Engineering :: Machine Design
531.
Low pressure angle on gears results in
A.
Weaker teeth
B.
stronger teeth
C.
abrasive wear
D.
none of the above
Answer: Option A
Explanation:
532.
In the case of ball bearings the contacting areas between balls and running tracks are
A.
circular
B.
parabolic
C.
elliptical
D.
none of the above
Answer: Option C
Explanation:
533.
In the case of roller bearings the contacting areas between rollers and running tracks are
A.
circular
B.
parabolic
C.
elliptical
D.
oblong
Answer: Option D
Explanation:
534.
The critical pressure of the journal bearing is
A.
at which oil film breaks down
B.
metal to metal contact begins
C.
minimum operating pressure of the bearing
D.
none of the above
Answer: Option A
Explanation:
535.
Fine thread with 16 mm nominal diameter and 1.5 mm pitch is designed as
A.
M 1.5 x 16
B.
M 16 x 1.5
C.
M 16
D.
none of the above
Answer: Option B
Explanation:
536.
The most common material used for rivets is
A.
cast iron
B.
malleable cast iron
C.
mild steel
D.
none of the above
Answer: Option C
Explanation:
537.
The main difference between rigid and flexible coupling for shafts transmitting power is
A.
the number of coupling bolts are more in flexible coupling than in rigid coupling
B.
a flexible element is inserted around coupling bolts in one of the flanges
C.
There is a protective flange over bolts in the case of flexible coupling
D.
none of the above
Answer: Option B
Explanation:
538.
A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are
A.
Both the ends fixed
B.
Both the ends are free
C.
Both the ends are hinged
D.
none of the above
Answer: Option C
Explanation:
539.
Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because
A.
helical gears have some helix angle but the spur gears are straight
B.
there is end thrust in helical gears
C.
in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate
D.
none of the above
Answer: Option C
Explanation:
540.
In an open belt-pulley drive the bodily slip occurs
A.
first at larger pulley
B.
first at smaller pulley
C.
simultaneously on both the pulleys
D.
none of the above
Answer: Option C
Explanation:
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