Belt Drives Mechanical Design Questions and Answers - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. The suitable material for belt used in flour mill is
(A) Leather
(B) Rubber
(C) Canvas or cotton duck
(D) Balata gum

2. The creep in the belt is due to
(A) Effect of temperature on belt
(B) Material of belt
(C) Unequal extensions in the belt due to tight and slack side tensions
(D) Stresses beyond elastic limit of belt material

3. The coefficient of friction in belt drive depends upon
(A) Material of belt
(B) Material of pulley
(C) Materials of belt and pulley
(D) Belt velocity

4. When the belt is transmitting maximum power,
(A) The tension in tight side is twice the centrifugal tension
(B) The tension in slack side is equal to the centrifugal tension
(C) The tension in tight side is thrice the centrifugal tension
(D) None of the above

5. When the belt is transmitting maximum power, the belt speed should be

Where, m = mass of belt per meter (kg/m), Pmax = maximum permissible tension in belt (N)

(A) √(Pmax /2 m)
(B) √(Pmax /3 m)
(C) √(Pmax /m)
(D) √(3 m/Pmax)

6. In a horizontal flat belt drive, it is customary to use
(A) Bottom side of belt as slack side
(B) Top side of belt as slack side
(C) Idler pulley
(D) None of the above

7. The included angle between the sides of V-belt is
(A) 40°
(B) 45°
(C) 38°
(D) 42°

8. The groove angle of pulleys for V-belt is
(A) 34° to 36°
(B) 42° to 45°
(C) More than 40°
(D) 30° to 32°

9. The objective of ‘crowning’ of the flat pulleys of belt drive is to
(A) Prevent the belt from running off the pulley
(B) Increase the power transmission capacity
(C) Increase the belt velocity
(D) Prevent the belt joint from damaging the belt surface

10. The objective of idler pulley in belt drive is to
(A) Decrease the tendency of belt to slip
(B) Increase the power transmission capacity
(C) Increase the wrap angle and belt tension
(D) All the above objectives

11. In case of V-belt drive, the belt makes contact at
(A) The bottom of groove in the pulley
(B) The bottom and the sides of groove in the pulley
(C) The sides of groove in the pulley
(D) None of the above

12. For same pulley diameters, centre distance, belt speed and belt and pulley materials,
(A) Open belt drive transmits more power than crossed belt drive
(B) Crossed belt drive transmits more power than open belt drive
(C) Open and crossed belt drives transmit same power
(D) Power transmission does not depend upon open and crossed types of constructions

13. The power transmitted by the belt drive can be increased by
(A) Increasing the initial tension in the belt
(B) Dressing the belt to increase the coefficient of friction
(C) Increasing wrap angle by using idler pulley
(D) All of the above methods

14. In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because
(A) Belts are available in sets
(B) Only one belt cannot be fitted with other used belts
(C) The new belt will carry more than its share and result in short life
(D) New and old belts will cause vibrations

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