# Practice Test: Question Set - 19

1. A mechanism is an assemblage of
(C) Four or more than four links
(D) All of these

2. The ratio of the driving tensions for V-belts is __________ times that of flat belts.
(Where Î² = Semi-angle of the groove)
(A) sinÎ²
(B) cosÎ²
(C) cosecÎ²
(D) secÎ²

3. A reed type tachometer use the principle of
(A) Longitudinal vibration
(B) Torsional vibration
(C) Transverse vibration
(D) Damped free vibration

4. A point B on a rigid link AB moves with respect to A with angular velocity Ï‰ rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)
(A) vBA × AB
(B) vBA /AB
(C) BA
(D) BA /AB

5. The example of completely constrained motion is a
(A) Motion of a piston in the cylinder of a steam engine
(B) Motion of a square bar in a square hole
(C) Motion of a shaft with collars at each end in a circular hole
(D) All of the above

6. The locus of a point on a thread unwound from a cylinder will be
(A) A straight line
(B) A circle
(C) Involute
(D) Cycloidal

7. In its simplest form, a cam mechanism consists of following number of links
(A) 1
(B) 2
(C) 3
(D) 4

8. The number of links and instantaneous centers in a reciprocating engine mechanism are
(A) 4, 4
(B) 4, 5
(C) 5, 4
(D) 4, 6

9. The Coriolis component of acceleration is taken into account for
(A) Slider crank mechanism
(B) Four bar chain mechanism
(C) Quick return motion mechanism
(D) All of these

10. Which of the following is a pendulum type governor?
(A) Watt governor
(B) Porter governor
(C) Hartnell governor
(D) None of these

11. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
(A) (1/2). Î¼ W cosecÎ± (r₁ + r₂)
(B) (2/3). Î¼ W cosecÎ± (r₁ + r₂)
(C) (1/2). Î¼ W cosecÎ± [(r₁³ - r₂³)/(r₁² - r₂²)]
(D) (2/3). Î¼ W cosecÎ± [(r₁³ - r₂³)/(r₁² - r₂²)]

12. The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)
(A) c (m - M) g
(B) c (m + M) g
(C) c/(m + M) g
(D) c/(m - M) g

13. When a point moves along a straight line, its acceleration will have
(B) Tangential component only
(C) Coriolis component only
(D) Radial and tangential components both

14. If two moving elements have surface contact in motion, such pair is known as
(A) Sliding pair
(B) Rolling pair
(C) Surface pair
(D) Higher pair

15. If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to
(A) D₁/D₂
(B) D₂/D₁
(C) D₁.D₂
(D) D₁

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Theory of Machines:
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