Electrical Measurements Mock Test 4

10%

Question 1 of 10

1. Two ammeters, one with a full-scale current of 1 mA and internal resistance of 100 Ω and other a full-scale current of 10 mA and internal resistance of 25 Ω are in parallel. What is the total current, these two meters can carry without the reading out of scale in any meter?

10 mA

11 mA

1 mA

5 mA

Question 1 of 10

Question 2 of 10

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

True

False

Question 2 of 10

Question 3 of 10

3. Pressure coil has no error.

False

True

Question 3 of 10

Question 4 of 10

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

primary voltage

secondary current

turns ratio

secondary current

Question 4 of 10

Question 5 of 10

5. A current of – 8 + 6\(\sqrt{2}\) (sin (ωt + 30°)) A is passed through three meters. The respective readings (in ampere) will be?

-8, 2 and 2

8, 6 and 8

8, 6 and 10

– 8, 10 and 10

Question 5 of 10

Question 6 of 10

6. In D.C. circuits, power is measured using ________

ammeter and galvanometer

ammeter and voltmeter

ohmmeter and galvanometer

ohmmeter and voltmeter

Question 6 of 10

Question 7 of 10

7. Low power factor wattmeters are designed to ________

have a low torque

have a medium torque

have no torque

have a high torque

Question 7 of 10

Question 8 of 10

8. Driving system in an induction type single phase energy meter consists of _________

two electromagnets

one magnet

ten magnets

five electromagnets

Question 8 of 10

Question 9 of 10

9. A 1000/5 A, 50 Hz correct transformer has a secondary burden comprising a non-inductance of 2Ω. What is the ratio error, if the iron loss is 3 W and magnetizing mmf is 250 A?

5.7%

3.6%

4.8%

Question 9 of 10

Question 10 of 10

10. Mumetal has ________

medium permeability, high loss

high permeability, medium loss

high permeability, low loss

low permeability, high loss

Question 10 of 10