Miscellaneous

Question 1

What kind of instruments are used for measuring ac

Answer 1

Hot wire instruments

Question 2

What is a phasor diagram

Answer 2

Diagram representing ac voltage or current as vectors with phase angle between them (ø)
I = I’sin(wt)
V = v’sin(wt + ø)

Question 3

Average value of square of sin or cosine function for one time period

Answer 3

1/2

Question 4

What is average power consumption in terms of Irms, Vrms and Phase

Answer 4

Pavg = Vrms*Irmscosø

Question 5

What is XofL or Xofc

Answer 5

Inductive or capacitive reactance

Question 6

XofL = ? In terms of w

Answer 6

XofL = wL

Question 7

Xofc = ? In terms of c and w

Answer 7

Xofc = Xc = 1/cw