Question

Assertion :A liquid rheostat is a type of variable resistor,which may be used as a dummy load or as a starting resistor for large slip ring motors. Reason: The salt water rheostat operates at unity power factor and presents a resistance with negligible series inductance compared to a wire wound equivalent.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

$\to$ Assertion: a liquid rheostat is a type of variable resistor which may be used as a dummy load or as a starting resistor for large slip ring motors.

In the simplest form, it consists of a tank containing brine or other electrolyte solution in which electrodes are submerged to create an electrical load.

The electrodes may be raised or lowered into the liquid to respectively decrease or increase the electrical resistance of the load.

$\to$ Reason: The salt water rheostat operates at unity power factor and presents a resistance with negligible series inductance compared to a wire wound equivalent and was widely used by generator assembler.

hence assertion and reason both are correct. And reason is correct explanation for assertion.