Mechanical Engineer MCQs Preparation

By: Prof. Fazal Rehman Shamil

PPSC Mechanical Engineer MCQs Preparation

Is it possible to lower the centre distance as much as we wish?
(A). Yes power transmission increases
(B). Can’t be cited
(C). No
(D). None of these

Multiple Choice Question Answer: (C). No

The diameter of the shorter pulley in leather belt drive is 265mm. It is rotating at 1440 rpm than compute the velocity of the belt.
(A). 20m/s
(B). 25m/s
(C). 30m/s
(D). None of the above

(E). None of these

Multiple Choice Question Answer: (A). 20m/s

Velocity ratio for chain drive is lesser than that for belts.
(A). Yes
(B). Can’t be determined
(C). In some cases
(D). No

(E). None of these

Multiple Choice Question Answer: (D). No

Fabric rubber belts are not mostly used as they can’t be work at high speeds.
(A). They can’t be used at velocities 50m/s
(B). None of the listed
(C). Limiting velocity is 20m/s
(D). They can be used at high velocities

(E). None of these

Multiple Choice Question Answer: (D). They can be used at high velocities

The layer of a belt is generally known as
(A). Sediment
(B). Layer
(C). Segment
(D). Ply

(E). None of these

Multiple Choice Question Answer: (D). Ply

Power transmitting capacity of V belts is more than that of flat belt.
(A). Only for V angle > 15
(B). No
(C). Yes
(D). None of the listed

(E). None of these

Multiple Choice Question Answer: (C). Yes

Select the optimum velocity of the belt for maximum transmission is define by √P/6m.
(A). Yes
(B). by replacing 6 by 3
(C). No,
(D). None of the listed

(E). None of these

Multiple Choice Question Answer: (C). No,

the loose side is generally kept on the bottom in the horizontal belt,
(A). False
(B). True

(E). None of these

Multiple Choice Question Answer: (A). False

Select about the following statement “Vertical drives are preferred over horizontal”.
(A). False
(B). True

(E). None of these

Multiple Choice Question Answer: (A). False

The law of belting states that the centreline of the belt ifit approaches a pulley should not reside in the midplane of the pulley.
(A). False
(B). True

(E). None of these

Multiple Choice Question Answer: (B). True

It is possible to use the belting reverse direction without violating the law of belting.
(A). True
(B). False

(E). None of these

Multiple Choice Question Answer: (B). False

Creep is the slight absolute motion of the belt as it passes over the pulley.
(A). Yes
(B). It is absolute motion
(C). None of the listed
(D). No, it is a relative motion

(E). None of these

Multiple Choice Question Answer: (D). No, it is a relative motion

A shorter centre distance usually has favour in belt drives.
(A). Yes due to instability
(B). No due to stability
(C). yes due to stability
(D). No due to instability

(E). None of these

Multiple Choice Question Answer: (C). yes due to stability

When the velocity ratio is less than 3, then the centre distance is defined by D+.5d.
(A). False
(B). True

(E). None of these

Multiple Choice Question Answer: (A). False

When the velocity ratio is greater than 3, then the centre distance is defined by 2D.
(A). By 3D
(B). By 5D
(C). By 4D
(D). By D

(E). None of these

Multiple Choice Question Answer:(D). By D