Which of the following statements about the transformer or mechanical gear drive is INCORRECT?

Question

Question

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PGCIL DT Electrical 13 Aug 2021 Official Paper (NR I)

In mechanical gear drive, there is a perfect ratio between the number of teeth and the speeds of the two gears.
Mechanical gear drive transfers mechanical power from one joint to another.
Transformer transfers electrical power from one circuit to the other.
Power is transferred through the magnetic flux in transformer.

Answer 1

Transformer:

A transformer is an electrical device which transfers electrical energy from one circuit to another
It works based on the principle of electromagnetic induction
Power is transferred through the magnetic flux in transformer.
It is used for increasing or decreasing the amount of voltage or current as per our requirement based on these transformers are classified into two types step-up (increasing) or step-down (decreasing) transformer.

F1 J.K Madhu 23.06.20 D6

A transformer can be used to either increase or decrease the voltage of a circuit.
In other words, it can either step up (increase) or step down (decrease) the voltage.
A transformer is necessary because sometimes the voltage requirements of different appliances are variable.

Mechanical gear drive:

Mechanical power is transmitted from one shaft to another through belts, chains and gears and type is selected according to application.
In mechanical gear drive, there is a perfect ratio between the number of teeth and the speeds of the two gears.

Comparison of belt, chain and gear drive

Particulars	Belt drive	Chain drive	Gear drive
Main elements	Pulleys, belt	Sprockets, chain	Gear
Slip	Slip may occurs	No slip (positive drive)	No slip (Positive drive)
Suitability	For large centre Distance	For moderate centre distance	For short centre distance
Space requires	Large	Moderate	less
Design	Simplest	Simple	Complicated
Failure	Failure of belts does not cause the further damage of machine	Failure of chain may not seriously damage the machine	Failure of gear may cause serious break down in the machine
Life	Less	Moderate	Long
Lubrication	Not required	Require	Require proper
Use	For low VR	For moderate VR	For high VR
e.g.	Use as a first drive in transmission	Bicycle, Automobile	gear boxes, automobile