Electrical Machines Dc Machine Torque Online Exam Quiz
Electrical Machines Dc Machine Torque GK Quiz. Question and Answers related to Electrical Machines Dc Machine Torque. MCQ (Multiple Choice Questions with answers about Electrical Machines Dc Machine Torque
The torque induced beyond the pole shoes in the DC machine is?
Options
A : 0
B : 2/pi *phi *i
C : 4/pi *phi *i
D : none of the mentioned
For a universal motor, the rated supply current is 10A giving a rated torque of 100 N-m. If a current of 5A is applied, what will be generated torque vary to?
Options
A : 250 N-m
B : 400 N-m
C : 500 N-m
D : 1000 N-m
Pulsating torque frequency in universal motor is ________
Options
A : 2f
B : f
C : f/2
D : 4f
The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What will be the magnitude of the following current at t=0+?
Options
A : 400A
B : 200A
C : 0
D : any of the mentioned
The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What is the steady state angular velocity at no-load?
Options
A : 480 rad/s
B : 960 rad/s
C : 320 rad/s
D : 490 rad/s
If the torque induced is zero in the dc machine, it can be said that ____________
Options
A : current is zero
B : flux can be zero
C : current or flux=0
D : any of the mentioned
The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?
Options
A : Current will flow but zero induced EMF
B : Current will not flow and zero induced EMF
C : Current will not flow but EMF is induced
D : Current will flow and EMF will also be induced
The velocity of the dc machine at the final state is ________
Options
A : E/Bl
B : Bl/E
C : EBl
D : None of the mentioned
If the torque is in the direction of rotation, the DC machine acts as ________
Options
A : generator
B : motor
C : amplidyne
D : any of the mentioned
DC Motor torque depends on ________
Options
A : geometry
B : magnetic properties
C : any of the mentioned
D : both geometry and magnetic properties of the structure
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