UPPCL EE Technical Quiz 3

The neutral of the 3 phase 20 MVA, 11 kV alternator is earthed through a resistance of 50 Ohms, the relay is set to operate when there is an out of balance current of 1.5 A . The CTs have a ratio of 100/5. What should be the minimum value of the earthing resistance to protect 90% of winding?

Starting current of 3-ϕ induction motor is 5 times the rated current, while the rated slip is 4%. The ratio of starting torque to full load torque is

Which one of the following is a valid value of the coefficient of coupling between two inductors?

In a power factor meter, the controlling torque is

What is the total power radiated by the antenna, if 1 mW of power is fed to loss less antenna with a directive gain of +6 dB.

Standardization of potentiometer is done in order that, they become

The signal phase reluctance machine acts as a generator when angle δ is__

Hysteresis loss and eddy current loss are used in ?

A series circuit consists of R = 20 Ω, L = 20 mH and an A.C. supply of 60 V with f = 100 Hz. So, the current in R is

At the resonance frequency of parallel RLC circuit, the admittance of a series resonant circuit is