Advantages of Instrument Transformers

Electrical Measurements

This set of Electrical Measurements Problems focuses on “Advantages of Instrument Transformers”.

1. Instrument transformers can be easily replaced.
a) True
b) False

2. Instrument transformers provide _________
a) electrical isolation from low rated winding
b) electrical isolation from high rated winding
c) electrical isolation from medium rated winding
d) no electrical isolation at all

3. Instrument transformers give same readings irrespective of number of other instruments connected.
a) True
b) False

4. C.T. and P.T. are standardized at _________
a) 50 A and 220 V
b) 25 mA and 2.2 kV
c) 5 A and 110 V
d) 75 nA and 1.1 MV

5. A 5A ammeter can measure a current of upto 1000 A using a _________
a) 5/1000A C.T.
b) 1000A C.T.
c) 5A C.T.
d) 1000/5A C.T.

6. A 110V voltmeter can measure a voltage of upto 110kV using a _________
a) 110000/110V P.T.
b) 110000V P.T.
c) 110V P.T.
d) 110/110000V P.T.

7. How can the meter circuit be isolated from the power circuit?
a) by grounding
b) through electrical isolation
c) by physical separation
d) through mechanical isolation

8. How are instrument transformers different from shunts and multipliers?
a) they are all the same
b) they have transformers
c) readings are independent of component values
d) they can be used for high voltages and currents

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