Lag Adjustment Devices

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Lag Adjustment Devices”.

1. The energy meter always measures the load energy correctly.
a) True
b) False

2. Obtaining correct reading from the energy meter requires ______________
a) low resistance and iron losses
b) high resistance and iron losses
c) high resistance and low iron losses
d) low resistance and high iron losses

3. Phase angle can be made 90 degrees using ____________
a) lead circuit
b) lag circuit
c) special design
d) transformer

4. Shading coil consists of many thick turns.
a) True
b) False

5. Copper shading bands are _________
a) placed as resistance
b) placed as wire
c) placed outside the central limb
d) placed around central limb

6. As copper shading bands move up ________
a) more flux is induced
b) less flux is induced
c) intermediate flux is induced
d) no flux is induced

7. Shunt flux is made to lag the applied voltage using ________
a) lead circuit
b) lag adjustment
c) lead-lag circuit
d) transformer

8. At overloads, magnetic shunt ________
a) aids the series flux
b) diverts series flux
c) maintains zero flux
d) disables the shunt flux

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