# Practice Test: Question Set - 02

**1. The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where**

*m*= Mass of reciprocating parts,*ω*= Angular speed of crank,*r*= Radius of crank,*θ*= Angle of inclination of crank with the line of stroke, and*n*= Ratio of the length of connecting rod to radius of crank)- (A)

*m*.ω².

*r sinθ*

- (B)

*m*.ω².

*r cosθ*

- (C)

*m*.ω².

*r (*sin 2

*θ/n)*

- (D)

*m*.ω².

*r (*cos 2

*θ/n)*

**2. The steering of a ship means**

- (A) Movement
of a complete ship up and down in vertical plane about transverse axis

- (B) Turning
of a complete ship in a curve towards right or left, while it moves forward

- (C) Rolling
of a complete ship sideways

- (D) None of the
above

**3. The height of a Watt's governor is**

- (A) Directly
proportional to speed

- (B) Directly
proportional to (speed)²

- (C) Inversely
proportional to speed

- (D) Inversely
proportional to (speed)²

**4. In a differential band brake as shown in the below figure, if the length**

*OB*is greater than*OA*, then the force*P*at*C*should act in the downward direction.- (A) Yes

- (B) No

- (C) Unpredictable

- (D) None of
these

**5. A slider crank chain consists of following numbers of turning and sliding pairs**

- (A) 1, 3

- (B) 2, 2

- (C) 3, 1

- (D) 4, 0

**6. Kinematic pairs are those which have**

- (A) Point
or line contact between the two elements when in motion

- (B) Surface
contact between the two elements when in motion

- (C) Elements
of pairs not held together mechanically

- (D) Two
elements that permit relative motion

**7. The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where**

*r₁*= Minimum radius of the cam,*r₂*= Radius of the roller follower, and*θ*= Angle turned by the cam from the beginning of the follower displacement)- (A)

*(r₁ - r₂) (*1

*- cosθ)*

- (B)

*(r₁*+

*r₂) (*1 +

*cosθ)*

- (C)

*(r₁ - r₂) [(*1

*- co*s

*θ)/cosθ]*

- (D)

*(r₁*+

*r₂) [(*1

*- cosθ)/cos*

*θ]*

**8. Longitudinal vibrations are said to occur when the particles of a body moves**

- (A) Perpendicular
to its axis

- (B) Parallel to
its axis

- (C) In a circle
about its axis

- (D) None of
these

**9. When brakes are applied to all the four wheels of a moving car, the distance traveled by the car before it is brought to rest, will be**

- (A) Maximum

- (B) Minimum

- (C) Zero

- (D) None of
these

**10. In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is**

- (A) Equal
to sum of other two

- (B) Greater than sum of other two

- (C) Less than sum of other two

- (D) There
is no such relationship

**11. The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is**

- (A)

*(1/2) μ W R cosecα*

- (B)

*(2/3) μ W R cosecα*

- (C)

*(3/4) μ W R cosecα*

- (D)

*μ W R cosecα*

**12. In vibration isolation system, if ω/ω**

_{n}*> 1, then the phase difference between the transmitted force and the disturbing force is*- (A) 0°

- (B) 90°

- (C) 180°

- (D) 270°

**13. The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where**

*m*= Mass of the ball, and*M*= Mass on the sleeve)- (A)

*m/(m*+

*M)*

- (B)

*M/(m*+

*M)*

- (C)

*(m*+

*M)/m*

- (D)

*(m*+

*M)/M*

**14. In a shaper mechanism, the Coriolis component of acceleration will**

- (A) Not exist

- (B) Exist

- (C) Depend
on position of crank

- (D) None
of the above

**15. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will**

- (A) Cause
withdrawing or throttling of steam

- (B) Reduce
length of effective stroke of piston

- (C) Reduce
maximum opening of port to steam

- (D) All
of these

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