Firing angle is time in electrical degrees from the instant the valve voltage is positive to the application of firing pulse to the valve (start of conduction). Also called delay angle.

Description : What is meant by firing angle of thyristor?

Answer : The point at which SCR is triggered is known as firings angle of thyristor.

Description : Define: i) Firing angle ii) Conduction angle

Answer : (i) Conduction Angle (β): Conduction angle is defined as the angle between the instant the SCR is triggered or turned on and the instant at which the SCR is turned off. Assuming that the SCR ... maximum average output voltage to the angle when the SCR is actually triggered or fired by gate pulse.

Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

Description : What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?

Answer : 90° will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value.

Description : What is the maximum value of torque angle in synchronous motor?

Answer : The maximum value of torque angle in synchronous motor is 90 degrees electrical.