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Theory of Machines by Sadhu Singh

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290. Match List I with List II and select the correct answer using the codes given below the Lists:

    List I (Property)

    List II (System)

A. Resonsnce

1. Closed-loop control system

B. On-off control

2. Free vibrations

C. Natural frequency

3. Excessively large amplitude

D. Feedback signal

4. Mechanical brake

Codes:

            A    B    C    D

  1.    1     2     4     3
  2.    3     4     2     1
  3.    1     4     2     3
  4.    3     2     4     1

291. In case of partial balancing of single-cylinder reciprocating engine, what is the primary disturbing force along the line of stroke?

  1. cmr ω2 cos θ
  2. (1 − c2) mr ω2 cos θ
  3. (1 − c) 2r cos 2θ
  4. (1 − c) 2r cos 2θ

where, c = Fraction of reciprocating mass to be balanced; ω = Angular velocity ...

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