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

View Answer

Answer: closed pair

42 The number of links in pantograph mechanism is equal to

A 4

B 6

C 2

D 5

View Answer

Answer: 4

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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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: 4 links with pin joints

47 Ackermann steering gear consists of

A turning pairs

B higher pairs

C sliding pairs

D rolling pairs

View Answer

Answer: turning pairs

48 Davis steering gear consists of

A higher pairs

B turning pairs

C sliding pairs

D rolling pairs

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: all of the above

53 Which of the following has sliding motion

A cross-head

B crank pin

C crank

D connecting rod

View Answer

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

View Answer

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

View Answer

Answer: lower pair

56 The lower pair is a

A closed pair

B sliding pair

C open pair

D point contact pair

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: incompletely constrained motion

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