3) If it is required to bring the driven shaft to speed in a gradual manner, which type of device will be used ?

Answer is:

Clutch

Explanation:

A clutch is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft.
In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts). In these devices, one shaft is typically attached to an engine or other power unit (the driving member) while the other shaft (the driven member) provides output power for work. While typically the motions involved are rotary, linear clutches are also possible.
Clutch is used to bring the driven shaft to speed in gradual manner.

If it is required to bring the driven shaft to speed in a gradual manner, which type of device will be used ?

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4) If, in a belt drive, the sense of rotation of both the pulleys is the same, the drive used is

Answer is:

open belt drive

Explanation:

An open belt drive is used to rotate the driven pulley in the same direction of driving pulley. In the motion of belt drive, power transmission results make one side of pulley more tightened compared to the other side.

If, in a belt drive, the sense of rotation of both the pulleys is the same, the drive used is

5) Which one of the following statements is NOT true about cross belt drive ?

Answer is:

power transmission is less than open belt drive

Explanation:

Cross belt drive having parallel shafts rotating in opposite directions.
It is similar to open belt drive but the difference between these two belt drives are in crossed belt drive the direction of rotation is opposite to each other.
Here the pulleys are set up to offset position. By providing some misalignment between two pulleys.
Keep in mind one of the most important thing for Cross-belt drive application: It can be used anywhere where the high speed power transmission is required.