# Practice Test: Question Set - 23

**1. In a simple train of wheels, the velocity ratio __________ the intermediate wheels.**

- (A) Depends upon

- (B) Is
independent of

- (C) Either A or
B

- (D) None of
these

**2. There are six gears**

*A*,*B*,*C*,*D*,*E*and*F*in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (*F*) to the driver (*A*) of the drive is- (A) 1/24

- (B) 1/8

- (C) 4/15

- (D) 12

**3. In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to**

- (A) Minimize the
effect of primary forces

- (B) Minimize the effect of secondary forces

- (C) Have perfect
balancing

- (D) To start the
locomotive quickly

**4. Power of a governor is the**

- (A) Mean
force exerted at the sleeve for a given percentage change of speed

- (B) Work-done at
the sleeve for maximum equilibrium speed

- (C) Mean force
exerted at the sleeve for maximum equilibrium speed

- (D) None of the
above

**5. The C.G. of a link in any mechanism would experience**

- (A) No
acceleration

- (B) Linear
acceleration

- (C) Angular
acceleration

- (D) Both
angular and linear accelerations

**6. Instantaneous center of rotation of a link in a four bar mechanism lies on**

- (A) Right
side pivot of this link

- (B) Left
side pivot of this link

- (C) A
point obtained by intersection on extending adjoining links

- (D) Can’t occur

**7. In a simple harmonic motion, the velocity vector with respect to displacement vector**

- (A) Is in phase

- (B) Leads by 90°

- (C) Leads by 180°

- (D) Lags by 90°

**8. In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines**

- (A) The
algebraic sum of the primary forces must be equal to zero

- (B) The
algebraic sum of the couples about any point in the plane of the primary forces
must be equal to zero

- (C) Both (A) and
(B)

- (D) None of
these

**9. If Ï‰/Ï‰**

_{n}*is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach*- (A) 0°

- (B) 90°

- (C) 180°

- (D) 360°

**10. The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as**

- (A) Static
friction

- (B) Dynamic
friction

- (C) Limiting
friction

- (D) Coefficient
of friction

**11. The component of the acceleration, parallel to the velocity of the particle, at the given instant is called**

- (A) Radial
component

- (B) Tangential
component

- (C) Coriolis
component

- (D) None of
these

**12. Frequency of vibrations is usually expressed in**

- (A) Number of
cycles per hour

- (B) Number
of cycles per minute

- (C) Number
of cycles per second

- (D) None of
these

**13. The train value of a gear train is**

- (A) Equal to
velocity ratio of a gear train

- (B) Reciprocal
of velocity ratio of a gear train

- (C) Always
greater than unity

- (D) Always less
than unity

**14. When the primary direct crank of a reciprocating engine makes an angle of**

*'Î¸'*with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.- (A)

*Î¸/2*

- (B)

*Î¸*

- (C)

*2Î¸*

- (D)

*4Î¸*

**15. The mechanism consisting of three turning pairs and one sliding pair, is called a**

- (A) Single
slider crank chain

- (B) Whitworth
quick return motion mechanism

- (C) Crank
and slotted lever quick return motion mechanism

- (D) All of the
above

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