Generated EMF

Which of the following statements is/are correct regarding the generation of EMF in rotating electrical machines in the armature winding? EMF is generated ______

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 _________

The EMF generated in an alternator depends upon
(i) speed
(ii) maximum flux per pole
(iii) series turns per phase
(iv) phase spread
(v) coil-span
(vi) type of alternator
Which of the above statements are correct?

The EMF equation e = Nω_rΦsinω_rt is applicable to _______

If the dimensions of all the parts of a synchronous generator and the number of field and armature turns are doubled, then the generated voltage will change by a factor of

The effect of short pitched coil on the generated EMF is _________

The DC machines are designed with flat topped flux density waves because

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 __________

The short pitch winding for an alternator gives
(i) improved wave form of the generated EMF per phase
(ii) reduced value of self inductance of the winding
(iii) increased rating of machine
(iv) reduced tooth ripples
(v) increased total generated EMF
(vi) saving in winding copper
Which of the above statements are correct?

A polyphase induction motor of the slip ring or wound rotor type can be used ____________

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 equation for slip speed is _______

In a short pitched coil, the coil pitch factor k_p, is given by _________

In AC rotating machines, the generated or speed EMF

In an alternator, frequency per revolution is equal to

In the equation for RMS value of the generated EMF in a full pitched coil of an AC machine, E = E_max/√2 = √2πf_rNΦ, f_r depends on

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

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 ________