Explore topic-wise MCQs in Machine Design.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.

1.

A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2.

A. None of the listed
B. 21123N
C. 17200N
D. 16789N
Answer» D. 16789N
Discussion
2.

A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the torque capacity f each shoe. Assume coefficient of friction as 0.2.

A. 789N-m
B. 1081N-m
C. 945N-m
D. None of the listed
Answer» C. 945N-m
Discussion
3.

A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Calculate the distance of pivot from axis of drum.

A. 321.5mm
B. 314.3mm
C. 289.5mm
D. None of the mentioned
Answer» C. 289.5mm
Discussion
4.

Shoe is constrained to move towards the drum to compensate for the moment acting.

A. Yes
B. It compensates for wear
C. It compensates for both wear and moment
D. None of the listed
Answer» C. It compensates for both wear and moment
Discussion
5.

The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ].

A. True
B. False
Answer» C.
Discussion
6.

A_PIVOTED_DOUBLE_BLOCK_BRAKE_HAS_A_DRUM_RADIUS_OF_280MM_WITH_TWO_SHOES_SUBTENDING_AN_ANGLE_OF_100‚ÄÖ√Ñ√∂‚ÀÖ√Ñ‚ÄÖ√†√ª._CALCULATE_THE_DISTANCE_OF_PIVOT_FROM_AXIS_OF_DRUM.?$#

A. 321.5mm
B. 314.3mm
C. 289.5mm
D. None of the mentioned
Answer» C. 289.5mm
Discussion
7.

A_pivoted_double_block_brake_has_a_drum_radius_of_280mm_with_two_shoes_subtending_an_angle_of_100⁰._Maximum_pressure_intensity_is_0.5N/mm²._If_the_width_of_friction_lining_is_90mm,_find_the_torque_capacity_f_each_shoe._Assume_coefficient_of_friction_as_0.2.$#

A. 789N-m
B. 1081N-m
C. 945N-m
D. None of the listed
Answer» C. 945N-m
Discussion
8.

A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2.$

A. None of the listed
B. 2113N
C. 1720N
D. 3440N
Answer» E.
Discussion
9.

Shoe is constrained to move towards the drum to compensate for the moment acting?

A. Yes
B. It compensates for wear
C. It compensates for both wear and moment
D. None of the listed
Answer» C. It compensates for both wear and moment
Discussion
10.

In pivoted block brakes, moment of frictional force about pivot is non zero.

A. True
B. False
Answer» C.
Discussion
11.

The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ].$

A. True
B. False
Answer» C.
Discussion
12.

The pressure intensity at an element on long shoe brake varies directly with the sin of the pressure angle of the element of friction lining.

A. True
B. False
Answer» C.
Discussion
13.

In a block brake with short shoe, it is assumed that friction force and normal reaction are concentrated at the midpoint of the shoe.

A. True
B. False
Answer» B. False
Discussion
14.

If initially drum of radius 200mm is rotating at 100rpm, then calculate the heat generated if frictional force acting is 1140N.

A. 3345W
B. 4456W
C. 5969W
D. 11938W
Answer» D. 11938W
Discussion
15.

If torque capacity of a block brake is 240N-m and radius of drum is 210mm with coefficient of friction 0.4.

A. None of the listed
B. 2857.14N
C. 3443.42N
D. 2334.62N
Answer» C. 3443.42N
Discussion
16.

Block brakes are never used in railway trains.

A. True
B. False
Answer» C.
Discussion