Theory of Machines Quiz | Theory of Machines Short Questions & Answers

Questions
41 Elements of pairs held together mechanically is known as
A closed pair
B open pair
C mechanical pair
D rolling pair

Answer: closed pair
42 The number of links in pantograph mechanism is equal to
A 4
B 6
C 2
D 5

Answer: 4
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

Answer: turning pairs
48 Davis steering gear consists of
A higher pairs
B turning pairs
C sliding pairs
D rolling pairs

Answer: sliding 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

Answer: 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

Answer: all of the above
53 Which of the following has sliding motion
A cross-head
B crank pin
C crank
D connecting rod

Answer: cross-head
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

Answer: lower pair
56 The lower pair is a
A closed pair
B sliding pair
C open pair
D point contact pair

Answer: closed 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

Answer: L
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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