If F1 is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3 .), the harmonic MMF wave is of _____________

Varying amplitude and rotates along F1

Constant amplitude and stationary in space

Constant amplitude and rotates along F1

Varying amplitude and rotates along F1

Constant amplitude and rotates against F1

Which of the following statements are correct regarding individual phase MMF in rotating machines?

It is not a rotating MMF wave and its amplitude doesn t alternate along its own phase axis

It is not a rotating MMF wave but its amplitude merely pulsates

Explore topic-wise MCQs in Electrical Machines.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.	If F₁ is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3 .), the harmonic MMF wave is of _____________
A.	Constant amplitude and stationary in space
B.	Constant amplitude and rotates along F<sub>1</sub>
C.	Varying amplitude and rotates along F<sub>1</sub>
D.	Constant amplitude and rotates against F<sub>1</sub>
Answer» C. Varying amplitude and rotates along F<sub>1</sub>

Discussion

2.	The amplitude of rotating MMF wave is proportional to ___________
A.	N<sub>ph</sub> and P
B.	I and P
C.	N<sub>ph</sub> and I
D.	N<sub>ph</sub>, I and P
Answer» D. N<sub>ph</sub>, I and P

Discussion

3.	The magnitude of rotating flux _____________ at all instants of time.
A.	Changes
B.	Remains constant
C.	Pulsates
D.	Any of the mentioned
Answer» C. Pulsates

Discussion

4.	Which of the following statements are correct regarding individual phase MMF in rotating machines?
A.	It is a rotating MMF wave
B.	It is not a rotating MMF wave and its amplitude doesn t alternate along its own phase axis
C.	It is not a rotating MMF wave but its amplitude merely pulsates
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

5.	If the phase sequence of supply currents are reversed, then the direction of rotation of the resultant MMF wave will ___________
A.	Be reversed
B.	Remains unchanged
C.	Cannot be determined
D.	None of the mentioned
Answer» B. Remains unchanged

Discussion

6.	What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where F_m is maximum MMF in any one phase, when current is maximum in that phase.)
A.	(2/m)F<sub>m</sub>
B.	mF<sub>m</sub>
C.	(m/2)F<sub>m</sub>
D.	F<sub>m</sub>
Answer» D. F<sub>m</sub>

Discussion

7.	The speed at which rotating magnetic field revolves is called?
A.	Induction speed
B.	Synchronous speed
C.	Relative speed
D.	Rotating speed
Answer» C. Relative speed

Discussion

Explore topic-wise MCQs in Electrical Machines.

If F1 is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3 .), the harmonic MMF wave is of _____________

The amplitude of rotating MMF wave is proportional to ___________

The magnitude of rotating flux _____________ at all instants of time.

Which of the following statements are correct regarding individual phase MMF in rotating machines?

If the phase sequence of supply currents are reversed, then the direction of rotation of the resultant MMF wave will ___________

What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where Fm is maximum MMF in any one phase, when current is maximum in that phase.)

The speed at which rotating magnetic field revolves is called?

If F₁ is the constant amplitude of fundamental rotating MMF wave, the space harmonics of order 6K+1 (where K=1,2,3 .), the harmonic MMF wave is of _____________

What is the amplitude of rotating MMF produced as a result of m-phase currents flowing in m-phase windings? (where F_m is maximum MMF in any one phase, when current is maximum in that phase.)