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MCQs

Total Questions : 543 | Page 30 of 55 pages
Question 291. The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)
  1.    sinβ
  2.    cosβ
  3.    cosecβ
  4.    secβ
 Discuss Question
Answer: Option C. -> cosecβ
Question 292. In an open pair, the two elements of a pair
  1.    Have a surface contact when in motion
  2.    Have a line or point contact when in motion
  3.    Are kept in contact by the action of external forces, when in motion
  4.    Are not held together mechanically
 Discuss Question
Answer: Option D. -> Are not held together mechanically
Question 293. In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to
  1.    Minimize the effect of primary forces
  2.    Minimize the effect of secondary forces
  3.    Have perfect balancing
  4.    To start the locomotive quickly
 Discuss Question
Answer: Option B. -> Minimize the effect of secondary forces
Question 294. If $$\frac{\omega }{{\omega {\text{n}}}} = 2,$$  where co is the frequency of excitation and $${\omega {\text{n}}}$$ is the natural frequency of vibrations, then the transmissibility of vibration will the
  1.    0.5
  2.    1
  3.    1.5
  4.    2
 Discuss Question
Answer: Option B. -> 1
Question 295. Which of the following is an inversion of a single slider crank chain?
  1.    Pendulum pump
  2.    Oscillating cylinder engine
  3.    Rotary internal combustion engine
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 296. ________ is an inversion of Double slider crank chain.
  1.    Coupling rod of a locomotive
  2.    Scotch yoke mechanism
  3.    Hand pump
  4.    Reciprocating engine
 Discuss Question
Answer: Option B. -> Scotch yoke mechanism
Question 297. A system of masses rotating in different parallel planes is in dynamic balance if the
  1.    Resultant force is equal to zero
  2.    Resultant couple is equal to zero
  3.    Resultant force and resultant couple are both equal to zero
  4.    Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
 Discuss Question
Answer: Option C. -> Resultant force and resultant couple are both equal to zero
Question 298. Which of the following is an inversion of a double slider crank chain?
  1.    Oldham's coupling
  2.    Elliptical trammel
  3.    Scotch yoke mechanism
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 299. Which of the following is an inversion of Single slider crank chain?
  1.    Beam engine
  2.    Rotary engine
  3.    Oldham’s coupling
  4.    Elliptical trammel
 Discuss Question
Answer: Option B. -> Rotary engine
Question 300. The Coriolis component of acceleration leads the sliding velocity by
  1.    45°
  2.    90°
  3.    135°
  4.    180°
 Discuss Question
Answer: Option B. -> 90°

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