Electrical Machines Questions and Answers – Synchronous Machines
MMF Produced by Distributed Windings
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The armature MMF wave in a DC machine is ______
Correct!
Wrong!

In a DC machine, z,p,I_{a} and a are respectively the number of conductors, number of poles, armature current and number of parallel paths. The peak value of fundamental component of armature MMF wave is _________
Correct!
Wrong!

A knowledge of the air gap flux distribution in a machine helps in determining the
Correct!
Wrong!

If the current in the coil is DC, then MMF doesn’t vary with ________
Correct!
Wrong!

Which of the following statements are correct regarding the current sheet?
Correct!
Wrong!

A current sheet with sinusoidal current produces?
Correct!
Wrong!

If the current in a coil is AC, the amplitude of MMF
Correct!
Wrong!

The winding MMF in rotating machines depends on
Correct!
Wrong!

A uniformly distributed winding on the stator has three full pitched coils, each coil having N turns and each turn carrying a current i. The MMF produced by the winding is
Correct!
Wrong!

Peak value of fundamental component of MMF produced by one Nturn coil carrying a current ‘i’ is ___________
Correct!
Wrong!

MMF produced by one Nturn coil carrying a current i is _______
Correct!
Wrong!

The armature MMF wave in a DC machine is triangluar and
(i) rotates with respect to stator
(ii) is stationary with respect to stator
(iii) rotates with respect to armature
(iv) is stationary with respect to armature
Which of the above statements are correct?
(i) rotates with respect to stator
(ii) is stationary with respect to stator
(iii) rotates with respect to armature
(iv) is stationary with respect to armature
Which of the above statements are correct?
Correct!
Wrong!

A sinusoidal current sheet in a rotating electrical machine has peak value along qaxis. The peak value of sinusoidal MMF would be
Correct!
Wrong!

A winding of 20 full pitched series turns, distributed over a band of 60° under each pole, carries a current of 3A. The winding produces a uniform current sheet of density (in AT’s per electrical radiangs) of
Correct!
Wrong!
