Brakes Machine Design Questions and Answers - ObjectiveBooks

Mechanical Brakes Practice Test:

1. The heat generated in brake depends upon

Where, p = intensity of normal pressure (N/mm2), v = rubbing speed (m/mim)

(A) pv
(B) p/v
(C) pv2
(D) ½ pv2

2. In order to prevent the brake arm from grabbing, the moment of friction force about the brake arm pivot should be
(A) Less than the total required braking effort
(B) More than the total required braking effort
(C) Equal to the total required braking effort
(D) None of the above

3. The friction material of the brake should have
(A) High coefficient of friction
(B) Low coefficient of friction
(C) High surface hardness
(D) High endurance limit strength

4. The brake used in railway coaches is
(A) Shoe brake
(B) Block brake
(C) Band brake
(D) Disk brake

5. When the frictional force helps to apply the brake, the brake is said to be

(A) Partially self energizing
(B) Self locking
(C) Back-stop
(D) Self acting

6. For a block brake with long shoe, the equivalent coefficient of friction is

Where, Âµ = coefficient of friction, Î¸ = semi-block angle

(A) Î¼ [4 SinÎ¸/(2Î¸ + sin 2Î¸)]
(B) Î¼ [2 SinÎ¸/(2Î¸ + sin 2Î¸)]
(C) Î¼ [4 Sin 2Î¸/(2Î¸ + sin 2Î¸)]
(D) Î¼ [4 SinÎ¸/(4Î¸ + sin 2Î¸)]

7. The brake used in most of motorcycles is
(A) Internal expanding brake
(B) Block brake
(C) Band brake
(D) Disk brake

8. The brake used in most of the automobile vehicles is
(A) Internal expanding shoe brake
(B) Block brake
(C) Band brake
(D) Disk brake

9. In block brakes, the ratio of shoe width and drum diameter is kept between
(A) 0.1 to 0.25
(B) 0.25 to 0.50
(C) 0.50 to 0.75
(D) 0.75 to 1.0

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