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Electrical Engineering
3 Phase Induction Motors
Quiz 3
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Q.1
A 3-phase slip ring motor has
double cage rotor
wound rotor
short-circuited rotor
any of the above
Q.2
The starting torque of a 3-phase squirrel cage induction motor is
twice the full load torque
1.5 times the full load torque
equal to full load torque
All of above
Q.3
Short-circuit test on an induction motor cannot be used to determine
windage losses
copper losses
transformation ratio
power scale of circle diagram
Q.4
In a three-phase induction motor
iron losses in stator will be negligible as compared to that in rotor
iron losses in motor will be neg¬ligible as compared to that in rotor
iron losses in stator will be less than that in rotor
iron losses in stator will be more than that in rotor
Q.5
The torque of a rotor in an induction motor under running condition is maximum
at the unit value of slip
at the zero value of slip
at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
at the value of the slip which makes the rotor reactance half of the rotor
Q.6
In the squirrel-cage induction motor the rotor slots are usually given slight skew
to reduce the magnetic hum and locking tendency of the rotor
to increase the tensile strength of the rotor bars
to ensure easy fabrication
none of the above
Q.7
In three-phase induction motors sometimes copper bars are placed deep in the rotorto
improve starting torque
reduce copper losses
improve efficiency
improve power factor
Q.8
The complete circle diagram of induetion motor can be drawn with the help of datafound from
noload test
blocked rotor test
stator resistance test
all of the above
Q.9
The shape of the torque/slip curve of induction motor is
parabola
hyperbola
rectangular parabola
straigth line
Q.10
A change ofof supply voltage to an induction motor will produce a change ofappromimately
4% in the rotor torque
8% in the rotor torque
12% in the rotor torque
16% in the rotor torque
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