Module-6 Synchronizing of Alternators (2nd)

 177 : What is the necessity of syncronising of alternators?

A : To increase the voltage
B : To increase the voltage
C : To meet the increased power demand
D : Top minimise the current

178 : Which is the condition for paralleling of two alternators?
A : Frequency must be same
B : Frequency must be same
C : Rating must be same
D : Phase sequence must be different

179 : What is the condition of incoming alternators voltages for synchronising of alternators?
A : Out put voltage of alternators must be different
B : Out put voltage of alternators must be different
C : Voltage of incoming alternator must be more
D : Incoming voltage of alternator must be less

180 : When the three lamps used in dark lamp method will light and go out simultaneously?
A : Frequencies of machines are different
B : Frequencies of machines are different
C : Speed of alternators are same
D : Out put voltage of alternators are same

181 : What is the use of dark and bright lamp method?
A : To start the alternator
B : To start the alternator
C : For synchronising of alternators
D : To change the excitation

182 : Which instrument is used for parallel operation of alternators?
A : Synchroscope
B : Synchroscope
C : Phase sequence meter
D : Centre zero ammeter

183 : What is the purpose of synchroscope for synchronising of alternators?
A : To check the voltages
B : To check the voltages
C : Indicate the difference in voltage and phase sequence
D : To indicate the exact time for synchronising

184 : What basis the load is shared by the two alternators after synchronised?
A : Sharing the load equally irrespective of KVA ratings
B : Sharing the load equally irrespective of KVA ratings
C : Based on the proportion of their KVA ratings
D : Sharing the load according to their voltage ratings