Lakshya Education MCQs

Question: Which one of the following can completely balance several masses revolving in different planes on a shaft?
Options:
A. A single mass in different planes
B. Two masses in any two planes
C. A single mass in one of the planes of the revolving masses
D. Two equal masses in any two planes
Answer: Option B

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Question 1. Which one of the following can completely balance several masses revolving in different planes on a shaft?
  1.     A single mass in different planes
  2.     Two masses in any two planes
  3.     A single mass in one of the planes of the revolving masses
  4.     Two equal masses in any two planes
Answer: Option B
Question 2. The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = external and internal radii of collar respectively)
  1.     (1/2) μ W (r₁ + r₂)
  2.     (2/3) μ W (r₁ + r₂)
  3.     (1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
  4.     (2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
Answer: Option A
Question 3. The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = external and internal radii of collar respectively)
  1.     (1/2). μ W (r₁ + r₂)
  2.     (2/3). μ W (r₁ + r₂)
  3.     (1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
  4.     (2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
Answer: Option D
Question 4. The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in
  1.     A single plane
  2.     Two planes
  3.     Three planes
  4.     Four planes
Answer: Option B
Question 5. The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r₁ and r₂ = external and internal radii of collar respectively)
  1.     (1/2) μ W (r₁ + r₂)
  2.     (2/3) μ W (r₁ + r₂)
  3.     (1/2) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
  4.     (2/3) μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
Answer: Option A
Question 6. The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in
  1.     A single plane
  2.     Two planes
  3.     Three planes
  4.     Four planes
Answer: Option B

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