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Test: D.C Machines & Transformers - 2 - Electrical Engineering (EE) MCQ


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25 Questions MCQ Test Electrical Engineering SSC JE (Technical) - Test: D.C Machines & Transformers - 2

Test: D.C Machines & Transformers - 2 for Electrical Engineering (EE) 2024 is part of Electrical Engineering SSC JE (Technical) preparation. The Test: D.C Machines & Transformers - 2 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: D.C Machines & Transformers - 2 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: D.C Machines & Transformers - 2 below.
Solutions of Test: D.C Machines & Transformers - 2 questions in English are available as part of our Electrical Engineering SSC JE (Technical) for Electrical Engineering (EE) & Test: D.C Machines & Transformers - 2 solutions in Hindi for Electrical Engineering SSC JE (Technical) course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: D.C Machines & Transformers - 2 | 25 questions in 50 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Electrical Engineering SSC JE (Technical) for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: D.C Machines & Transformers - 2 - Question 1

A cumulatively compounded long shunt motor isdriving a load at rated torque and rated speed.If the series field is shunted by a resistance equalto the resistance of the series field keeping the torque constant,

Test: D.C Machines & Transformers - 2 - Question 2

The efficiency of a power transformer is around

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Test: D.C Machines & Transformers - 2 - Question 3

When voltage is transformed from primary to secondary then it is _____.

Test: D.C Machines & Transformers - 2 - Question 4

If the applied voltage to a transformer primary isincreased by keeping the V/f ratio fixed, then the magnetizing current and the core loss will,respectively:

Test: D.C Machines & Transformers - 2 - Question 5

The applied voltage of a certain transformer isincreased by 75%; while the frequency of the applied voltage is reduced by 25%. The maximum core flux density will :

Test: D.C Machines & Transformers - 2 - Question 6

On no-load phasor diagram of transformer, thecore loss component of the current remains in phase with

Test: D.C Machines & Transformers - 2 - Question 7

At which condition of the transformer theequivalent circuit will be as shown in the figure ?

Test: D.C Machines & Transformers - 2 - Question 8

In a transformer, zero voltage regulation at full load s:

Test: D.C Machines & Transformers - 2 - Question 9

While performing the open-circuit and shortcircuit tests on a transformer to determine parameters the status of the low voltage (LV) and high voltage (HV) windings will be such that

Test: D.C Machines & Transformers - 2 - Question 10

A 2 kVA transformer has iron loss of 150 Wand full-load copper loss of 250 W. Themaximum efficiency of the transformer wouldoccur when the total loss is

Test: D.C Machines & Transformers - 2 - Question 11

Grain oriented laminated sheet steel intransformer reduces

Test: D.C Machines & Transformers - 2 - Question 12

The colour of fresh dielectric oil used intransformers is

Test: D.C Machines & Transformers - 2 - Question 13

Transformer oil must be free from

Test: D.C Machines & Transformers - 2 - Question 14

Conservator (for transformer) is used

Test: D.C Machines & Transformers - 2 - Question 15

The noise, in a transformer, caused by vibrationsof laminations set by magnetic forces, is termed as

Test: D.C Machines & Transformers - 2 - Question 16

Distribution transformers have core losses

Test: D.C Machines & Transformers - 2 - Question 17

In Scott connection, if the turns ratio of main transformer is K,

Test: D.C Machines & Transformers - 2 - Question 18

The copper loss is constant for

Test: D.C Machines & Transformers - 2 - Question 19

Current-versus time graph for an idealcommutation is a

Test: D.C Machines & Transformers - 2 - Question 20

The dummy coils in d.c. machines re useful to

Test: D.C Machines & Transformers - 2 - Question 21

In a series wound d.c. machine (generator ormotor), the series field winding consists of

Test: D.C Machines & Transformers - 2 - Question 22

A d.c. shunt motor takes 5A at 100 V whenrunning light. shunt field resistance is 50W and armature resistance is 0.2W. What is the driving power ?

Test: D.C Machines & Transformers - 2 - Question 23

If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

Test: D.C Machines & Transformers - 2 - Question 24

The armature resistance of a 6-pole lap woundgenerator is 0.05W. If the armature is rewoundusing a wave winding, the armature resistancewill be

Test: D.C Machines & Transformers - 2 - Question 25

A 4-pole, 500 V shunt motor has 720 wave connected conductors on its armature. The fullloadarmature current is 60 A and flux per poleis 0.03 Wb. The armature resistance is 0.2Wand contact drop per brush is 1V. What is the back e.m.f ?

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