Practice Test: Question Set - 19
1. A mechanism is an assemblage of
- (A) Two links
- (B) Three links
- (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 β = Semi-angle of the groove)
- (A) sinβ
- (B) cosβ
- (C) cosecβ
- (D) secβ
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 ω 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) v²BA
- (D) v²BA /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). μ W cosecα (r₁ + r₂)
- (B) (2/3). μ W cosecα (r₁ + r₂)
- (C) (1/2). μ W cosecα [(r₁³ - r₂³)/(r₁² - r₂²)]
- (D) (2/3). μ W cosecα [(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
- (A) Radial component only
- (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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