The average value of a cover a complete cycle is:
  • l0
  • \(\frac{l_0}{2}\)
  • \(\frac{l_0}{√2}\)
  • zero
Power factor of an ac circuit is a measure of:
  • virtual power
  • power lost in the circuit
  • mean power
  • all the above
The dimensional formula of L/R is similar to that of:
  • frequency
  • time
  • length
  • none of these
Which of the following has dimensions different from the rest?
  • L/R
  • \(\frac{1}{RC}\)
  • \(\sqrt{LC}\)
  • RC
The dimensional formula of impedance is;
  • [ML2T-2A-2]
  • [ML2T-3A-2]
  • [ML2T-2A-1]
  • [ML2T-2A-3]
Energy dissipates in LCR circuit in :
  • L only
  • C only
  • R only
  • All of the above
An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the
  • 15 V
  • 120 V
  • 180 V
  • 960 V
What is the ratio of inductive and capacitance reactances in an ac circuit?
  • 1
  • ω²L
  • ω²LC
  • l
An acceptor circuit is :
  • series resonant circuit
  • parallel resonant circuit
  • LCR circuit
  • None of these
A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:
  • 10-4 H
  • 10-8 H
  • 10-6 H
  • 10-2 H
In series resonant circuit:
  • reactance is zero
  • current is zero
  • voltage is zero
  • None of these
In parallel resonant circuit:
  • impedance is very high
  • current is very high
  • voltage is very high
  • None of these
The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary isIf 240 V a.c. is applied to primary, the output from the secondary
  • 6 V
  • 12 V
  • 24 V
  • 48 V
Transformer works on the principle of:
  • convertor
  • invertor
  • mutual induction
  • self-induction
Which of the following effects is not shown in alternating current ?
  • Chemical effect
  • Magnetic effect
  • Heating current
  • All of these
An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:
  • 5 A
  • 5√2A
  • \(\frac{5}{√5}\) A
  • zero
The phase difference b/w the A.C. and e.m.f. \(\frac{π}{2}\) Which of the following can not be the instituent of the circuit?
  • LC
  • L alone
  • C alone
  • RL
The Q factor of an LCR circuit at resonance is :
  • \(\sqrt{R^2+ω^2L^2}\)
  • \(\sqrt{R^2+(\frac{1}{cω}})^2\)
  • \(\frac{ω_rL}{R}\)
  • \(\sqrt{R^2+\frac{1}{c^2ω^2}}\)
Faraday constant:
  • depends on the amount of the electrolyte
  • depends on the current in the electrolyte
  • is a universal constant
  • depends on the amount of charge passed through the electrolyte
The natural frequency of an L -C-Circuit is equal to :
  • \(\frac{\sqrt{LC}}{2π}\)
  • \(\frac{1}{3π\sqrt{LC}}\)
  • \(\frac{1}{2π}\sqrt{\frac{L}{C}}\)
  • \(\frac{1}{2π}\sqrt{\frac{C}{L}}\)
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