Which one of the following options is correct regarding the typical double-squirrel-cage structure used in induction motors?

Consider the table given:

The correct combination that relates the constructional feature, machine type and mitigation is

A 3-phase, 4-pole, 400 V, 50 Hz squirrel-cage induction motor is operating at a slip of 0.02. The speed of the rotor flux in mechanical rad/sec, sensed by a stationary observer, is closest to

Leakage flux in an induction motor is  

A 220V, 50 Hz, single-phase induction motor has the following connection diagram and winding orientations shown. MM’ is the axis of the main stator winding  and AA' is that of the auxiliary winding . Directions of the winding axes indicate direction of .flux when currents in the windings are in the directions shown. Parameters of each winding are indicated.  When switch S is closed, the motor.

A 230V. 50 Hz, 4-pole, single-phase induction motor is rotating in the clockwise (forward) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8Ω, then the effective rotor resistance in the backward branch of the equivalent circuit will be

For a single phase capacitor start induction motor which of the following statements is valid?

The direction of rotation of a 3-phase induction motor is clockwise when it is supplied with 3-phase sinusoidal voltage having phase sequence A-B-C. For counter clockwise rotation of the motor, the phase sequence of the power supply should be 

Following are some of the properties of rotating electrical machines                

P        Stator winding current is dc, rotor-winding current is ac

Q         Stator winding current is ac, rotor-winding current is dc

R         Stator winding current is ac, rotor-winding current is ac

S         Stator has salient poles and rotor has         commutator

T         Rotor has salient poles and slip rings and stator is         cylindrical

U         Both stator and rotor have poly-phase windings

DC machines, Synchronous machines and Induction machines exhibit some of the above properties as given in the following table. Indicate the correct combination from this table

The rotor of a three phase, 5 kW, 400V, 50 Hz, slip ring induction motor is wound for 6 poles while its stator is wound for 4 poles. The approximate average no load steady state speed when this motor is connected to 400V, 50 Hz supply is

A 3-phase, 4-pole squirrel cage induction motor has 36 stator and 28 rotor slots. The number of phases in the rotor is:

Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting

In case of a split phase motor, the phase shift between currents in the two windings is around

In an induction motor, if the air gap is increased

Skew is used in induction motors in order to reduce torque due to