Electrical Measurements Mock Test 3

10%

Question 1 of 10

1. What is the significance of capacitors in a Maxwell bridge?

they are cheap

they are used to block dc

they are used to block ac

they are expensive

Question 1 of 10

Question 2 of 10

2. In case of AC ammeters, shunts consist of __________

impedance

capacitance

inductance

resistance

Question 2 of 10

Question 3 of 10

3. The windings of a C.T. are ________

wound over one another

shorted

grounded

tied together

Question 3 of 10

Question 4 of 10

4. The four arms of an AC bridge network are as follows:

Arm AB: unknown impedance
Arm BC: standard capacitor C₂ of 1000pf
Arm CD: a non-inductive resistance of R of 100 Ω in parallel to a capacitor of 0.01 μF
Arm DA: a non-inductive resistance of 1000 Ω

The supply frequency is 50 Hz and connected across terminals B and D. If the bridge is balanced with the above value, determine the value of unknown Capacitance.

1000 pf

500 pf

10 pf

100 pf

Question 4 of 10

Question 5 of 10

5. The secondary winding of a P.T. has _________

a large number of turns

no turns at all

intermediate number of turns

a few turns

Question 5 of 10

Question 6 of 10

6. Which is the guarding arm?

parallel RC combination

series RC combination

capacitance C

resistance R

Question 6 of 10

Question 7 of 10

7. For a series RC circuit, what is δ?

voltage between series RC combination

voltage between series RC combination and C

voltage across C

voltage across R

Question 7 of 10

Question 8 of 10

8. How to minimize the effect of earth capacitance?

by increasing the supply voltage

by using a Wagner ground connection

by using an inductor across the circuit

by using a series resistance

Question 8 of 10

Question 9 of 10

9. Commercial Schering bridge can be used for the measurement of capacitances from _____________

25mF to 5F

10pF to 0.1nF

50nF to 10mF

100pF to 1μF

Question 9 of 10

Question 10 of 10

10. For a P.T. the nominal ratio is given by which of the following relation?

K_n = V_p(rated)

K_n = \(\frac{1}{V_{s(rated)}}\)

K_n = \(\frac{V_{s(rated)}}{V_{p(rated)}}\)

K_n = \(\frac{V_{p(rated)}}{V_{s(rated)}}\)

Question 10 of 10