for given no. of poles and if supply frequency reduces, sychronous spe – McqOptions

MCQOPTIONS

1.	for given no. of poles and if supply frequency reduces, sychronous speed of rotating magnetic field
A.	remains same
B.	decreases
C.	increases
D.	decreases to half value
Answer» C. increases

Discussion

No Comment Found

Related MCQs

A 3 phase induction motor is running with full load slip of 1.2% and its rotor impedance per phase is 0.06+j0.265Ω then ratio of starting torque to maximum torque is
For 3phase I.M,the synchronous speed of rotating magnetic field is 750 rpm, slip is 2.5% ,speed of rotor is----------
The conditions of induction motor at no load resembles those of transformer whose secondary is……
A 6pole ,3 phase 50Hz I.M is running with 970 rpm. The slip of I.M is
The torque equation of a dc motor is --
A 3 phase I.M. is running with full load slip of 1.2% and its rotor impedance per phase on standstill is 0.016+j0.265Ω then ratio of full load torque to starting torque is _____.
A 250V DC shunt motor takes a total current of 20A. Resistance of shunt field winding is 200Ω and that of armature is 0.3Ω . What is the current in the armature?
The magnitude of induced emf in a dc generator is given by
A 3-phase, 4-pole induction motor has a no-load slip of 2% when connnected to a 25 Hz source, the no-load speed in rpm is
A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the full load speed of the motor?