Wireman – Semester 3, Module 6

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Wireman – Semester 3, Module 6 - AC Generator

Common for Wireman Trade 2nd Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 : Which working principle AC generator? *

2 points

A : Faradays laws of electro magnetic induction

B : Ohms law

C : Lenzs law

D : Faradays laws of electrolysis

2: Which Emf is induced in a AC generator? *

2 points

A : Dynamically induced emf

B : Statically induced emf

C : Counter emf

D : Self induced emf

3: Which part rotates in large alternator? *

2 points

A : Field

B : Armature

C : Brush

D : Yoke

4 : Which material is used to construct armature core of alternator? *

2 points

A : Spring steel

B : Mild steel

C : Silicon steel

D : Forged steel

5: Which rotor is used in high speed alternator? *

2 points

A : Smooth cylindrical

B : Salient pole

C : Projected pole

D : Squirrel cage rotor

6: Which type of slots are used in armature core of alternator? *

2 points

A : Totally closed

B : Wide open

C : Semi closed

D : Semi open

7 : What are the terminal markings of a 3 phase star connected alternator? *

1 point

A : U, V, W and N

B : A, B, C and N

C : 1, 2, 3 and 4

D : X, Y, Z, N

8 : What is the phase displacement between three windings in an alternator? *

2 points

A : 120°

B : 90°

C : 360°

D : 180

9: Which type of rotor has small diameter and large axial length? *

2 points

A : Smooth cylindrical

B : Salient pole

C : Projecting pole

D : Squirrel cage

10: What is the excitation source of a large alternator? *

2 points

A : DC shunt generator

B : Rectifier

C : DC series generator

D : Battery

11: Which type of alternator is used for high speed operation? *

2 points

A : Salient pole alternator

B : Smooth cylindrical pure alternator

C : Projected pole alternator

D : Impulse turbo alternator

12:How the alternators are rated? *

2 points

A : KVA

B : KW

C : KVAR

D : KWH

13 : What is the Emf equation of an ideal alternator? *

1 point

14 : What is the formula for calculating total load on 3-phase alternator? *

1 point

15: What is the formula for voltage regulation of an alternator? *

1 point

16: What is the condition for voltage in parallel operation of 3-phase alternator? *

2 points

A : Must be same

B : Must be different

C : Must be low

D : Must be high

17 : Which is the condition for parallel operation of 3-phase alternator? *

2 points

A : Frequency must be same

B : Voltage must be different

C : Sequence must be different

D : Polarity must be different

18 : Why parallel operation of alternators is necessary? *

2 points

A : To get more voltage

B : To share more loads

C : To improve efficiency

D : To maintain constant frequency

19: Which method of synchronising is given? *

2 points

A : Dark lamp method

B : Bright lamp method

C : Synchroscope method

D : Two bright one dark method

20 : What method is used for parallel operation of alternator? *

2 points

A : Dark and bright lamp method

B : Ward - leonald method

C : Over excitation method

D : Under excitation method

21 : Which is the correct time of parallel operation of alternators in lamp method illustrated? *

2 points

A : All 3 lamps in dark

B : All 3 lamps in bright

C : Two lamps bright and one lamp dark

D : One lamp bright and two lamps dark

22 : How the 3 lamps glow under parallel operation of alternators in bright lamp method? *

2 points

A : All 3 lamps in dark

B : All 3 lamps in bright

C : Two lamps bright and one lamp dark

D : One lamp bright and two lamps dark

23: How many lamps are required for parallel operation of two 3 phase alternators? *

2 points

A : 3

B : 6

C : 8

D : 10

24 : What is the name of the instrument used to indicate the correct time for parallel operation of alternators? *

2 points

A : Megger

B : Phase sequence meter

C : Synchroscope

D : Centre zero ammeter

25 : Which is the exact instant of parallel operation of alternators in Weston synchroscope illustrated? *

2 points

A : Indicating the fast direction

B : Indicating the slow direction

C : Visible at its central position

D : Oscillating in between fast and slow

26 : Which instrument is the special form of power factor method? *

2 points

A : Synchroscope

B : Frequency meter

C : Wattmeter

D : Phase sequence meter

27 : Which is used in Weston type electro dynamo meter synchroscope? *

2 points

A : Iron vane

B : Fixed coil

C : Transformer

D : Permanent magnet

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