Wireman 2nd year mcq

Wireman – Semester 3 Module 6 – AC Generator
146 : What is the formula for calculating total load on 3-phase alternator?

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

148 : What is the condition for voltage in parallel operation of 3-phase alternator?
A : Must be same
B : Must be different
C : Must be low
D : Must be high

149 : Which is the condition for parallel operation of 3-phase alternator?
A : Frequency must be same
B : Voltage must be different
C : Sequence must be different
D : Polarity must be different

150 : Why parallel operation of alternators is necessary?
A : To get more voltage
B : To share more loads
C : To improve efficiency
D : To maintain constant frequency

151 : Which method of synchronising is given?

A : Dark lamp method
B : Bright lamp method
C : Synchroscope method
D : Two bright one dark method

152 : What method is used for parallel operation of alternator?
A : Dark and bright lamp method
B : Ward – leonald method
C : Over excitation method
D : Under excitation method

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

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

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

155 : How many lamps are required for parallel operation of two 3 phase alternators?
A : 3
B : 6
C : 8
D : 10

156 : What is the name of the instrument used to indicate the correct time for parallel operation of alternators?
A : Megger
B : Phase sequence meter
C : Synchroscope
D : Centre zero ammeter

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

A : Indicating the fast direction
B : Indicating the slow direction
C : Visible at its central position
D : Oscillating in between fast and slow

158 : Which instrument is the special form of power factor method?
A : Synchroscope
B : Frequency meter
C : Wattmeter
D : Phase sequence meter

159 : Which is used in Weston type electro dynamo meter synchroscope?
A : Iron vane
B : Fixed coil
C : Transformer
D : Permanent magnet