BCIT ELECTRICAL DC MACHINES LEVEL 3 EXAM
UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS | WITH COMPLETE QUESTIONS WITH
CORRECT ANSWERS |VERIFIED//GRADED A+//
100% PASS
A generator characteristic curve shows the effect of __________ on
__________.
B. Connected load on terminal voltage
3 multiple choice options
Which condition must be satisfied to obtain the desired performance
when connecting a generator?
B. Field coils must be connected with the proper polarity relative to the
armature
3 multiple choice options
Which NEMA terminal markings identify the armature, shunt field, and
series field?
A. A1-A2, F1-F2, S1-S2
3 multiple choice options
The terminal voltage of a shunt generator is controlled by:
C. A field rheostat
3 multiple choice options
What determines the amount of current that flows through an armature
in a generator?
,C. The impedance/resistance of the connected load
3 multiple choice options
Which factors cause terminal voltage to decrease as load increases in a
generator?
A. Armature IR drop and armature reaction
3 multiple choice options
Is the series generator considered a practical machine?
C. No, it has limited practical applications
3 multiple choice options
Why is it impractical to control the output of a series generator with a
field rheostat?
B. The rheostat would have to carry the full armature current, causing
high power losses
3 multiple choice options
Why is the no-load voltage of a series generator extremely low?
C. Little or no current flows through the series field at no load
3 multiple choice options
In a series generator, why does terminal voltage rise with increasing load?
B. Armature current increases, strengthening the series field flux
3 multiple choice options
How can the voltage characteristic of a series field coil be useful?
A. It can compensate for voltage drop in a compound generator
3 multiple choice options
A compound generator contains both:
B. Series and shunt fields
, 3 multiple choice options
The condition where the series field adds to the shunt field is called:
C. Cumulative compounding
3 multiple choice options
The condition where the magnetic flux of the series and shunt fields
oppose each other is called:
B. Differential compounding
3 multiple choice options
What is the difference between long-shunt and short-shunt connections?
C. Long-shunt connects the shunt field across the line; short-shunt
connects it across the armature only
3 multiple choice options
A compound generator with a relatively constant terminal voltage
characteristic is called:
B. Flat compound
3 multiple choice options
Line drop can be compensated for by using a generator that is:
D. Over compounded
3 multiple choice options
Which generator has the most severe drop in terminal voltage with load?
D. Differential compound generator
3 multiple choice options
When a DC generator is operating correctly, what should not occur at its
brushes?
B. Sparking or excessive arcing
UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS | WITH COMPLETE QUESTIONS WITH
CORRECT ANSWERS |VERIFIED//GRADED A+//
100% PASS
A generator characteristic curve shows the effect of __________ on
__________.
B. Connected load on terminal voltage
3 multiple choice options
Which condition must be satisfied to obtain the desired performance
when connecting a generator?
B. Field coils must be connected with the proper polarity relative to the
armature
3 multiple choice options
Which NEMA terminal markings identify the armature, shunt field, and
series field?
A. A1-A2, F1-F2, S1-S2
3 multiple choice options
The terminal voltage of a shunt generator is controlled by:
C. A field rheostat
3 multiple choice options
What determines the amount of current that flows through an armature
in a generator?
,C. The impedance/resistance of the connected load
3 multiple choice options
Which factors cause terminal voltage to decrease as load increases in a
generator?
A. Armature IR drop and armature reaction
3 multiple choice options
Is the series generator considered a practical machine?
C. No, it has limited practical applications
3 multiple choice options
Why is it impractical to control the output of a series generator with a
field rheostat?
B. The rheostat would have to carry the full armature current, causing
high power losses
3 multiple choice options
Why is the no-load voltage of a series generator extremely low?
C. Little or no current flows through the series field at no load
3 multiple choice options
In a series generator, why does terminal voltage rise with increasing load?
B. Armature current increases, strengthening the series field flux
3 multiple choice options
How can the voltage characteristic of a series field coil be useful?
A. It can compensate for voltage drop in a compound generator
3 multiple choice options
A compound generator contains both:
B. Series and shunt fields
, 3 multiple choice options
The condition where the series field adds to the shunt field is called:
C. Cumulative compounding
3 multiple choice options
The condition where the magnetic flux of the series and shunt fields
oppose each other is called:
B. Differential compounding
3 multiple choice options
What is the difference between long-shunt and short-shunt connections?
C. Long-shunt connects the shunt field across the line; short-shunt
connects it across the armature only
3 multiple choice options
A compound generator with a relatively constant terminal voltage
characteristic is called:
B. Flat compound
3 multiple choice options
Line drop can be compensated for by using a generator that is:
D. Over compounded
3 multiple choice options
Which generator has the most severe drop in terminal voltage with load?
D. Differential compound generator
3 multiple choice options
When a DC generator is operating correctly, what should not occur at its
brushes?
B. Sparking or excessive arcing
