Specifications

4. When is the 3-phase load said to be balanced?

5. Two wattmeter method of power measurement can be used for 3-phase, 3-wire system for

both balanced and unbalanced loads. Say TRUE or FALSE.

Part - C

Answer the following questions briefly (4 Marks)

1. Explain briefly the construction and application voltage tester.

2. Explain briefly the application of multimeter to perform open circuit and short circuit test.

3. What is importance of insulation testing? State the causes of insulating material deterioration

4. Explain with suitable circuit, the measurement of power in 1-phase AC circuit. Also deduce

an expression for power factor from the wattmeter reading.

5. Distinguish between balanced and unbalanced load.

6. Single wattmeter is sufficient to measure power for 3-phase balanced load. Justify this

statement.

Part - D

Answer the following questions in one page level (10 Marks)

1. Explain briefly the application of i) voltage tester and ii) multimeter

2. Using relevant circuits, explain briefly the suitable method of power measurement for

i) 3-phase, 3 wire balanced load and ii) 3-phase, 3 wire unbalanced load.