Design Features of Current Transformers

Electrical Measurements

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Design Features of Current Transformers”.

1. The secondary leakage reactance of a C.T. ____________
a) increases its ratio error
b) decreases its ratio error
c) has no effect on its ratio error
d) increases the impedance of the circuit

2. Secondary and primary windings consist of ________
a) copper turns
b) 14 S.W.G copper wire and copper strip respectively
c) iron coils wound around
d) laminations

3. Coils of a C.T. are separately wound.
a) True
b) False

4. The windings of a C.T. are ________
a) tied together
b) shorted
c) wound over one another
d) grounded

5. At high voltages, the current transformers are enclosed in a tank.
a) True
b) False

6. Turns compensation is used to obtain ________
a) to compensate the turns
b) to equalise the turns on the windings
c) to protect the equipment
d) transformation ratio equal to nominal ratio

7. What is the effect of reducing the secondary turns in a C.T. by 1%?
a) transformation ratio reduces by the same value
b) no effect
c) nominal ratio increase by the same value
d) secondary current increases by the same value

8. In a 1000/5 A C.T., the number of secondary turns would be ________
a) 200
b) 199 or 198
c) 5
d) 1000

9. In the ring type of core, the secondary winding is ________
a) non-uniformly distributed over the core
b) shorted with the primary winding
c) uniformly distributed over the core
d) connected in the form of a ring

10. In a shell type of core, the windings are ________
a) in the form of the shell
b) shorted with the primary windings
c) not wound
d) placed on the central limb

11. Mumetal has ________
a) low permeability, high loss
b) high permeability, medium loss
c) medium permeability, high loss
d) high permeability, low loss

12. Perminder has __________
a) medium saturation point of permeability
b) low saturation point of permeability
c) no saturation point of permeability
d) high saturation point of permeability

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