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

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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
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)]
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)]
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
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)]