In star/delta starting of a 3-phase induction motor, the starting volt – McqOptions

MCQOPTIONS

1.	In star/delta starting of a 3-phase induction motor, the starting voltage is reduced to:
A.	3 times the normal voltage
B.	\(\frac{1}{3}\) times of normal voltage
C.	\(\frac{1}{{\sqrt 3 }}\) of normal voltage
D.	\(\sqrt 3 \) times of normal voltage
Answer» D. \(\sqrt 3 \) times of normal voltage

Discussion

No Comment Found

Related MCQs

A slip-ring induction motor is expected to be started by adding extra resistance in the rotor circuit. The benefit that is derived by adding extra resistance in the rotor circuit in comparison to the rotor being shorted is
In a constant \(V/f\) induction motor drive, the slip at the maximum torque
A 6 – pole, 50 Hz, 3-phase induction motor is running at 950 rpm and has rotor copper loss of 5 kW. It rotor input is:
A three-phase induction motor is running at 4% slip. If the input to the rotor is 1,000 W, then the mechanical power developed by the motor will be _______.
A 3-phase induction motor has a starting torque of 200 N-m when switched on-directly to supply. If an auto-transformer with 50% tapping is used for starting, the starting torque would be
Full load current of an Induction motor is 20 Ampere. The no-load current may be expected to be
A 3-phase, 4 pole, 400 V, 50 Hz, squirrel-cage induction motor is operating at a slip of 0.02. The speed of the rotor flux in mechanical rad/sec sensed by stationary observer, is closest to
Generally, Crawling in squirrel cage induction motors is the tendency to run stably at speeds as low as
For a 3-phase induction motor, what fraction/multiple of supply voltage is required for a direct-on-line starting method such that starting current is limited to 5 times the full-load current and motor develops 1.5 times full-load torque at starting time?
In star/delta starting of a 3-phase induction motor, the starting voltage is reduced to: