Which of the following statements is/are correct regarding the generation of EMF in rotating electrical machines in the armature winding? EMF is generated ____________
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In the equation for RMS value of the generated EMF in a full pitched coil of an AC machine,E = Emax/√2 = √2πfrNΦ, fr depends on
In a short pitched coil, the coil pitch factor kp, is given by ____________
Which of the following equations represents the RMS value of the generated EMF in a short-pitched N-turn armature coil of an AC machine ____________
The effect of short pitched coil on the generated EMF is _____________
A winding is distributed in the slots along the air gap periphery
(i) to add mechanical strength to the winding
(ii) to reduce the amount of conductor material required
(iii) to reduce the harmonics in generated EMF
(iv) to reduce the size of the machine
(v) for full utilization of iron and conductor materials
From these, the correct answer is
In an AC machine, the effect of distributing the turns in different slots, results in a further reduction of generated EMF by the factor kd. This factor is called ____________
A polyphase induction motor of the slip ring or wound rotor type can be used ____________
If the rotor of an induction motor is made to revolve in a direction opposite to the rotating flux wave, then RMS value of EMF induced in one phase of rotor E is proportional to ____________
A 6 pole machine is rotating at a speed of 1200rpm. This speed in mechanical rad/sec and electrical radians per second is respectively
The DC machines are designed with flat topped flux density waves because
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19 videos|90 docs|25 tests
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