Electrical Machines Induction Motor Transformer Online Exam Quiz
Electrical Machines Induction Motor Transformer GK Quiz. Question and Answers related to Electrical Machines Induction Motor Transformer. MCQ (Multiple Choice Questions with answers about Electrical Machines Induction Motor Transformer
At no load induction motor has possible power factor as _________
Options
A : 0.2
B : 0.5
C : 0.65
D : 0
The rated current in induction motor for a three phase system is 100A. What can be the no load estimated current for the machine?
Options
A : 12 A
B : 20 A
C : 30 A
D : 5 A
The great advantage of the double squirrel-cage induction motor over single cage rotor is that its _________
Options
A : efficiency is higher
B : power factor is higher
C : slip is larger
D : starting current is lower
An induction motor when started on load, it does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be _________
Options
A : Locking
B : Plumming
C : Crawling
D : Cogging
The no load current of the induction motor is high due to _________
Options
A : long and high reluctance path between stator and rotor
B : mutual flux having moderate reluctance path between stator and rotor
C : leakage flux having low reluctance iron core
D : leakage flux having high reluctance iron core
Mechanically air gaps in induction motor are kept very low to avoid _________
Options
A : lower power factor
B : lagging nature
C : magnetizing current
D : all of the mentioned
The no load current of the transformer is very less due to _________
Options
A : mutual flux having low reluctance iron core
B : mutual flux having high reluctance iron core
C : leakage flux having low reluctance iron core
D : leakage flux having high reluctance iron core
The low no load power factor _________
Options
A : reduces full load operating pf
B : increases full load operating pf
C : reduces full load excitation voltage
D : increases full load excitation voltage
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 _________
Options
A : speed of air gap field w.r.t. stator is Ns-Nr anticlockwise
B : speed of air gap field w.r.t. stator is Ns-Nr clockwise
C : speed of airgap field w.r.t rotor is Ns clockwise
D : speed of airgap field w.r.t. stator is Ns-Nr clockwise
An induction motor can be said analogous to _________
Options
A : transformer
B : synchronous motor
C : universal motor
D : stepper motor
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