Graph given below shows variation of voltage, current and flux for a magnetisation-demagnetisation cycle for an inductor. One of the correct conclusion out of the graph below can be:

 

 

 

 

  • Voltage leads current

  • Current leads voltage

  • Voltage and current are in phase

  • Sometimes current leads sometimes voltage leads

Phasor diagram given below represents which circuit?

 

 

  • Purely capacitive circuit

  • Purely inductive circuit

  • Purely resistive circuit

  • RC circuit

Graph given below shows variation of voltage, current and charge for a charging-discharging cycle for a capacitor. Then -

 

 

  • Voltage leads current

  • Current leads voltage

  • Voltage and current are in phase

  • Sometimes current leads sometimes voltage leads

The phasor diagram given below represents a series LCR  circuit. The circuit is predominantly-

 

 

 

 

  • Capacitive

  • Inductive

  • Resistive

  • All of the above

In the phasor diagram given below,  phase difference between current and voltage, ϕ≠π2. Then the circuit is-

 

  • Purely capacitive circuit

  • Purely inductive circuit

  • Purely resistive circuit

  • LCR circuit

Figure shows the variation of peak current im with angular frequency ω for a LCR series circuit for different values of resistor R. Then the resonant frequency is-

  •  1×1062π

  •  2×1062π

  •  3×1062π

  •  4×1062π

The graph given below shows the variation of voltage and current with phase for an AC circuit. The circuit is:

 

 

  • Purely capacitive circuit

  • Purely inductive circuit

  • Purely resistive circuit

  • RC circuit

Graph given below shows variation of voltage and current with phase for an AC circuit. Then the circuit is predominantly-

 

 

 

 

  • Capacitive

  • Inductive

  • Resistive

  • All of the above

Graph given below shows variation of voltage and current with phase for an AC circuit. What is the phase difference between current(i) and voltage(v)?

 

 

 

  • 0

  •  π6

  •  π4

  •  π2

Phasor diagram given below represents which circuit?

 

  • Purely capacitive circuit

  • Purely inductive circuit

  • Purely resistive circuit

  • RC circuit

An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of potential difference 'V' volts as shown in fig. 

Potential difference across L, C and R is 40 V, 10 V and 40V, respectively. The amplitude of the current flowing through LCR series circuit is 102A. The impedance of the circuit:

  •  4 Ω

  •   5 Ω

  •  42 Ω

  •  5/2 Ω

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

  • 2 A

  • 4 A

  • 0.2 A

  • 0.4 A

A series LCR circuit containing 5.0 H inductor, 80 μF capacitor and 40 Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:

  • 46 rad/s and 54 rad/s

  • 42 rad/s and 58 rad/s

  • 25 rad/s and 75 rad/s

  • 50 rad/s and 25 rad/s

A resistor of resistance 100 \(\Omega\) is connected to an AC source E = (12V) sin (250 \(\pi\) s-1)t. The energy dissipated as heat during t = 0 to t = 1.0 ms is:
  • 2.64×10-4 J
  •  2.64×10-2 J
  •  4.84×10-4 J
  •  4.84×10-2 J
0:0:1


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