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Module3.15Transformers(1of3)
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Eddy currents in a transformer can be reduced by.
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1 point
Option A. using a single solid piece of metal.
Option B. laminations.
Option C. using a special non metallic material.
Correct Answer is. laminations.
Explanation. NIL.
The point of coercivity occurs when the.
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1 point
magnetic flux is zero even though a magnetizing force is being applied.
magnetizing force reaches a peak positive or negative value.
magnetizing force applied causes the material to become magnetically saturated.
Transformer copper loss on full load is 220 Watts. On half load the loss will be.
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1 point
440 Watts.
110 Watts.
55 Watts.
A transformer should always have its.
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primary shorted or off load.
secondary shorted or on load.
secondary open circuit or on load.
A 4:1 step down transformer draws 115 V and 1 A. The output power will be.
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1 point
460 V at 0.25 A.
28.5 V at 16 A.
28.5 V at 4 A.
A Transformer has 4500 secondary turns and 750 primary turns. Its turns ratio is.
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1 point
1:6.
1/6.
6:1.
The primary winding of a 3-phase transformer.
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is delta wound.
could be either delta or star wound.
is star wound.
How can it be determined if a transformer winding has some of its turns shorted together?.
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measure the input voltage with an ohmmeter.
the output voltage will be high.
the transformer will get hot in normal operation.
Correct Answer is. the transformer will get hot in normal operation.
In a transformer, if the rate of change of current increases, the mutual inductance will.
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1 point
decrease.
remain the same.
increase.
What is the ratio of turns between the primary coil winding and the secondary coil winding of a transformer designed to triple its input voltage?.
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primary will have one-third as many turns as its secondary.
primary will have three times as many turns as its secondary.
primary will have twice as many turns as its secondary.
In a transformer core loss is 200 W and copper loss is 220W at no load. What is the core loss at full load?.
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1 point
200 W.
0 W.
220 W.
The secondary coil of a transformer has 1500 turns and 10 Ω resistance. The primary coil has 1kΩ resistance. How many turns does the primary coil have?.
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1 point
15,000.
1,500,000.
150,000
secondary winding of a transformer has an impedance of 10 ohms and 1500 turns. For the primary winding to have an impedance of 1 kilohm, how many turns must it have?.
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1 point
15,000.
1,500,000.
150,000
In a star wound primary transformer, how could you wind the secondary winding?.
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1 point
star only.
either delta or star.
delta only.
Eddy currents in a transformer core are reduced by.
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decreasing the thickness of the laminates.
making the core from a solid block.
increasing the thickness of the laminates.
step up transformer has.
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two windings.
one winding.
three windings.
A transformer has an input of 400V and a ratio of 2:1. If the transformer is delta / star wound, what will the line voltage output be?.
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1 point
115V.
346V.
200V.
How many turns does the secondary winding of a 2:1 step-up transformer have?.
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1 point
Less than primary.
More than primary.
Less turns but with thicker wire.
A Transformer with 115V primary voltage and a ratio of 5:1 is supplying a landing light (load 24V 45 amps) is used, what is the current drawn?.
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205 amps.
4.5 amps.
9 amps.
To reduce eddy currents in a transformer you would.
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1 point
increase the thickness of laminations in the magnetic core.
reduce the number of turns on the primary winding.
reduce the thickness of laminations in the magnetic core.
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