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Free download in PDF Theory of Machines Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
Elements of pairs held together mechanically is known as
[A]
closed pair
[B]
open pair
[C]
mechanical pair
[D]
rolling pair
42
The number of links in pantograph mechanism is equal to
43
A mechanism is an assemblage of
[A]
three links
[B]
four links or more than four links
[C]
two links
[D]
all of the above
Answer: four links or more than four links
44
Sense of tangential acceleration of a link
[A]
is same as that of velocity
[B]
is opposite to that of velocity
[C]
could be either same or opposite to velocity
[D]
none of the above
Answer: could be either same or opposite to velocity
45
Oldham’s coupling is the
[A]
second inversion of double slider crank chain
[B]
third inversion of double slider crank chain
[C]
second inversion of single slider crank chain
[D]
third inversion of slider crank chain
Answer: third inversion of double slider crank chain
46
A completely constrained motion can be transmitted with .
[A]
4 links with pin joints
[B]
3 links with pin joints
[C]
1 link with pin joints
[D]
2 links with pin joints
Answer: 4 links with pin joints
47
Ackermann steering gear consists of
[A]
turning pairs
[B]
higher pairs
[C]
sliding pairs
[D]
rolling pairs
48
Davis steering gear consists of
[A]
higher pairs
[B]
turning pairs
[C]
sliding pairs
[D]
rolling pairs
49
The Scott-Russell mechanism consists of
[A]
turning and rotary pairs
[B]
sliding and turning pairs
[C]
sliding and rotary pairs
[D]
sliding pairs only
Answer: sliding and turning pairs
50
Which of the following would constitute a link
[A]
piston, piston-rod and cross head
[B]
piston, crank pin and crank shaft
[C]
piston, and piston rod
[D]
piston rod and cross head
Answer: piston, piston-rod and cross head
51
Which of the following mechanism is obtained from lower pair
[A]
generated straight line motions
[B]
pantograph
[C]
gyroscope
[D]
all of the above
52
The example of higher pair is
[A]
ball and roller bearings
[B]
belt, rope and chain drives
[C]
gears, cams
[D]
all of the above
53
Which of the following has sliding motion
[A]
cross-head
[B]
crank pin
[C]
crank
[D]
connecting rod
54
In higher pair, the relative motion is
[A]
combination of sliding and turning
[B]
purely surface contact
[C]
Purely turning
[D]
purely sliding
Answer: combination of sliding and turning
55
Automobile steering gear is an example of
[A]
lower pair
[B]
rotary pair
[C]
higher pair
[D]
sliding pair
56
The lower pair is a
[A]
closed pair
[B]
sliding pair
[C]
open pair
[D]
point contact pair
57
Kinematic pairs are those which have two elements that
[A]
permit relative motion
[B]
are held together
[C]
have line contact
[D]
have surface contact
Answer: permit relative motion
58
If there are L number of links in a mechanism then number of possible inversions is equal to
[A]
L + 1
[B]
L – 1
[C]
L
[D]
L + 2
59
If some links are connected such that motion between them can take place in more than one direction, it is called
[A]
incompletely constrained motion
[B]
partially constrained motion
[C]
completely constrained motion
[D]
successfully constrained motion
Answer: incompletely constrained motion
60
A circular bar moving in a round hole is an example of
[A]
incompletely constrained motion
[B]
partially constrained motion
[C]
completely constrained motion
[D]
successfully constrained motion
Answer: incompletely constrained motion
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