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ER-2241

Description

Quiz on ER-2241, created by Kaitlyn Hickey on 14/02/2018.
Kaitlyn Hickey
Quiz by Kaitlyn Hickey, updated more than 1 year ago
Kaitlyn Hickey
Created by Kaitlyn Hickey about 6 years ago
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3
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Resource summary

Question 1

Question
Suitable brush pressure for DC generators is usually between_____
Answer
  • 1 & 2 psi
  • 2&3 psi
  • 3&4 psi
  • 4&5 psi

Question 2

Question
In the case of a generator, the voltage regulation is determined by the resistance of the _______
Answer
  • Field winding
  • Shunt winding
  • Armature winding
  • Compensation winding

Question 3

Question
The value of field resistance that will limit field current to a value insufficient for voltage build up is called_____
Answer
  • Saturation resistance
  • Critical field resistance
  • Zero output limit
  • Field saturation

Question 4

Question
Interpole coils consist of ______
Answer
  • Small number of turns of large gage wire
  • Small number of turns of small gage wire
  • Large number of turns of large gag wire
  • Large number of turns of small gage wire

Question 5

Question
Interpole coils are connected
Answer
  • Across the armature
  • Across the series field
  • In series with the armature
  • In series with the shunt field

Question 6

Question
A 100KW DC generator is operating at full load; it requires 125KW to turn the generator. What is the efficiency of the generator?
Answer
  • 30%
  • 50%
  • 80%
  • 95%

Question 7

Question
The position at which there is no voltage in the armature is
Answer
  • Equalizer area
  • Excitation
  • Neutral plane
  • Location of the field poles

Question 8

Question
Which of the following is not a type of DC generator
Answer
  • Compound
  • Electro-magnetic
  • Shunt
  • Series

Question 9

Question
The winding that provides high voltage and low current is
Answer
  • Frog-leg
  • Lap wound
  • Wave wound
  • Lap-wave wound

Question 10

Question
The winding that provides moderate voltage and current is?
Answer
  • Frog-leg wound
  • Lap wound
  • Wave wound
  • Lap-wave wound

Question 11

Question
The item that ride against the commutator to make electrical connection are
Answer
  • Field windings
  • Armature windings
  • Brush
  • Pole pieces

Question 12

Question
The magnetic field is sometimes provide by electromagnets. This is done by windings that are wound around the
Answer
  • Brushes
  • Pole piece
  • Armature
  • Case

Question 13

Question
A device that converts mechanical input into DC electrical output is a
Answer
  • Alternator
  • Generator
  • Motor
  • Inverter

Question 14

Question
The rotating part of the generator is called the
Answer
  • Stator
  • Field
  • Armature
  • Exciter

Question 15

Question
The components of a DC generator that converts the armature AC and DC is the
Answer
  • Commutator
  • Alternator
  • Converter
  • Field

Question 16

Question
The winding that provides low voltage and high current is
Answer
  • Frog-leg wound
  • Lap wound
  • Wave wound
  • Lap-wave wound

Question 17

Question
In a compound generator, the setting of the setting of the amount of current in the series and shunt field windings determine the
Answer
  • Complexing
  • Compounding
  • Exciting
  • Differential

Question 18

Question
In a generator the series field diverter is also called the
Answer
  • Series field shunt rheostat
  • Series field series rheostat
  • Series field exciter
  • Shunt field exciter

Question 19

Question
Counter-torque is caused by the magnetic attraction between the field poles and the
Answer
  • Statot
  • Stator winding
  • Interpole
  • Armature

Question 20

Question
Armature reaction is the bending of the stator magnetic field by the _____ magnetic field
Answer
  • Armature
  • Stator
  • Interpoles
  • Stator windings

Question 21

Question
Series field windings are connected in series with the armature. They are wound with
Answer
  • Many turns large wire
  • Many turns small wire
  • Few turns large wire
  • Few turns small wire

Question 22

Question
The output of a shunt generator is usually controlled by the amount of
Answer
  • Field excitation
  • Input voltage
  • Input torque
  • Armature excitation current

Question 23

Question
A generator contains both series and shunt windings is called a
Answer
  • Self-excited generator
  • Separately excited generator
  • Complex generator
  • Compound generator

Question 24

Question
A generator is self-exited when
Answer
  • An outside source of AC is used to produce magnetism in the pole pieces
  • An outside source of DC is used to produce magnetism in the pole pieces
  • An initial voltage is produced by residual magnetism in the pole pieces
  • An initial voltage is produced in the series field to increase voltage

Question 25

Question
The CEC states that a generator shall be equipped with an indicating switch or circuit breaker except when
Answer
  • The generator is compounding
  • The generator is equipped with a governor
  • The drive means can be readily shut down and is not in parallel
  • The generator is arranged in parallel

Question 26

Question
When a 2 pole circuit breaker is used to protect a 3 wire DC generator, it must be installed so as to disconnect
Answer
  • Each armature lead
  • each series field winding lead
  • Each shunt field winding leaf
  • Source power

Question 27

Question
At what point in a DC generator system must the ground be attached
Answer
  • Each armature lead
  • Individual service
  • On interior services
  • One or more supply stations

Question 28

Question
When a 4 pole circuit breaker is used to protect a 3-wire DC generator, the breaker must be connected
Answer
  • In series with the armature
  • In parallel with the armature
  • That it is actuated by the entire armature current
  • In parallel with the shunt field

Question 29

Question
When a DC machine is cumulative compound
Answer
  • The series and shunt field aid each other in the production of magnetism
  • The series and shunt field are connected in series with each other
  • The series and shunt field oppose each other in the production of magnetism
  • The series and shunt field are connected in parallel with each other
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