Theory of Machines - Interview Questions | Exam2Win

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56. The advantage of the piston valve over D-slide valve is that in the former case

A. wear is less

B. power absorbed is less

C. both wear and power absorbed are low

D. the pressure developed being high provides tight sealing

E. there is overall economy of initial cost, maintenance and operation.

Explanation:

57. The number of links in pantograph mechanism is equal to

A. 2

B. 3

C. 4

D. 5

E. 6.

Explanation:

58. Flexible coupling is used because

A. it is easy to disassemble

B. it is easy to engage and disengage

C. it transmits shocks gradually

D. it prevents shock transmission and eliminates stress reversals

E. it increases shaft life.

Explanation:

59. Rectangular bar in a rectangular hole is the following type of pair

A. completely constrained motion

B. partially constrained motion

C. incompletely constrained motion

D. freely constrained motion

E. none of the above.

Explanation:

60. Shaft revolving in a bearing is the following type of pair

A. lower pair

B. higher pair

C. spherical pair,

D. cylindrical pair

E. bearing pair.

Explanation: