Objective Transformers Questions – Electrical Engineering

#1📜 EE Pre-Board August 2012📘 PowerhouseEasy

What is the purpose of using oil in the transformer?

Ainsulation

Bcooling

Ccooling and insulation

Dlubrication

#2📜 EE Pre-Board March 2013📘 PowerhouseEasy

Wye-wye power transformers are protected by current transformers having ________ connection.

Adelta-delta

Bwye-delta

Cdelta-wye

Dwye-wye

#3📜 EE Pre-Board August 2013📘 PowerhouseEasy

Transformers are rated in

AKW

BKV

CKWHR

DKVA

#4📜 EE Pre-Board August 2013📘 PowerhouseEasy

A 2,400/240 volt transformer is connected Y-Δ. What is the base voltage of the secondary?

A415.69 v

B240 v

C135.56 v

D480 v

#5📜 EE Pre-Board March 2014📘 PowerhouseEasy

Wye-wye power transformers are protected by current transformers having ______ connection.

AΔ − Δ

BY − Δ

CΔ − Y

DY − Y

#6📜 EE Pre-Board August 2014📘 PowerhouseEasy

Which of the following relays is used in transformers?

ABuchholz relay

BMho relay

CMerz- Price relay

DTranslay relay

#7📜 EE Pre-Board March 2016📘 PowerhouseEasy

What will happen to the current of a transformer when the temperature of the transformers winding increases?

Aremains unchanged

Bincreases

Cdecreases

Ddramatically unchanged

#8📜 EE Pre-Board March 2016📘 PowerhouseEasy

Transformers are used to change the value of the following EXCEPT

AAlternating current

BAlternating voltage

Cpower

Dresistance

#9📜 EE Pre-Board March 2017📘 PowerhouseEasy

Which is not a characteristic of an ideal transformer?

Afinite permeability

Binfinite permeability

Cno losses

Dno leakage flux

#10📜 EE Pre-Board March 2017📘 PowerhouseEasy

Conservator of a transformer consists of

Aan air-tight metal drum fixed at the top of the tank

Bdrum placed at the bottom of the tank

Coverload protection

Dnone of these

#11📜 EE Pre-Board March 2017📘 PowerhouseEasy

A transformer breathes in when

Aload on it increases

Bload on it decreases

Cload remains constant

Dnone of these

#12📜 EE Pre-Board August 2017📘 PowerhouseEasy

Ideal transformer assumptions do not include

Azero winding resistance

Binfinite core permeability

Cno leakage flux

Da finite magnetizing current

#13📜 EE Pre-Board March 2018📘 PowerhouseEasy

Its primary purpose is to provide a ground source.

Azig-zag transformer

Bsectionalizer

Csurge arrester

Dtertiary transformer

#14📜 EE Pre-Board August 2018📘 PowerhouseEasy

In transformers, the

Ahigh tension winding is used near the core

Bhigh tension winding is used away from the core

Clow tension winding is used near the core

Dlow tension winding is used away from the core

#15📜 EE Pre-Board August 2018📘 PowerhouseEasy

Open circuit test on transformer is conducted to determine

Ahysteresis loss

Bcopper loss

Ccore loss

Deddy current loss

#16📘 EE Pocket Reviewer RojasEasy

Which of the following is the reason why the core of a transformer is heating up when the primary windings is connected to a supply voltage?

AReluctance of the core

BPermeability of the core

CHysteresis loss

DFerromagnetism

#17📘 EE Pocket Reviewer RojasEasy

A transformer will work on what type of voltage?

Adc only

Bac only

CBoth dc and ac

DAny kind of supply voltage

#18📘 EE Pocket Reviewer RojasEasy

For successful parallel operation of two single phase transformers, which one is the most essential condition required?

APercentage impedance are equal

BTurn ratios are equal

CkVA ratings are equal

DPolarities are properly connected

#19📘 EE Pocket Reviewer RojasEasy

Which one is true about an ideal transformer?

AThe windings has no resistances

BThe core has no losses

CThe core has infinite permeability

DAll of these

#20📘 EE Pocket Reviewer RojasEasy

Which of the following are the same for both primary and secondary windings in a transformer?

ACurrents and induced emfs

BAmpere-turns and voltage per turn

CResistances and leakage reactances

DNone of these

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