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The voltage regulation of the transformer will be negative when the power factor angle (φ) is :

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MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper
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  4. φ > 0

Answer (Detailed Solution Below)

Option 1 :
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Voltage Regulation

Voltage Regulation of single-phase transformers is the percentage (or per unit value) change in its secondary terminal voltage compared to its original no-load voltage under varying secondary load conditions.

The voltage regulation is given by:

% 

Voltage regulation curve:

Explanation

The voltage regulation is calculated by:

For negative voltage regulation:

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More Regulation of a Transformer Questions

Q1.The voltage regulation of the transformer will be negative when the power factor angle (φ) is :
Q2.What is per unit regulation in a transformer when V20 is the secondary terminal voltage on no-load and V2 is the secondary terminal voltage on given load?
Q3.The ______ determines the ability of the transformer to provide the constant voltage for variable loads.
Q4.Which of the following power factor gives positive voltage regulation in transformer?
Q5.Determine the regulation of a transformer in which ohmic loss is 1% of the output and the reactance drop is 5% of the voltage when power factor is unity.
Q6.The poorest voltage regulation of a transformer at full load is:
Q7.The regulation of a two winding transformer is 5% at full load unity power factor. At full load 0.8 power factor lagging the regulation would be:-
Q8.A 10 kVA, 400 / 200 V single phase transformer with resistance 4 percent and reactance 6 percent supplies a current of 50 A a resistive load. Voltage across the load is:
Q9.Calculate the percentage voltage drop for a transformer with a percentage resistance of 2.5% and a percentage reactance of 5% of rating 500 KVA when it is delivering 400 KVA at 0.8 p.f. lagging.
Q10.A 200 / 440 V, 1 kVA transformer has impedance of Z = (R + j0.4) pu. The voltage regulation of transformer at full load 0.8 p.f lagging is 32%. Then the voltage regulation at half load 0.8 p.f leading is ____%

More Transformer Questions

Q1.What does the flux created by the load current in the primary winding, which links only with the primary winding, represent?
Q2.In distribution transformers, the explosion vent is designed to:
Q3.In the equivalent circuit without core losses, the magnetising branch consists of __________. 
Q4.The same polarity condition is essential in parallel operation because: 
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Q6.What effect does excessive heat in a transformer have on its windings?
Q7.For accurate voltage regulation calculation in a transformer, which of the following must remain constant?
Q8.How can polarity in transformers be verified?
Q9.In a transformer, the efficiency can be calculated with reasonable accuracy by knowing:
Q10.In a transformer, if the frequency of the supply voltage is increased, what happens to the induced voltage?
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Q1.If a 6-pole induction motor operates on a 60 Hz supply, its synchronous speed is _____________.
Q2.How are the segments of the commutator insulated from each other?
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