Alternating Current Test

Result

Alternating Current Test - 59

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A
0.6, 0.06 W

B
0.06, 0.6 W

C
0.6, 4.8 W

D
4.8, 0.6 W

Solution
Question 2
4 / -1

The self inductance of a choke coil is 10 mH. When it is connected with a 10 V dc source, then the loss of power is 20 watt. When it is connected with 10 volt ac source loss of power is 10 watt. The frequency of ac source will be

A
50 Hz

B
60 Hz

C
80 Hz

D
100 Hz

Solution
Question 3
4 / -1

In an LCR circuit R = 100 ohm. when capacitance C is removed, the current lags behind the voltage by π/3. When inductance L is removed, the current leads the voltage by π/3. The impedance of the circuit is

A
50 ohm

B
100 ohm

C
200 ohm

D
400 ohm

Solution
Question 4
4 / -1

A group of electric lamps having a total power rating of 1000 watt is supplied by an ac voltage E = 200 sin(310t + 60° ). Then the r.m.s. value o the circuit current is

A
10A

B
10√2 A

C
20 A

D
20√2 A

Solution
Question 5
4 / -1

Following figure shows an ac generator connected to a \"block box\" through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us. Measurements outside the box reveals that
e = 75 sin (sin ωt) volts,
i = 1.5 sin (ωt + 45° )
amp. The wrong statement is

A
There must be a capacitor in the box

B
There must be an inductor in the box

C
There must be a resistance in the box

D
The power factor is 0.707
Question 6
4 / -1

A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency is n_r, then the current lags behind voltage, when

A
n = 0

B
n r

C
n = n_r

D
n >n_r

Solution
Question 7
4 / -1

The instantaneous values of current and voltage in an ac circuit are i = 100 sin 314 t amp and e = 200 sin (314 t + π/3) V respectively. If the resistance is 1 Ω, then the reactance of the circuit will be

A

B

C

D

Solution
Question 8
4 / -1

What will be the self inductance of a coil, to be connected in a series with a resistance of π√3 Ω, such that the phase difference between the e.m.f. and the current at 50 Hz frequency is 30°

A
0.5 henry

B
0.03 henry

C
0.05 henry

D
0.01 henry

Solution
Question 9
4 / -1

The phase difference between the voltage and the current in an ac circuit is π/4. If the frequency is 50 Hz then this phase difference will be equivalent to a time of

A
0.02 s

B
0.25 s

C
2.5 ms

D
25 ms

Solution
Question 10
4 / -1

A
–π/6 rad

B
– π/3 rad

C
π/6 rad

D
π/3 rad

Solution