ER-2241

Quiz by Kaitlyn Hickey, updated more than 1 year ago
 Created by Kaitlyn Hickey over 2 years ago
11
3

Description

Quiz on ER-2241, created by Kaitlyn Hickey on 02/14/2018.

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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