Machine Design Questions and Answers – Coefficient of Flywheel

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Coefficients of Flywheel & Solid Disk Flywheel”.

1. Calculate the coefficient of fluctuation of speed if maximum speed is 2500rpm and minimum speed is 1800rpm.
a) 1.44
b) 1.33
c) 0.33
d) 0.44
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2. Calculate the coefficient of steadiness if maximum speed of flywheel is 2500rpm and minimum speed is 1800rpm.
a) 3.03
b) 0.33
c) 0.44
d) 3.99
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3. Calculate the mean torque T supplied by motor (Torque vs. theta graph of a flywheel is shown below).

a) 3000N-m
b) 1500N-m
c) 2000N-m
d) 2500N-m
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4. The point where angular velocity is maximum is?

a) A
b) B
c) C
d) D
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5. The point where velocity of flywheel is maximum is

a) A
b) B
c) C
d) D
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6. Calculate the energy output from flywheel.

a) 500π
b) 150π
c) 200π
d) 250π
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7. Torque vs. theta graph of a flywheel is shown. Coefficient of fluctuation of speed is 0.2 and the mean angular velocity of the machine is 25 rad/s. Thickness of flywheel is 20mm and density of steel used is 7700kg/mᵌ. Calculate the outer radius of the flywheel.

a) 402mm
b) 202mm
c) 540mm
d) 468mm
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8. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the energy at point B if energy assumed at point A is U.

a) U
b) U-300
c) U+300
d) U-150
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9. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the energy at point C if energy at point A is U.

a) U-550
b) None of the listed
c) U+550
d) U+550
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10. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the energy at point F if energy at A is u.

a) U+340
b) U+260
c) U+400
d) Can’t be determined
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11. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the maximum energy.

a) U+1000
b) U+950
c) U+630
d) U+600
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12. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the point of minimum energy.

a) U+480
b) U+650
c) U-300
d) U-450
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13. The turning moment diagram of a multi cylinder engine is shown below. The intercepted areas between torque developed by the engine and the mean resisting torque of the machine taken in order from one end are -300,+850 -500, + 900, -550, + 430 and -700 mm². Calculate the net energy output from the flywheel.

a) 1300mm²
b) 1400mm²
c) 1250mm²
d) 1500mm²
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14. Feather key can be used to prevent axial motion between two elements.
a) True
b) False
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15. Keyed joints never lead to stress concentration on shafts.
a) True
b) False
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Sanfoundry Global Education & Learning Series – Machine Design.
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