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Discussion
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Mechanical Engineering
‣
Machine Design
Comments
Question
The ball bearings are provided with a cage
Options
A. to reduce friction
B. to facilitate slipping of balls
C. to prevent the lubricant from flowing out
D. to maintain the balls at a fixed distance apart
Correct Answer
to maintain the balls at a fixed distance apart
Machine Design problems
Search Results
1. Which of the following statement is wrong?
Options
A. The power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
B. The V-belt drive is used with large centre distance
C. The V-belt may be operated in either direction with tight side of the belt at the top or bottom
D. The ratio of driving tensions in V-belt drive is more than flat belt drives
Show Answer
Scratch Pad
Discuss
Correct Answer: The V-belt drive is used with large centre distance
2. A crankshaft is a __________ shaft.
Options
A. transmission
B. machine
Show Answer
Scratch Pad
Discuss
Correct Answer: machine
3. The load cup of a screw jack is made separate from the head of the spindle to
Options
A. enhance the load carrying capacity of the jack
B. reduce the effort needed for lifting the working load
C. prevent the rotation of load being lifted
D. reduce the value of frictional torque
Show Answer
Scratch Pad
Discuss
Correct Answer: prevent the rotation of load being lifted
4. Surface endurance limit of gear material is dependent upon its
Options
A. elastic strength
B. yield strength
C. brinell hardness number
D. toughness
Show Answer
Scratch Pad
Discuss
Correct Answer: brinell hardness number
5. Circumferential joint in boilers is used to get the required length of a boiler.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: True
6. The centre distance between two meshing involute gears is equal to
Options
A.
B.
C.
D.
Show Answer
Scratch Pad
Discuss
Correct Answer:
7. The toughness of a material __________ when it is heated.
Options
A. increases
B. decreases
C. does not change
Show Answer
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Discuss
Correct Answer: decreases
8. In a flange coupling, the flanges are coupled together by means of
Options
A. bolts and nuts
B. studs
C. headless taper bolts
D. none of these
Show Answer
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Discuss
Correct Answer: bolts and nuts
9. Which of the following material has the maximum ductility?
Options
A. Mild steel
B. Copper
C. Zinc
D. Aluminium
Show Answer
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Discuss
Correct Answer: Mild steel
10. According to Unwin's formula, the relation between the diameter of rivet hole (
d
) and the thickness of plate (
t
) is given by (where
d
and
t
are in mm)
Options
A.
d
=
t
B.
d
= 1.6
t
C.
d
= 2
t
D.
d
= 6
t
Show Answer
Scratch Pad
Discuss
Correct Answer:
d
= 6
t
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