A 3-phase induction motor with its rotor blocked behaves similar to a _________

ISM III YEAR

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Education
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Professional Development
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Hard
PRABHU R
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
transformer under short circuit of secondary terminals
transformer under open circuit of secondary
synchronous motor under slip test
synchronous motor under open circuit
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Mechanically air gaps in induction motor are kept very low to avoid _________
lower power factor
lagging nature
magnetizing current
all of the mentioned
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The rotor of 3-phase slip ring induction motor is fed from a 3-phase supply with its stator winding short circuited having rotor rotating clockwise at a speed of Nr, then the _________
speed of air gap field w.r.t. stator is Ns-Nr anticlockwise
speed of air gap field w.r.t. stator is Ns-Nr clockwise
speed of airgap field w.r.t rotor is Ns clockwise
speed of airgap field w.r.t. stator is Ns-Nr clockwise
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Starters are required in the induction motor because __________
torque produced is very low at starting to overcome inertia
they are not self starting
of high starting current
all of the mentioned
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For the application requiring high starting torque and minimum starting current, the most suitable starting method will be?
Star-Delta method
DOL method
Reactance starting method
Auto transformer starting method
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 3-phase slip ring IM is has its copper bars changed by the aluminium bars in the machine. With the above change ___________
starting torque remains same
starting torque increase
starting torque decrease
maximum torque increase
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________
hysteresis effect
armature reaction
hysteresis effect and armature reaction
eddy currents
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