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Test: DC Machine Applications - Electrical Engineering (EE) MCQ


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15 Questions MCQ Test Electrical Machines - Test: DC Machine Applications

Test: DC Machine Applications for Electrical Engineering (EE) 2024 is part of Electrical Machines preparation. The Test: DC Machine Applications questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: DC Machine Applications MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: DC Machine Applications below.
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Test: DC Machine Applications - Question 1

Inspite of heavy initial investments, dc motors are used due to

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The control of dc machines is very much simplified when compared to other machines. So this makes it very useful when compared.

Test: DC Machine Applications - Question 2

Separately excited dc generators are used in

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Separately excited dc generators are used in Ward leonard system of speed control.

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Test: DC Machine Applications - Question 3

 Maximum torque in dc series motor is limited by

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Commutation is the process which reduces the induced emf and so the torque.

Test: DC Machine Applications - Question 4

 Hoists, cranes and battery powered vehicles use _________ motors in the locomotive.

Detailed Solution for Test: DC Machine Applications - Question 4

Hoists, cranes require large starting torque which can be provided by dc series motor.

Test: DC Machine Applications - Question 5

There is an application which required pulsating loads, punch presses. The most preferred machines would be

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 It is compound machine whose flux can varied higher as well as lower in order to have variable torques.

Test: DC Machine Applications - Question 6

The manufacturer has mentioned a medium starting torque and 15% speed regulation. The most appropriate motor for his requirement is

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The dc shunt motor provides a medium values of the torque.

Test: DC Machine Applications - Question 7

Centrifugal pumps, fans-blowers use

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 Centrifugal pumps, fans-blowers use shunt as well as induction motor.

Test: DC Machine Applications - Question 8

Most commercial compound dc generator are normally supplied by manufacturers as over compound machines because

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 It is usually over compounded so that degree of compounding can be adjusted by diverters across series field.

Test: DC Machine Applications - Question 9

 Which of the following are applied with differential compound motor?

Detailed Solution for Test: DC Machine Applications - Question 9

Practically it is never used as the speed can rise very high.

Test: DC Machine Applications - Question 10

Most commercial compound dc generator are normally supplied by manufacturers as ______ compounded machines.

Detailed Solution for Test: DC Machine Applications - Question 10

Most commercial compound dc generator are normally supplied by manufacturers as over compounded.

Test: DC Machine Applications - Question 11

Long back ago, magnetic casette were in use, having permanent magnet dc motors which had

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PMDC motors have field fixed on the stator and rotor has coils.

Test: DC Machine Applications - Question 12

. If a dc shunt motor is stopped by forcing starter handle back to OFF position, then

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The sparking will occur at the last stud not all the studs of the starter.

Test: DC Machine Applications - Question 13

 Interpoles are used to start the dc motor above the base speed.

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 Interpoles do not reduce the flux across the windings, hence the speed does not rise above base speed.

Test: DC Machine Applications - Question 14

A 200 V dc motor has external resistances of Ra and Rf in armature and field circuits respectively. The starting current is reduced when

Detailed Solution for Test: DC Machine Applications - Question 14

When Ra is maximum and Rf minimum then the current to the armature is reduced. And hence the sparkings are reduced while starting.

Test: DC Machine Applications - Question 15

A d.c. generator has been provided tappings on the armature winding at intervals of 120 degrees from the side of commutator. The connection will be

Detailed Solution for Test: DC Machine Applications - Question 15

Dc generator if has displaced by 120 degrees physically then it will be act as ac machine.

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