Q.1
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
  • Both waves must have same frequency
  • Both waves must have identical peak values
  • Both waves must have zero value at the same time
  • None of the above
Q.2
Capacitive reactance is more when
  • Capacitance is less and frequency of supply is less
  • Capacitance is less and frequency of supply is more
  • Capacitance is more and frequency of supply is less
  • Capacitance is more and frequency of supply is more
Q.3
Time constant of a capacitive circuit
  • Increases with the decrease of capacitance and decrease of resistance
  • Increases with the decrease of capacitance and increase of resistance
  • Increases with the increase of capacitance and decrease of resistance
  • Increase with increase of capacitance and increase of resistance
Q.4
A pure capacitor connected across an A.C. voltage consumedW. This is due to
  • The capacitive reactance in ohms
  • The current flowing in capacitor
  • The size of the capacitor being quite big
  • The statement is incorrect
Q.5
In a parallel R-C circuit, the current always _________the applied voltage
  • Lags
  • Leads
  • Remains in phase with
  • None of the above
Q.6
Skin effect occurs when a conductor carries current at _________ frequencies.
  • Very low
  • Low
  • Medium
  • High
Q.7
In a pure capacitive circuit if the supply frequency is reduced to 1/the current will
  • Be reduced by half
  • Be doubled
  • Be four times at high
  • Be reduced to one fourth
Q.8
All the rules and laws of D.C. circuit also apply to A.C. circuit containing
  • Capacitance only
  • Inductance only
  • Resistance only
  • All above
Q.9
The equation ofHz current sine wave having r.m.s. value ofA is
  • 60 sin 25 t
  • 60 sin 50 t
  • 84.84 sin 3141
  • 42.42 sin 314 t
0 h : 0 m : 1 s