M3.2

Question 1

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

Answer 1

B

Question 2

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

Answer 2

D

Question 3

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

Answer 3

C

Question 4

) 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

Answer 4

D

Question 5

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

Answer 5

C

Question 6

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

Answer 6

C

Question 7

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

Answer 7

D

Question 8

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

Answer 8

C

Question 9

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

Answer 9

C

Question 10

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

Answer 10

D

Question 11

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

Answer 11

D

Question 12

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

Answer 12

B

Question 13

) 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

Answer 13

B

Question 14

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

Answer 14

D

Question 15

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

Answer 15

A

Question 16

) 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

Answer 16

D

Question 17

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

Answer 17

C

Question 18

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

Answer 18

B

Question 19

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

Answer 19

A

Question 20

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

Answer 20

D

Question 21

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

Answer 21

C

Question 22

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

Answer 22

B

Question 23

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

Answer 23

A

Question 24

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

Answer 24

A

Question 25

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

Answer 25

A

Question 26

) 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

Answer 26

D

Question 27

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

Answer 27

B

Question 28

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

Answer 28

A

Question 29

) 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

Answer 29

B

Question 30

) 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

Answer 30

B

Question 31

) 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 °

Answer 31

B

Question 32

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

Answer 32

D

Question 33

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

Answer 33

C

Question 34

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

Answer 34

C

Question 35

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

Answer 35

A

Question 36

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

Answer 36

B

Question 37

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

Answer 37

C

Question 38

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

Answer 38

B

Question 39

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

Answer 39

D

Question 40

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

Answer 40

C

Question 41

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

Answer 41

D

Question 42

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

Answer 42

B

Question 43

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

Answer 43

D

Question 44

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

Answer 44

B

Question 45

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

Answer 45

C

Question 46

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

Answer 46

A

Question 47

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

Answer 47

C

Question 48

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

Answer 48

C

Question 49

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

Answer 49

B

Question 50

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

Answer 50

B

Question 51

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

Answer 51

B

Question 52

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

Answer 52

C

Question 53

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

Answer 53

C