Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: D.C Machines & Transformers - 1 - Electrical Engineering (EE) MCQ

Test: D.C Machines & Transformers - 1 - Electrical Engineering (EE) MCQ


Test Description

25 Questions MCQ Test - Test: D.C Machines & Transformers - 1

Test: D.C Machines & Transformers - 1 for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: D.C Machines & Transformers - 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: D.C Machines & Transformers - 1 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 - 1 below.
Solutions of Test: D.C Machines & Transformers - 1 questions in English are available as part of our course for Electrical Engineering (EE) & Test: D.C Machines & Transformers - 1 solutions in Hindi for Electrical Engineering (EE) 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 - 1 | 25 questions in 50 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: D.C Machines & Transformers - 1 - Question 1

If the number of conductors and speed of a lap wound generator is doubled then the generated emf will be

Test: D.C Machines & Transformers - 1 - Question 2

A transformer has an efficiency of 80% and works at 100 V, 4 kW. If the secondary voltageis 240 V, find the primary current.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: D.C Machines & Transformers - 1 - Question 3

A 2000/ 200V, 20 kVA ideal transformer has 66 turns in the secondary. The number of primaryturns is ......

Test: D.C Machines & Transformers - 1 - Question 4

The no-load primary current I0 is about ...... of full-load primary current.

Test: D.C Machines & Transformers - 1 - Question 5

A transformer takes a current of 0.6 A ad absorbs 64 W when the primary is connected to its normalsupply of 200 V, 50 Hz, the secondary being on open-circuit. The iron loss current is ..........

Test: D.C Machines & Transformers - 1 - Question 6

In Figure, the primary will see an impedance of .......

Test: D.C Machines & Transformers - 1 - Question 7

A 40 kVA transformer has iron loss of 450 W and full-load copper loss of 850 W. If the powerfactor of the load is 0.8 lagging, the full-load efficiency of the transformer is

Test: D.C Machines & Transformers - 1 - Question 8

How are transformers generally cooled for installations rated at less than 5 kVA ?

Test: D.C Machines & Transformers - 1 - Question 9

The full-load copper losses and iron losses of a transformer are 6400 W and 5000 Wrespectively. The copper loss and iron loss at half full-load will be respectively.

Test: D.C Machines & Transformers - 1 - Question 10

The transformer that does not provide electric isolation is

Test: D.C Machines & Transformers - 1 - Question 11

What is/ are the advantage/advantages of 3-phase transformer over 3 single-phase bank oftransformers ?

Test: D.C Machines & Transformers - 1 - Question 12

The autotransformer is preferably employed in situation where voltage transformetion ratio (K)is

Test: D.C Machines & Transformers - 1 - Question 13

The all-day efficiency of a transformer is also called its

Test: D.C Machines & Transformers - 1 - Question 14

To produce dynamically induced emf, the following is (are) necessary

Test: D.C Machines & Transformers - 1 - Question 15

Function of _____ is to collect current from the commutator and supply it to the external load.

Test: D.C Machines & Transformers - 1 - Question 16

A 6 pole wave wound d.c. generator has 460 armature conductors carrying armature current of 180 A. The armature reaction demagnetizing and cross magnetizing ampere turns per pole if brushes are shifted by 6 degree electrical from G.N.A are

Test: D.C Machines & Transformers - 1 - Question 17

The motor equation is given by

Test: D.C Machines & Transformers - 1 - Question 18

Armature reaction in a d.c. motor is increased......

Test: D.C Machines & Transformers - 1 - Question 19

A motor converts

Test: D.C Machines & Transformers - 1 - Question 20

Wave winding is employed in a dc machine of

Test: D.C Machines & Transformers - 1 - Question 21

The armature MMF waveform of a dc machine is

Test: D.C Machines & Transformers - 1 - Question 22

The compensating winding in a dc machine

Test: D.C Machines & Transformers - 1 - Question 23

The type of dc generator used for arc welding purposes is a

Test: D.C Machines & Transformers - 1 - Question 24

Which type of motors are preferred in lifts?

Detailed Solution for Test: D.C Machines & Transformers - 1 - Question 24

DC compound motors are preferred for lifts. Shunt type commutator motors are preferred in case of single phase installation. The latest lift designs use 3-phase slip ring induction motors with variable frequency drive electronic controls. Some may also use a similar system with permanent magnet (brush less) DC Motors.

Test: D.C Machines & Transformers - 1 - Question 25

What is the increase in torque expressed as percentage of initial torque, if the current drawnby a dc series motor is increased from 10 A to12 A (neglect saturation )?

Information about Test: D.C Machines & Transformers - 1 Page
In this test you can find the Exam questions for Test: D.C Machines & Transformers - 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: D.C Machines & Transformers - 1, EduRev gives you an ample number of Online tests for practice

Top Courses for Electrical Engineering (EE)

Download as PDF

Top Courses for Electrical Engineering (EE)