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- 1. Multiple Choice
What kind of machine is this:
Single phase AC shunt wound motor
Series wound DC generator
Shunt wound DC motor
Compound DC motor
- 2. Multiple Choice
The rotation direction of a series wound DC motor can be changed by:
Swapping the slip ring connections
Reversing the shunt windings
Swapping the shunt and series windings
Reversing the field windings or the armature windings.
- 3. Multiple Choice
What kind of machine is this:
Single phase AC series wound motor
Series wound DC motor
Shunt wound DC motor
Compound DC motor
- 4. Multiple Choice
Which one of the following motors is likely to race up to dangerously high speed if it is run with no load?
DC series wound motor
AC double-cage induction motor
DC shunt motor
AC synchronous motor
- 5. Multiple Choice
What type of starter circuit is shown here?
autotransformer
variable frequency drive
resistance starter
'soft start' starter
- 6. Multiple Choice
A 1 hp separately-excited DC motor has 0.5 ohm resistance and connected to a DC voltage of 150 V. Determine its armature current. Note, 1 hp is equal to 746 W.
3 A
5 A
1.5 A
6.5 A
- 7. Multiple Choice
A 1 hp separately-excited DC motor has 0.5 ohm resistance and connected to a DC voltage of 150 V. Determine the back-EMF in the armature. Note, 1 hp is equal to 746 W.
150 V
152.5 V
147.5 V
130 V
- 8. Multiple Choice
A shunt DC motor has 0.5 ohm armature resistance and 120 ohm field resistance. The motor is connected to a DC voltage of 120 V. Determine field winding current.
0.5 A
1 A
0.95 A
1.1 A
- 9. Multiple Choice
A shunt DC motor has 0.5 ohm armature resistance and 120 ohm field resistance. The motor draws 40 A when it is connected to a DC voltage of 120 V. Determine voltage induced in armature or back-EMF.
100 V
120 V
140 V
80 V
- 10. Multiple Choice
A 5 hp shunt DC motor has 0.5 ohm armature resistance and 120 ohm field resistance. The motor is connected to a DC voltage of 120 V. Determine its back-emf. Note, 1 hp is equal to 746 W.
100.5 V
110.5 V
125.5 V
104.5 V
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