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BRAKES Multiple choice Questions :-
1. Brake is used to ____ the energy possessed by a moving system or mechanism by means of friction.
(A) Absorb
(B) Release
(C) Minimize
(D) Maximize
2. The energy absorbed by the brake is
(A) Kinetic energy
(B) Potential energy
(C) both (A) and (B)
(D) None of the above
3. In hoists and elevators, the brake absorbs the
(A) Kinetic energy
(B) Potential energy
(C) both (A) and (B)
(D) None of the above
4. The energy absorbed by the brake is converted into
(A) Heat energy
(B) Electrical energy
(C) Mechanical energy
(D) Kinetic energy
5. Mechanical brakes are operated by
(A) Levers
(B) Springs
(C) Pedals
(D) Any of the above
6. Internal and External expanding shoe brakes are
(A) Radial brakes
(B) Axial brakes
(C) Both (A) and (B)
(D) None of the above
7. Which of the following is (are) an electrical brake?
(A) Magnetic particle brake
(B) Hysteresis brake
(C) Eddy current brake
(D) All of the above
8. Brake capacity depends upon
(A) The unit pressure between braking surfaces
(B) The contacting area of braking surface
(C) The coefficient of friction
(D) All of the above
9. The braking torque depends upon
(A) The mass of the system
(B) Initial velocity of the system
(C) Final velocity of the system
(D) All of the above
10. Which type of brake is commonly employed in railway trains?
(A) Block brake
(B) Internal expanding brake
(C) Band brake
(D) Any of the above
11. When the intensity of pressure between the block and brake drum is uniform, the angle of contact between the block and brake drum is less than
(A) 30°
(B) 45°
(C) 60°
(D) 90°
12. For anticlockwise rotation of brake drum in block brake, the actuating force or braking effort is ___ that of clockwise direction.
(A) More than
(B) Less than
(C) Equal to
(D) Any of the above
13. In block brake with long shoe, the semi-block angle is
(A) 2θ
(B) θ
(C) θ/2
(D) None of the above
14. The brake drum is made of
(A) Cast iron
(B) Steel
(C) Aluminium
(D) All of the above
15. In block brakes with long shoe, equivalent coefficient of friction is given by
(A) µ[(4sinθ)/(2θ+sin2θ)]
(B) µ[(2sinθ)/(2θ+sin2θ)]
(C) µ[(4sinθ)/(θ+sin2θ)]
(D) µ[(4sinθ)/(2θ+sinθ)]
Where, 2θ= block angle, µ=Coefficient of friction
16. In case of the pivoted shoe brake, the location of the pivot can be selected in such a way that the moment of frictional force about the pivot is
(A) Zero
(B) One
(C) Maximum
(D) Minimum
17. In brakes, the wear occurs on the
(A) Friction lining
(B) Brake drum
(C) Both (A) and (B)
(D) None of the above
18. Pivoted shoe brakes are mainly used in
(A) Automobiles
(B) Railway trains
(C) Hoists and Cranes
(D) All of the above
19. In internal expanding shoe brake, the actuating force is usually provided by means of
(A) A hydraulic cylinder
(B) A cam mechanism
(C) Both (A) and (B)
(D) None of the above
20. An internal expanding shoe brake is mainly used in
(A) Vehicle
(B) Conveyor
(C) Hoist
(D) All of the above
21. In band brake, the ratio of band tensions (P1/P2) is given by
(A) eµθ
(B) eµθ
(C) µθ
(D) None of the above
22. Band brakes are used in
(A) Bucket conveyors
(B) Hoists
(C) Chain saws
(D) All of the above
23. Following brake can never become self-locking
(A) Band brake
(B) Block brake
(C) Disk brake
(D) All of the above
24. Following is (are) the type(s) of shape(s) for the pads of caliper disk brakes
(A) Annular
(B) Circular
(C) Both (A) and (B)
(D) None of the above
25. The torque capacity (Mt) of disk brake is given by
(A) µPRf
(B) µ/PRf
(C) µP/Rf
(D) µRf /P
Where, µ=coefficient of friction, P=Actuating force, Rf=friction radius
26. When the temperature increases, the coefficient of friction
(A) Decreases
(B) Increases
(C) remains same
(D) Any of the above