Alternating Current Test

Result

Alternating Current Test - 83

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Weekly Quiz Competition

Question 1
1 / -0

In an inductor, the current l varies with time t as i=5A+16 (A/s) t. If induced emf in the inductor is 5 mV, the self inductance of the inductor is

A
$$3.75\times 10^{-3}H$$

B
$$3.75\times 10^{-4}H$$

C
$$3.125\times 10^{-3}H$$

D
$$3.125\times 10^{-4}H$$

Solution
Question 2
1 / -0

A magnet is moving towards the coil along the axis and the emf induced tin the coil is 'e' if the coil also starts moving towards the magent with same speed. the induced emf will be

A
$$\frac{e}{2}$$

B
e

C
2e

D
4e
Question 3
1 / -0

For an alternating current of frequency $$\dfrac { 5 }{ \pi } Hz$$ in $$L-C-R$$ series circuit with $$L-1H,C-1{ \mu }{ F }_{ R }-100 { \Omega }$$ impedance is :-

A
$${ 100 }{ \Omega }$$

B
$${ 100 }{\sqrt \pi \Omega }$$

C
$${ 100 }{\sqrt 2\pi \Omega }$$

D
$${ 100 }{ z\Omega }$$

Solution
Question 4
1 / -0

yf the frequency of the source e.m.f. in an AC circuit is $$n$$ , the power varies wath a frequency

A
$$n$$

B
2$$n$$

C
$$n / 2$$

D
zero

Solution
Question 5
1 / -0

For a series LCR circuit at resonance, the statement which is not true:-

A
Peak energy stored by a capacitor $$=$$ peak
energy stored by an inductor

B
Average power $$=$$ apparent power

C
Wattless current is zero

D
Power factor is one
Question 6
1 / -0

The current (i) in the inductance is varying with according to the plot shown in figure.
Which one of the following is the correct variation of voltage with time in the coil?

A

B

C

D
Question 7
1 / -0

A coil of induction $$0.5\ H$$ is connected to a $$18\ V$$ battery. The rate of growth of current in the inductor, just after the switch $$'S'$$ is closed.

A
$$Zero$$

B
$$18\ A/s$$

C
$$36\ A/s$$

D
$$Infinite$$

Solution
Question 8
1 / -0

An alternating source of frequency $$\nu$$ is connected to a series LCR-circuit. The graph that best represents the variation of the current $$I$$ with the frequency of the applied ac is

A

B

C

D

Solution
Question 9
1 / -0

An LCR circuit as shown in the figure is connected to a voltage soruce $$V_{ac}$$ whose frequency one be varied.
The frequency, at which the voltage across the resistor is maximum, is :

A
$$902 Hz$$

B
$$143 Hz$$

C
$$23 Hz$$

D
$$345 Hz$$

Solution
Question 10
1 / -0

As the frequency of an alternating current increases, the impedance of the circuit

A
increase continuously

B
decreases continuously

C
remains constant

D
None of these

Solution