MCQs of Alternating Current

Alternating Current MCQs

MCQs of Alternating Current

Showing 51 to 60 out of 168 Questions

51.

In an A.C. series circuit of L - R voltage applied is 220 V, if the potential difference across two ends on inductor is 176 V then the potential difference across two ends of the resistance will be _____

(a)	44 V
(b)	110 V
(c)	132 V
(d)	220 V

52.

In series L-C-R circuit, resistance, inductance and capacitance are connected in series. The value of potential difference across three are 70 V, 90 V and 65 V respectively. The value of potential difference of A.C. source is _____

(a)	225 V
(b)	95 V
(c)	85 V
(d)	74.3 V

53.

Which one of the following has the dimension of time ?

(a)	$\frac{C}{R}$
(b)	$\frac{R}{C}$
(c)	CR
(d)	None of these

54.

A capacitor of capacitance 2μF is connected to a tank circuit with frequency of 1kHz, if the current obtained is 2mA, then the voltage across the capacitor will be _____

(a)	0.16 V
(b)	0.32 V
(c)	79.5 V
(d)	159 V

55.

In a L - C oscillator circuit at any instant of time current is I and charge on capacitor is Q then the total energy of the system will be _____

(a)	$\frac{Q^{2}}{2 C}$
(b)	$\frac{Q}{2 C^{2}}$
(c)	$\frac{{Q_{0}}^{2}}{2 C}$
(d)	$\frac{{Q_{0}}^{2}}{2 C^{2}}$

56.

A circuit connected with a source of 230V, draws a current of 2A and power consumed from it is 100 W, then power factor of the circuit is _____

(a)	0.02
(b)	1.2
(c)	0.22
(d)	2.2

57.

A electrical device is connected with an A.C. supply, voltage and current are given by the expression, V = 5cos ωt V and I = 2sin ωt A then the power dissipated in electric device is _____

(a)	0 (zero)
(b)	10 W
(c)	5 W
(d)	215 W

58.

In an A.C. circuit, V and I are given by V = 100 sin (100t) V; I = 100 sin (100t) mA. The power dissipated in the circuit is _____

(a)	10⁴ W
(b)	10 W
(c)	2.5 W
(d)	5 W

59.

The real power in an A.C. circuit containing only capacitor _____

(a)	$\frac{1}{2} {CV}^{2}$
(b)	CV²
(c)	$\frac{1}{4} {CV}^{2}$
(d)	zero

60.

In oscillator circuit, presence of _____ are necessary.

(a)	R and C
(b)	R and L
(c)	C and R
(d)	both C and L

Showing 51 to 60 out of 168 Questions