Lakshya Education MCQs

Question: A shaft has an attached disc at the centre of its length. the disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. when the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. when the shaft is rotated at 300 r.p.m., it will whirl with a radius of
Options:
A. 2 mm
B. 2.22 mm
C. 2.50 mm
D. 3.0 mm
Answer: Option B

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Question 1. The lead screw of a lathe with nut forms a
  1.     Rolling pair
  2.     Sliding pair
  3.     Screw pair
  4.     Turning pair
Answer: Option C
Question 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
  1.     1/24
  2.     1/8
  3.     4/15
  4.     12
Answer: Option A
Question 3. A point b on a rigid link ab moves with respect to a with angular velocity ω rad/s. the total acceleration of b with respect to a will be equal to
  1.     Vector sum of radial component and Coriolis component
  2.     Vector sum of tangential component and Coriolis component
  3.     Vector sum of radial component and tangential component
  4.     Vector difference of radial component and tangential component
Answer: Option C
Question 4. The c.g. of a link in any mechanism would experience
  1.     No acceleration
  2.     Linear acceleration
  3.     Angular acceleration
  4.     Both angular and linear accelerations
Answer: Option D
Question 5. A body is said to be under forced vibrations, when
  1.     There is a reduction in amplitude after every cycle of vibration
  2.     No external force acts on a body, after giving it an initial displacement
  3.     A body vibrates under the influence of external force
  4.     None of the above
Answer: Option A
Question 6. Abcd is a four bar mechanism in which ab = 310 mm and cd = 450 mm. ab and cd are both perpendicular to the fixed link ad, as shown in the below figure. if the velocity of b at this condition is v. then the velocity of c is
  1.     (1/3). v
  2.     (2/3). v
  3.     (3/2). v
  4.     (9/4). v
Answer: Option C
Explanation :

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