Mechanical Engineering Past Papers MCQs
select the belt length when the diameter of the two pulleys are 550mm and 300mm if the centre distance is 2800mm.
(A). 6.5m
(B). 6.94m
(C). 4.66m
(D). 5.26m
(E). None of these
Answer
(E). None of these
Answer: (B). 6.94m
Select about the following statement, Crowns are never mounted on the pulley.
(A). False
(B). True
(E). None of these
Answer: (A). False
In a cast-iron pulley minor axis is mostly retained in the plane of rotation.
(A). False
(B). True
(E). None of these
Answer: (A). False
Band brake has a compound building with a large number of parts.
(A). Yes
(B). It has complicated construction but a small number of parts
(C). It has simple constructions but a large number of parts
(D). It has a simple construction
(E). None of these
Answer: (D). It has a simple construction
Select the toughness of a material, when it is heated.
A. decreases
B. increases
C. does not change
D. both a and b
(E). None of these
Answer: A. decreases
Disk brakes mostly face the problem of self-locking.
(A). Yes
(B). Self-locking but it depends on the radius of the wheel rotating
(C). No
(D). Material dependent
(E). None of these
Answer:(C). No
Disk brakes can be used for reverse rotation of the disk is also.
(A). Poor efficiency in the opposite direction
(B). They can be used
(C). No they are effective for one direction of motion only
(D). None of the listed
(E). None of these
Answer
(E). None of these
Answer: (C). No they are effective for one direction of motion only
Select the sliding bearing in which the working surfaces are totally break up from each other by lubricant is known as zero film bearing.
A. False
B. True
(E). None of these
Answer: A. False
Select the number of slots in a 25 mm castle nut.
A. 6
B. 4
C. 2
D. 8
(E). None of these
Answer: A. 6
at least one end of the band passes through the fulcrum, when we talk about both simple band brake and differential band brake,
(A). Both the ends
(B). One end
(C). Neither end
(D). All of the above
(E). None of these
Answer
(E). None of these
Answer: (C). Neither end
When the maximum tension in the belt is 900N and the allowable belt load is 500N. compute the number of belts needed to transmit power.
(A). 4
(B). 3
(C). 2
(D). 5
(E). None of these
Answer:(C). 2
The belt tension is maximum if the velocity of the belt is 0.
(A). It has a constant value
(B). True
(C). It is velocity independent
(D). It maxes at v=infinity
(E). None of these
Answer: (D). It maxes at v=infinity
Can we prevent back rotation of the drum?
(A). Depends on the angular velocity
(B). No
(C). Yes by using back stop brake
(D). Only in some specific cases
(E). None of these
Answer
(E). None of these
Answer: (C). Yes by using bac kstop brake
we can say that the self-locking differential brake and back stop brakes are the same thing.
(A). False
(B). True
(E). None of these
Answer:(B). True
The wear of band brake is even?
(A). False
(B). True
(E). None of these
Answer: (A). False
Select the braking torque if the tension in the two sides is 3500N and 1980N with a radius of drum being 160mm.
(A). None of the mentioned
(B). 278.6N-m
(C). 223.4N-m
(D). 243.20N-m
(E). None of these
Answer: (D). 243.20N-m
The Disk brakes have short torque transmitting capacity in high volumes.
(A). False
(B). True
(E). None of these
Answer
(E). None of these
Answer:(A). False
When the temperature grow coefficient of friction__________ In drum brakes,
(A). increases
(B). Can’t be determined
(C). remains the same
(D). decreases
(E). None of these
Answer: (B). Can’t be determined
The term of Loss of torque transmitting capacity at high temperatures is known as
(A). Drifting
(B). Rolling
(C). Fading
(D). Planking
(E). None of these
Answer: (C). Fading
The pitch diameter of bigger pulley D in terms of small diameter d is defined through
(A). dx[speed of bigger pulley/speed of smaller pulley]
(B). dx[speed of smaller pulley/speed of bigger pulley]
(C). d
(D). None of these
(E). None of these
Answer: (B). dx[speed of smaller pulley/speed of bigger pulley]
The Band brakes need which type of maintenance.
(A). Much
(B). Zero
(C). Little
(D). none of the above
(E). None of these
Answer: (C). Little
Screws used for power transmission should have
A. Low efficiency
B. high efficiency
C. very fine threads
D. strong teeth
(E). None of these
Answer: B
Select the number of rivets in shear shall same as to the number of rivets in crushing.
A. False
B. True
(E). None of these
Answer: B. True
The disk brake torque is linearly proportional to the operating force.
(A). Independent of force
(B). No, it is proportional to its square
(C). Proportional to its cube
(D). Yes
(E). None of these
Answer: (D). Yes
The sleeve or muff coupling is formed as
A. hollow shaft
B. thick cylinder
C. solid shaft
D. dun cylinder
(E). None of these
Answer: A. hollow shaft
When the tensions in the belt are P₁ and P₂, then find P₁-mv²/P₂-mv². The contact angle for smaller pulley is 156⁰, Groove angle is 36⁰ and coefficient of friction is 0.2.
(A). 6.21
(B). 4.66
(C). 5.83
(D). 5.36
(E). None of these
Answer: (C). 5.83
compute the angle of the wrap when the diameter of the two pulleys are 550mm and 300mm, and centre distance is 2800mm.
(A). 159.3⁰
(B). 167.8⁰
(C). 174.8⁰
(D). None of the mentioned
(E). None of these
Answer: (C). 174.8⁰
compute the arc of contact when the diameter of the two pulleys are 550mm and 300mm, and centre distance is 2800mm.
(A). 1.02
(B). 1.03
(C). 1.01
(D). 1.04
(E). None of these
Answer: (A). 1.02
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