Practice Test: Question Set - 22
1. The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.
- (A) Same
- (B) Different
- (C) Unpredictable
- (D) None of
these
2. Governor is used in automobile to
- (A) Decrease the variation of
speed
- (B) Maximize the fuel economy
- (C) Limit the vehicle speed
- (D) Maintain
constant engine speed
3. The following is the inversion of slider crank chain mechanism
- (A) Whitworth quick
return mechanism
- (B) Hand pump
- (C) Oscillating cylinder
engine
- (D) All of the above
4. The power from the engine to the rear axle of an automobile is transmitted by means of
- (A) Worm
and worm wheel
- (B) Spur gears
- (C) Bevel gears
- (D) Hooke's
joint
5. In an open pair, the two elements of a pair
- (A) Have a surface contact when in motion
- (B) Have a line or point contact when in motion
- (C) Are kept in contact by the action of external
forces, when in motion
- (D) Are not held together mechanically
6. In a multiple V-belt drive, if one of the belts is broken, then we should replace
- (A) The broken
belt only
- (B) All the
belts
- (C) The broken
belt and the belts on either side of it
- (D) None of the
above
7. Flexible coupling is used because
- (A) It is easy to disassemble
- (B) It is easy to engage and
disengage
- (C) It transmits shocks
gradually
- (D) It prevents shock
transmission and eliminates stress reversals
8. A cam with a roller follower would constitute following type of pair
- (A) Lower pair
- (B) Higher pair
- (C) Open pair
- (D) Close pair
9. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
- (A) To raise the
bow and stern
- (B) To lower the
bow and stern
- (C) To
raise the bow and lower the stern
- (D) To
raise the stern and lower the bow
10. When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
- (A) ω² r {(n + 1)/n}
- (B) ω² r {(n - 1)/n}
- (C) ω² r {n/(n + 1)}
- (D) ω² r {n/(n - 1)}
11. The secondary 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 2θ/n)
- (D) m.ω².r
(cos 2θ/n)
12. If ω/ωn is very low 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°
13. The Klein's diagram is useful to find
- (A) Displacement
of various parts
- (B) Velocity
of various parts
- (C) Acceleration
of various parts
- (D) Angular
acceleration of various parts
14. Angular acceleration of a link can be determined by dividing the
- (A) Centripetal component
of acceleration with length of link
- (B) Tangential component of
acceleration with length of link
- (C) Resultant
acceleration with length of link
- (D) All of the above
15. Which of the following mechanism is obtained from lower pair?
- (A) Gyroscope
- (B) Pantograph
- (C) Valve and valve gears
- (D) All of the above
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