# 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*v*= Linear velocity of_{BA}*B*with respect to*A*)- (A)

*v*×

_{BA}*AB*

- (B)

*v*

_{BA}*/AB*

- (C)

*v²*

_{BA}- (D)

*v²*

_{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). 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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