ONLINE MCQ EE AND ECE-Measurements and Instrumentation Part 15

1. A megger indicates infinity when test terminals are open-circuited. This is because:
a) No current flows through the current coil
b) No current flows through the pressure coil
c) No current flows through the compensating winding
d) Current does not flow through current coil and pressure coil

Answer  
2. Potentiometer is an __ instrument:

a) Indicating
b) Comparison
c) Calibrating
d) Recording

Answer  

3. Which of the following bridge is frequency sensitive:
a) Wheatstone bridge
b) Maxwell bridge
c) Anderson bridge
d) Wien bridge

Answer  
4. Tesla coil is a ___ transformer:

a) Coreless
b) Cascaded
c) Low impedance
d) High frequency resonant

Answer 

5. Direct current is preferred over alternating current for testing of ac transmission lines and cables because:
a) Heavy charging currents will be drawn and so a large sized transformer is required if tested with ac
b) Transmission lines and cables should not be tested with dc
c) The transformers required for testing cannot be used for long distances
d) All the above

Answer  
6. Anderson Bridge is used to measure:
a) L
b) C
c) V
d) I

Answer  
7. Hay’s Bridge is suitable for the measurement of:
a) Inductances with Q>10
b) Inductances with Q<10
c) Capacitors with high dissipation factor
d) Capacitors with low dissipation factor

Answer  
8. The frequency can be measured by using:
a) Wien’s bridge
b) De Sauty’s bridge
c) Schering’s bridge
d) Anderson’s bidge

Answer  
9. The ballistic galvanometer is usually lightly damped so that:
a) It may oscillate
b) It may remain stable
c) Amplitude of the first swing is large
d) Amplitude of the first swing is small

Answer  
10. B-H Curve is used to determination of:
a) Hysteresis loss
b) Iron loss
c) Eddy current loss
d) Both (a) and (b)

Answer

CURRENT AFFAIRS UPDATE- 2017
ONLINE MCQ EE AND ECE-Measurements and Instrumentation Part 14

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