D. Partial journal bearing

A

B

23
Q

The type and number of bearings to be used
for spindles of machine tool depend on the:
A. Load on bearing C. Type of spindle
B. Type of machine tool D. None of these

A

A

24
Q

A low-cost bearing used worldwide for
automobile or low horsepower motor application. It is made
of thin coating of over flat metal strip.
A. Babbitt C. Cadmium brass
B. Lead D. Tin

A

A

25
Q

The property of the bearing material to yield
and adopt its shape to that of journalix
.
(A) Conformability C. Endurance limit stress
(B) Embeddability D. Viscosity

A

A

26
Q

) Which of the following is not a function of
bearings?
A. To give free rotation to the shaft
B. To guide the shaft
C. To support the shaft
D. To transmit power

A

D

27
Q

A conclusion repeatedly verified by
experiment is that the smoother the surface.
A. Constant
B. The greater the load capacity of the bearing
C. The lesser the capacity of the bearing
D. None of these

A

B

28
Q

The length-diameter ratio of a journal bearing
is a good compromise for the general case of hydrodynamic
bearings is approximately equal to:
A. 1 C. 3
B. 2 D. 4

A

A

29
Q

) A journal bearing where the line of action of
the load is passing to one side of the center.
A. Centrally loaded bearing
B. Eccentrically loaded bearing
C. Fully loaded bearing
D. Partially loaded bearing

A

B

30
Q

) It is one in which the radii of the journal and
the bearing are the same ______.
A. Clearance bearing C. Full bearing
B. Fitted bearing D. Partial bearing

A

B

31
Q

) Babbit bearing material maybe melted in a
pouring ladle over an open fire. The temperature is about
right when a wooden pine stick used for stirring chars but
does not ignite and at that stage the molten metal
temperature is in the vicinity of:
A. 1010 °F C. 760 °F
B. 870 °F D. 590 °

A

B

32
Q

At higher temperature, the oil oxidizes more
rapidly above
A. 120 °F C. 160 °F
B. 140 °F D. 200 °F

A

D

33
Q

A hydrostatic bearing is the one in which:
A. Bearing is lightly loaded
B. Lube oil is not pressurized
C. Lube oil is supplied under pressure
D. There is no lube oil

A

C

34
Q

A hydrostatic bearing is the one in which:
A. Bearing is lightly loaded
B. Lube oil is not pressurized
C. Lube oil is supplied under pressure
D. There is no lube oil

A

C

35
Q

What bearing is made use of in the horizontal shaft
machines?
A. Plain bearing b. Thrust bearing
B. Push bearing d. Throw bearing

A

A

36
Q

The ability of the bearing material to entrap and sink beneath
the surface small foreign particles (dirt, debris, dust, abrasive
residuals) circulating in the lubricating oil.
A. Conformability C. Endurance limit stress
B. Embeddability D. Viscosity

A

B

37
Q

Also called eccentrically loaded bearing is:
A. Fitted bearings C. Offset bearing
B. Full bearings D. Partial bearing

A

C

38
Q

Normal values of specific gravity for sleeve-bearing lubricants
range from 0.75 to 0.95 at:
A. 40 deg. F C. 80 deg. F
B. 60 deg. F D. 100 deg. F

A

B

39
Q

n automotive practice, oil temperatures of journal bearings
of some _____ occur.
A. 200 °F C. 300 °F
B. 250 °F D. 350 °F

A

D

40
Q

Which of the following is not a type of failure in journal
bearing?
A. Abrasive wear C. Pitting
B. Corrosion D. Distortion

A

C

41
Q

The Petroff’s equation assumed that the lubricant film is:
A. Converging C. Non-Uniform
B. Diverging D. Uniform

A

D

42
Q

The operating temperature of a sliding/journal bearing
should be kept below _____ if possible.
A. 120°F C. 160°F
B. 140°F D. 180°F

A

B

43
Q

In journal bearings, what is the direction of the load on the
shaft axis?
A. 45° to the axis C. Axial
B. 60° to the axis D. Perpendicular

A

D

44
Q

In bushed journal bearings, the material used to make the
bush is:
A. Hard materials C. High carbon steel
B. Heat treated steel D. Soft materials

A

B

45
Q

Long shafts which need bearings for support but cannot be
fit from the end. Then which of the following is used?
A. Bracket bearings C. Plummer block
B. Bushed journal bearings D. Solid journal bearings

A

C

46
Q

Transmission or line shafts that run near a wall or pillars,
requires:
A. Bracket and hanger bearings
B. Bushed journal bearings
C. Footstep bearing
D. Solid journal bearing

A

A

47
Q

A hydrostatic bearing is the one in which ________.
E. Bearing is lightly loaded
F. Lube oil is not pressurized
G. Lube oil is supplied under pressure
H. There is no lube oil

A

C

48
Q

Which one of the following bearings is made in two halves
and assembled in a special plumber block?
A. Solid bearings C. Split bearings
B. Adjustable slide bearing D. Self-aligning bushing

A

C

49
Q

A bearing supports the load acting perpendicular to the axis
of the shaft.
A. Thrust C. Longitudinal
B. Radial D. Transversal

A

B

50
Q

The operating temperature of a sleeve/sliding/journal/
bushing should be kept below _____ if possiblexi
.
A. 130°F C. 150 °F
B. 140 °F D. 160 °F

A

B

51
Q

The L/D ratio of bearing for machine toolsxii is _____.
A. 1.5 to 3.5 C. 2.5 to 4.5
B. 2.0 to 4.0 D. 3.0 to 5.0

A

B

52
Q

The allowable bearing pressure for main bearingsxiii (marine
application) is _____.
A. 200-400 psi C. 400-600 psi
B. 300-500 psi D. 500-700 psi

A

C

53
Q

When an oil is heated to above _____, its viscosity changes
abruptly, and oxidation occursxiv
.
A. 135°F C. 155 °F
B. 145 °F D. 165 °F

A

C

IKING 2 (10 decks)

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