Electrical Measurements Mock Test 1

10%

Question 1 of 10

1. What is the main source of error in a null detector?

lower current detection ability

insufficient sensitivity of the null detector

wiring resistance

power dissipation

Question 1 of 10

Question 2 of 10

2. The application of a megger is _________

to test for leakage

to limit the current

to increase the emf of the circuit

to measure resistance

Question 2 of 10

Question 3 of 10

3. How to minimize the drift in the value of resistance measured using a Wheatstone bridge?

by keeping the lead wire resistances within 0.2 mΩ

by using a high precision null detector

by minimizing the flow of current

by using a e.m.f source of minimum value

Question 3 of 10

Question 4 of 10

4. In the following figure, what is the value of I?

I = I_V + I_r

I = I_V I_r

I = I_V - I_r

I = ^I_V ⁄ _{I_r}

Question 4 of 10

Question 5 of 10

5. When is the bridge circuit balanced?

When voltage is applied

When current flows through the opposite ends of the bridge circuit

When no current flows through the galvanometer

When impedance is minimum

Question 5 of 10

Question 6 of 10

6. Why can’t a Kelvin bridge be used for the measurement of low Quality factor value?

due to balance problem

due to thermoelectric effect

due to temperature

due to the dull detector used

Question 6 of 10

Question 7 of 10

7. What is the relation between the sensitivity and deflection for a galvanometer?

directly proportional

depends on the type of galvanometer used

independant of each other

inversely proportional

Question 7 of 10

Question 8 of 10

8. D.C. bridges are used for _________

measurement of inductance

measurement of capacitance

measurement of resistance

measurement of current

Question 8 of 10

Question 9 of 10

9. Kelvin bridge can be calibrated to read _________

capacitance only

inductance and Quality factor value

current and frequency

power and voltage

Question 9 of 10

Question 10 of 10

10. The opposite two ends of a Wheatstone bridge consist of _________

e.m.f and null detector

resistance and capacitance

voltage and current source

inductance and impedance

Question 10 of 10