Theory of Machine Objective Questions

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11. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be?

A. more sensitive

B. less sensitive

C. isochronous

D. unaffected of sensitivity

Click for Answer/Explanation

Correct Answer is B

  • A sequence of events is isochronous if the events occur regularly, or at equal time intervals
  • Isochronous Governor- which is able to maintain an exactly constant speed without hunting.

12. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotors separately, are 100 Hz and 200 Hz respectively. Then what is the lowest critical speed is?

A. 5560 rpm

B. 5500 RPM

C. 5367 rpm

D. 5300 rpm

Click for Answer/Explanation

Correct Answer is C

13. What is the product of the diametrical pitch and circular pitch?

A. 1/Π

B. Π

C. 2Π

D. Π/2

Click for Answer/Explanation

Correct Answer is B

14. The Coriolis component of acceleration is taken into account for –

A. quick return motion mechanism

B. slider-crank mechanism

C. four bar chain mechanism

D. None of these

Click for Answer/Explanation

Correct Answer is A

15. Which one of these is an example of successfully constrained motion?

A. piston reciprocating inside an engine cylinder

B. motion of an I.C. engine valve

C. motion of the shaft between a foot-step bearing

D. All of these

Click for Answer/Explanation

Correct Answer is D

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