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Two generators A and B have 6 poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be
A
2 : 3
B
3 : 1
C
3 : 2
D
1 : 3
Correct Answer:
3 : 1
For a four pole, 16 slot armature with two coil-side/slot having lap connected progressive winding has single turn coils. The same machine is then wave wound, the emf induced in the lap wound dc machine to that of wave wound will be ________
A
2
B
0.5
C
1
D
4
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. What is the value of induced emf?
A
188 V
B
276 V
C
94 V
D
188 mV
A 4-pole lap wound generator with 720 armature conductors and a flux per pole of .003 Wb has an armature current of 50 A. The developed torque is _________
A
17.25 N-m
B
17.19 N-m
C
16.54 N-m
D
16.89 N-m
A 2-pole lap wound generator with 44 armature conductors and a flux per pole of .07 Wb has an armature current of 80 A. The developed torque is _________
A
39.7 N-m
B
39.2 N-m
C
38.4 N-m
D
37.2 N-m
Calculate the number of conductors on each pole piece required in a compensating winding for a 6-pole lap-wound dc armature containing 286 conductors. The compensating winding carries full armature current. Assume ratio of pole arc/ pole pitch = 0.7.
A
6
B
8
C
9
D
7
A 400-V, 1000-A, lap wound dc machine has 10 poles, 860 armature conductors. The number of conductors in the pole face to give full compensation if pole face covers 70% of pole span is?
A
3010
B
4300
C
2400
D
2800
If the terminal voltage of 220-V dc generator having armature resistance of 1 ohms. The induced emf produced is 200-V. The armature current for the above machine is?
A
20 A
B
-20 A
C
-10 A
D
10 A
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. What is the value of flux/pole?
A
0.188 Wb
B
18.88 Wb
C
0.0188 Wb
D
1.888 Wb
A 4-pole Dc wound machine is lap wound with 400 conductors. The pole shore is 20 cm long and average flux density over one-pole pitch is 0.4 T, the armature diameter being 30 cm. Here, motor is drawing 25 A current at 1500 rpm. What is the available torque (N-m) at shaft?
A
29.9
B
59.8
C
14.95
D
44.85
A 4-pole wave wound DC motor drawing an armature current of 20 A has provided with 360 armature conductors. If the flux per pole is 0.015 Wb then the torque developed by the armature of motor is _______
A
10.23 N-m
B
34.37 N-m
C
17.17 N-m
D
19.08 N-m