Practice Test: Question Set - 20
1. In S.H.M., the velocity vector w.r.t. displacement vector
- (A) Leads by 90°
- (B) Lags by 90°
- (C) Leads by 180°
- (D) Are in phase
2. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
- (A) Lead
- (B) Steam lap
- (C) Exhaust lap
- (D) None of
these
3. The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
- (A) 2π. √(q/I)
- (B) 2π qI
- (C) (1/2π). √(q/I)
- (D) 1/2π
4. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is
- (A) 5,367 r.p.m.
- (B) 6,000 r.p.m.
- (C) 9,360 r.p.m.
- (D) 12,000
r.p.m.
5. The angle of inclination of the plane, at which the body begins to move down the plane is called
- (A) Angle
of friction
- (B) Angle of
repose
- (C) Angle
of projection
- (D) None
of these
6. Angle of descent of cam is defined as the angle
- (A) During
which the follower returns to its initial position
- (B) Of
rotation of the cam for a definite displacement of the follower
- (C) Through which the cam rotates
during the period in which the follower remains in the highest position
- (D) Moved by the cam from the
instant the follower begins to rise, till it reaches its highest position
7. The velocity of the rubbing surface __________ with the distance from the axis of the bearing.
- (A) Increases
- (B) Decreases
- (C) Remain same
- (D) None of
these
8. A shaft carrying two rotors at its ends will have
- (A) No node
- (B) One node
- (C) Two nodes
- (D) Three nodes
9. When the two elements of a pair have __________ when in motion, it is said to a lower pair.
- (A) Line or
point contact
- (B) Surface
contact
- (C) Body contact
- (D) None of
these
10. The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)
- (A) 0.4985/ √δS
- (B) 0.5615/ √δS
- (C) 0.571/ √δS
- (D) 0.6253/ √δS
11. The load cup of a screw jack is made separate from the head of the spindle to
- (A) Enhance the load carrying capacity of the
jack
- (B) Reduce the effort needed for lifting the working
load
- (C) Reduce the value of frictional torque
required to be countered for lifting the load
- (D) Prevent the rotation of load being lifted
12. Any point on a link connecting double slider crank chain will trace a
- (A) Straight line
- (B) Circle
- (C) Ellipse
- (D) Parabola
13. In elliptical trammels
- (A) All four pairs are turning
- (B) Three pairs turning and one
pair sliding
- (C) Two pairs turning and two
pairs sliding
- (D) One pair turning and three
pairs sliding
14. A chain comprises of 5 links having 5 joints. Is it kinematic chain?
- (A) Yes
- (B) No
- (C) It is a marginal case
- (D) Data
are insufficient to determine it
15. In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
- (A) Total lift,
total angle of lift, minimum radius of cam and cam speed
- (B) Radius of
circular arc, cam speed, location of centre of circular arc and roller diameter
- (C) Mass
of cam follower linkage, spring stiffness and cam speed
- (D) Total lift,
centre of gravity of the cam and cam speed
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