Question 4
Marks : +2 | -2
Pass Ratio : 100%
What is the use of flip-flop in electronic phase meters?
Explanation: Flip-flop in electronic phase meters are used to produce a rectangular pulse with duration t which is equal to phase difference between signals.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Phase-Sensitive detectors are used for measuring phase of ______________
Explanation: Phase sensitive detectors are used to measure the phase and amplitude of periodic signals. It is done by comparing a signal with a standard reference signal.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following relation is correct for phase angle and reactive power?
Explanation: From the power triangle, using relation for sin function we obtain Reactive power is the product of apparent power and sin of phase angle.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
For what purpose, FET’s are included in phase sensitive detectors?
Explanation: Field effect transistors are included as single-pole, double-throw switches to work with very low frequency signals.