Electrical Measurements Mock Test 4

10%

Question 1 of 10

1. A PT is a device which is ___________

Electromagnetically coupled

Electrically coupled

Electrostatically coupled

Conductively coupled

Question 1 of 10

Question 2 of 10

2. Ratio error in a P.T. depends on _________

turns ratio

secondary current

primary voltage

secondary current

Question 2 of 10

Question 3 of 10

3. Decrease in p.f. makes V_s to lead V_p.

True

False

Question 3 of 10

Question 4 of 10

4. In a P.T. values of components of currents are negligible.

True

False

Question 4 of 10

Question 5 of 10

5. A PMMC rated as 100 μA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?

18 kΩ/V

10 kΩ/V

9 kΩ/V

4.5 kΩ/V

Question 5 of 10

Question 6 of 10

6. Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?

10 kΩ/V and 10 kΩ/V

100 kΩ/V and 10 kΩ/V

10 kΩ/V and 100 kΩ/V

10 kΩ/V and 1 kΩ/V

Question 6 of 10

Question 7 of 10

7. Mumetal has ________

high permeability, medium loss

low permeability, high loss

high permeability, low loss

medium permeability, high loss

Question 7 of 10

Question 8 of 10

8. For a given V_p the V_s __________

increases

depends on the supply

remains constant

decreases

Question 8 of 10

Question 9 of 10

9. Dynamometer type wattmeter has _________

strong magnetic field

no magnetic field

weak magnetic field

intermediate magnetic field

Question 9 of 10

Question 10 of 10

10. At constant voltage how is frequency affected by flux?

remains constant

decreases with an increase in flux

increases with a decrease in flux

depends on the current

Question 10 of 10