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Test: Rotating Amplifiers - Electrical Engineering (EE) MCQ


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15 Questions MCQ Test Electrical Machines - Test: Rotating Amplifiers

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

The rotating amplifiers are widely used in

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The rotating amplifiers are applicable in feedback systems giving large amplified outputs.

Test: Rotating Amplifiers - Question 2

The quantity which make rotating amplifier applicable in large power levels is/are

Detailed Solution for Test: Rotating Amplifiers - Question 2

The rotating amplifiers have stable transient conditions, which makes them favourable to use in high power sectors.

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Test: Rotating Amplifiers - Question 3

The ordinary dc machines are not favourable as amplidynes due to

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The sluggish transient response of the ordinary dc machines makes them inappropriate to use them in amplidynes.

Test: Rotating Amplifiers - Question 4

In rotating amplifiers, armature reaction mmf of the first stage is made to act as field flux for second stage.

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Yes, the reaction mmf of the first stage is made to act as field flux for second stage to have faster transient response.

Test: Rotating Amplifiers - Question 5

 The cross field machines have

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The cross field machines have two fluxes electrically in quadrature.

Test: Rotating Amplifiers - Question 6

 In cross field rotating amplifiers, there is

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There are two stages for flux generators in order to have faster response in the system.

Test: Rotating Amplifiers - Question 7

 Metadyne is _________ feedback with respect to main ___________

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Metadyne is negative feedback with respect to main current flowing in the second stage set of motors.

Test: Rotating Amplifiers - Question 8

An amplidyne, d-axis flux is always neutralized due to

Detailed Solution for Test: Rotating Amplifiers - Question 8

The d-flux is neutralized by compensating winding at all possible loads as the same flux will be produced but in the opposite direction so as to cancel the flux.

Test: Rotating Amplifiers - Question 9

 In amplidynes, the resultant d-axis flux is

Detailed Solution for Test: Rotating Amplifiers - Question 9

 The resultant d-axis flux lies along the main field poles and are so field flux. The d- axis is completely under the control of field winding and is unaffected by direct axis current.

Test: Rotating Amplifiers - Question 10

 Amplidynes are best applicable in

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Amplidynes find applications in feedback systems with large power handling requirements.

Test: Rotating Amplifiers - Question 11

Interpoles provide mmf more than armature mmf in a dc machine.
 

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 Interpoles nullify armature cross magnetizing flux and the reactance voltage. So it is more than the armature mmf for a good efficient machine.

Test: Rotating Amplifiers - Question 12

The delay of the commutation occurs due base cause of emf induced due to

Detailed Solution for Test: Rotating Amplifiers - Question 12

The commutation in dc machines is delayed because of the emf induced in the coils and the mutual interaction of the field with neighbour coils.

Test: Rotating Amplifiers - Question 13

I. DC shunt motor – variable speed application
II. DC compound generator – constant supply voltage
III. Differentially compounded motor – welding purposes
Above are the applications of the dc machines , but all are not matched correctly. Choose the wrong marking

Detailed Solution for Test: Rotating Amplifiers - Question 13

Differentially compounded generators are used for welding purposes, not motors.

Test: Rotating Amplifiers - Question 14

 I. DC shunt motor – Lathe machine
II. DC compound generator – Drilling machine
III. Differentially compounded generator – welding purposes
Above are the applications of the dc machines, but all are not matched correctly. Choose the wrong marking

Detailed Solution for Test: Rotating Amplifiers - Question 14

DC compound generators are used for maintaining constant voltage across the terminals.

Test: Rotating Amplifiers - Question 15

 Mark the order for the decreasing order of the voltage regulation for dc generators

Detailed Solution for Test: Rotating Amplifiers - Question 15

Dc shunt motor is almost constant speed generator and thus its voltage regulation is very good than all and differential compound generator has most poor v.r.

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