In a transformer the resistance between its primary and secondary should be?

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asked Mar 19, 2018 by anonymous

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asked May 8, 2018 by anonymous

A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts

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Last answer: The secondary of a current transformer is always short-circuited under operating conditions because it avoids core saturation and high voltage induction.

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asked Sep 5, 2018 by anonymous

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Increasing the number of turns of wire on the secondary of a transformer will

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asked May 3, 2018 by anonymous

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asked May 17, 2018 by anonymous

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asked May 15, 2018 by anonymous

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asked Sep 6, 2018 by anonymous

State the meaning of absolute instrument and secondary instrument.

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asked Apr 29, 2018 by anonymous

Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the

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When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially

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asked Mar 25, 2018 by anonymous

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asked Mar 19, 2018 by anonymous

When a given transformer is run at its rated voltage but reduced frequency, its?

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asked Apr 9, 2018 by anonymous

A 1:5 step-up transformer has 120V across the primary and 600 ohms resistance across the secondary....

A 1:5 step-up transformer has 120V across the primary and 600 ohms resistance across the secondary. Assuming 100% efficiency, the primary current will be: (A) 0.2 Amp. (B) 5 Amps. (C)10 Amps. (D) 20 Amps

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asked Mar 20, 2018 by anonymous

In a capacitor start motor, the phase displacement between starting and running winding can be nearly?

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asked Mar 19, 2018 by anonymous

The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?

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asked Mar 19, 2018 by anonymous

A transformer oil must be free from?

Last answer: A transformer oil must be free from moisture.

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asked Mar 19, 2018 by anonymous

Iron loss of a transformer can be measured by?

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asked May 22, 2018 by anonymous

The primary winding of a 220/6 V, 50 Hz transformer is energised from 110 V, 60 Hz supply. The secondary

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asked Sep 6, 2018 by anonymous

State the meaning of secondary instrument. Classify secondary instruments.

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asked May 8, 2018 by anonymous

Which of the following connection of transformers will give highest value of secondary voltage ?

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

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asked Sep 6, 2018 by anonymous

Why CT is never operated with an open secondary ?

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asked Mar 10, 2018 by anonymous

What do you mean by secondary instruments?

Last answer: The instruments which will give the direct readings are called secondary instruments

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A 230 V/460 V single-phase transformer operating at 20 A and unity power factor has primary referred

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asked Mar 19, 2018 by anonymous

The dielectric strength of transformer oil is expected to be?

Last answer: The dielectric strength of transformer oil is expected to be 33 kV.

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asked Apr 11, 2018 by anonymous

One 200 V, 100 W bulb is connected in series with primary of a 200 V, 10 kVA transformer. If its secondary is...

One 200 V, 100 W bulb is connected in series with primary of a 200 V, 10 kVA transformer. If its secondary is kept open circuited, then the bulb would have (1) Full brightness (2) Poor brightness (3) A little less than full brightness (4) More than full brightness

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asked Apr 28, 2020 by anonymous

What do you mean by exciting resistance and exciting reactance?

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asked Mar 19, 2018 by anonymous

Greater the secondary leakage flux?

Last answer: Greater the secondary leakage flux less will be the secondary induced e.m.f.

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asked Mar 19, 2018 by anonymous

Reduction in core losses and increase in permeability are obtained with transformer employing?

Last answer: Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

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592 views 1 answer

asked Mar 21, 2018 by anonymous

For measuring a very high resistance we should use?

Last answer: For measuring a very high resistance we should use Meggar.

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86 views 1 answer

asked Jul 27, 2019 by anonymous

State and justify which of the following two transformers is better: Transformer A = 4% voltage regulation Transformer B = 6% voltage regulation

Last answer: Transformer A with 4% voltage regulation is better. Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

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102 views 1 answer

anonymous · Answer 1 · 2018-03-19T20:22:03+0000

In a transformer the resistance between its primary and secondary should be infinity.

In a transformer the resistance between its primary and secondary should be?

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