Electrical Machines Excitation Method Online Exam Quiz
Electrical Machines Excitation Method GK Quiz. Question and Answers related to Electrical Machines Excitation Method. MCQ (Multiple Choice Questions with answers about Electrical Machines Excitation Method
A series generator, having external characteristics which is a straight line through 0 to 50 V at 200 A is connected as a booster, between a station bus-bar and feeders of 0.5 ohm resistors. The voltage at the far end of feeder at current of 50 A is?
Options
A : 25 V
B : 17 V
C : 8 V
D : 50 V
_____________ is responsible for mechanical power output of a DC motor.
Options
A : Electrical input power
B : Any of the mentioned
C : Air-gap flux
D : Armature emf
The number of parallel paths in the armature is increased by __________
Options
A : increasing number of magnetic poles
B : decreasing number of magnetic poles
C : lap number of magnetic poles
D : using more brushes
The self-excited dc generator with gradual build up of residual voltage and EMF corresponds to __________
Options
A : positive feedback
B : negative feedback
C : saturation
D : any of the mentioned
If a DC shunt generator fails to start, the most primitive action would be __________
Options
A : reversing field connection to armature
B : reversing direction of rotation
C : any of the mentioned applicable ways
D : none of the mentioned
A dc series generator as armature and field connections are reversed, the generator __________
Options
A : stops
B : opposite direction
C : same direction
D : none of the mentioned
Flashing is used to __________
Options
A : temporarily excited field from a battery source for large DC generator
B : temporarily excited field from a battery source for small DC generator
C : temporarily excited field from a battery source for large DC motor
D : temporarily excited field from a battery source for large DC motor
Consider a DC generator running at the rated speed of 2000 rpm, suddenly there is an insulator falls on the field circuit and breaks it. Then __________
Options
A : the motor stops in a few rounds
B : it continues to run but as dc motor
C : it continues to run as a motor
D : none of the mentioned
The critical resistance refers to __________
Options
A : the resistance above which machine does not excite
B : the resistance below which machine does not excite
C : the resistance at which machine does not excite
D : any of the mentioned
If a self excited DC generator is failed to run, this refers to ________________
Options
A : zero residual voltage
B : field MMF, that it is not cumulative
C : resistance is greater than critical resistance
D : any of the mentioned
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