277) Which of the following statement is correct?

The primary unbalanced force is less than the secondary unbalanced force.

The primary unbalanced force is maximum twice in one revolution of the crank.

The unbalanced force due to reciprocating masses varies in magnitude and direction both.

The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines

Answer is:

The primary unbalanced force is maximum twice in one revolution of the crank.

Theory of Machines MCQ with Answers

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279) A pendulum type governor is a Watt governor.

Answer is:

Agree

280) In a single slider crank chain

Answer is:

three are turning pairs and one is a sliding pair

Explanation:

Single slider crank chain is a modification of the four bar chain. Single slider crank chain consists of one sliding pair and three turning pairs. It is, usually, found in reciprocating steam engine mechanism. This type of mechanism converts rotary motion into reciprocating motion. The inversions of a single slider crank chain are found in the following mechanisms.
* Pendulum pump or Bull engine
* Oscillating cylinder engine
* Rotary internal combustion engine or Gnome engine.
* Crank and slotted lever quick return motion mechanism.
* Whitworth quick return motion mechanism.