Explore key concepts of DC machines, including winding types, parallel paths in lap winding, shunt compound generators, and their relationship with speed and applications like arc welding. This quiz assesses understanding of electromechanical principles crucial for professionals in electrical engineering.
I2R
IR2
V2/R
VI
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Number of poles
2
4
6
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2
4
8
16
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Armature
Shunt field
Full load
None of these
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Mechanical losses
Commutator losses
Iron losses and mechanical losses
Total copper losses
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Shunt
Series
Compund
Separately excited
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Direction of flux
Direction of induced e.m.f.
Direction of motion of conductor
Any of above
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Negative
Positive
Zero
1
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Compound generator
Self-excited generator
Series generator
Shunt generator
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220
200
150
120
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Variable losses = constant losses
Stray losses are = copper losses
Field copper losses = armature copper losses
Magnetic losses - windage loss.
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Series arc lighting
Voltage booster
Regenerative breaking
All of above
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Carbon
Copper
Mica
Ceramic
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BHPx746
BHP/746
BHPx764
BHP/764
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> VNL
< VNL
= VNL
= 2VNL
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To reduce eddy current loss
To reduce hysteresis loss
Ease of creating slots
To achieve high permeability
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(Po/Pi)x100
(Po/Po+Losses)x100
Both a & b
None of above
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1
2
4
6
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2%
20%
60%
80%
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A.c. square wave.
A.c. sinusoidal wave
Pure d.c
Pulsating d.c
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Long shunt
Short shunt
Differential
Commulative
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Deliver large share of the total load
Deliver small share of the total load
Run in the opposite direction
Run as a motor in the same direction
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To increase the series flux
To increase generated e.m.f.
To reduce the combined effect of armature reaction
To properly divide current on both genarators
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Low price
Exciting current is independent of load current
Low armature resistance
All of above
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Preogressive
Retrogressive
Simplex
Duplex
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Eg and Ia
Eg and IL
VT and Ia
VT and IL
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Lap winding
Wave Winding
Gram ring winding
Open winding
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Armature reaction
Reduced reactance voltage
Hardness of material
Low resistance
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Become half
Become double
Increase to four times
Remain constant
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Ia-Ish
IL
Ia
Ia+Ish
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