a) In an alternator, the armature reaction influences the magnitude of Wave form of generated voltage. O Flux O Terminal voltage per phase Speed of the machine OOC No load loss O

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.4P
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First question) Choose the correct a
nswer for all characters
a) In an alternator, the armature reaction
influences the magnitude of
Wave form of generated voltage. O
Flux
Terminal voltage per phase
Speed of the machine
No load loss
b) Brushless excitation system consisting
stator and rotor field winding and
power diodes
Stator field winding and power diodes
stator and rotor field winding and
capacitor
Everything mentioned in the options O
c) If input mech. Power of SG constant,
:the functionality of AVR is
Control terminal voltage O
Control Load angle O
Control flux and terminal voltage O
Control flux of rotor
d) What will happen if a stationary
alternator (off) is connected to a live
?power system
It is likely to run as a synchronous
motor
:of
It will decrease bus bar voltage O
It will get short circuited
It will disturb generated e.m.f. of other
paralleled alternators.
e) The winding of a 4-pole alternator
having 36 slots and a coil span of 1 to 8
.is short-pitched by............. degrees
90
40. O
150
O
20
00
f) A three phase synchronous generator
110 MVA, 11 KV, 50 Hz has synchronous
reactance of 1.5 p.u. the power angle -
------- when the synchronous
generator supplies 70 MW
19.46 O
11.46 O
110.46
21.46
17.46 O
g) Voltage generated per phase in an
alternator is proportional to
Flux per pole O
Frequency of waveform O
Everything mentioned in the options O
Winding factors O
Number of turns in armature O
h) The standard practice of synchronous
generator construction now a days is
to have
Rotating field O
Cylindrical field
Either of the above
Rotating armature O
i) To have two alternators in parallel.
which of the following factors should
?be identical for both
Voltage, frequency and phase
sequence
Frequency O
O
Voltage O
O
Phase sequence O
Voltage, frequency, phase sequence
and apparent power
j) Adjustment resistance in rotor system
will when three phase load
.decrease
Increase O
not change O
remain constant O
decrease O
Transcribed Image Text:First question) Choose the correct a nswer for all characters a) In an alternator, the armature reaction influences the magnitude of Wave form of generated voltage. O Flux Terminal voltage per phase Speed of the machine No load loss b) Brushless excitation system consisting stator and rotor field winding and power diodes Stator field winding and power diodes stator and rotor field winding and capacitor Everything mentioned in the options O c) If input mech. Power of SG constant, :the functionality of AVR is Control terminal voltage O Control Load angle O Control flux and terminal voltage O Control flux of rotor d) What will happen if a stationary alternator (off) is connected to a live ?power system It is likely to run as a synchronous motor :of It will decrease bus bar voltage O It will get short circuited It will disturb generated e.m.f. of other paralleled alternators. e) The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 .is short-pitched by............. degrees 90 40. O 150 O 20 00 f) A three phase synchronous generator 110 MVA, 11 KV, 50 Hz has synchronous reactance of 1.5 p.u. the power angle - ------- when the synchronous generator supplies 70 MW 19.46 O 11.46 O 110.46 21.46 17.46 O g) Voltage generated per phase in an alternator is proportional to Flux per pole O Frequency of waveform O Everything mentioned in the options O Winding factors O Number of turns in armature O h) The standard practice of synchronous generator construction now a days is to have Rotating field O Cylindrical field Either of the above Rotating armature O i) To have two alternators in parallel. which of the following factors should ?be identical for both Voltage, frequency and phase sequence Frequency O O Voltage O O Phase sequence O Voltage, frequency, phase sequence and apparent power j) Adjustment resistance in rotor system will when three phase load .decrease Increase O not change O remain constant O decrease O
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