Alternating Current Test

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Alternating Current Test - 1

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Question 1
1 / -0

Average power supplied to an inductor over one complete cycle

A
is always positive

B
is 1

C
is always negative

D
is zero

Solution

Explanation:

In the first half of the cycle, power is supplied to the inductive circuit. In the next half the inductor dissipates the energy supplied by circuit.

Thus overall no power is supplied to the circuit
Question 2
1 / -0

Phasor diagrams show

A
the angular speed

B
phasors(vectors) rotating counterclockwise with constant angular speed

C
phase only

D
phases of matter

Solution

Explanation:

By convention phasor diagrams are made to show the rotation of phasor in counterclockwise direction with constant speed
Question 3
1 / -0

In a circuit containing Resistance only, voltage and current are

A
In phase

B
Out of phase by 120∘

C
Out of phase by 180∘

D
Out of phase by 90∘

Solution

Explanation:

The electrical current that flows through an AC resistance varies sinusoidally with time and is represented by the expression, I(t) = I sin(ωt + θ)

Now by ohm's law, V= IR

So, for the AC circuit, V= IR sin(ωt + θ)

Clearly both V and I have zero phase difference and hen are in phase
Question 4
1 / -0

Alternating current is so called because

A
Voltage alternates between 10 V and 15 V

B
Current is switched on and off alternately

C
Polarity alternates from + to – and – to + with time

D
Voltage alternates between 0 V and 5 V

Solution

Explanation:

Alternating Current is the current in which the polarity of source continuously changes on a fixed frequency. So the positive and the negative terminals ‘alternate’
Question 5
1 / -0

The main reason for preferring usage of AC voltage over DC voltage

A
There are no DC generators

B
DC uses alternators whereas AC uses generators

C
DC Batteries are of low voltage

D
AC voltages can be easily and efficiently converted from one voltage to the other by means of transformers

Solution

Explanation:

By using the phenomenon of mutual induction, transformers allow us to easily change voltage of AC. This is necessary to cut down poer losses while supplying electricity to our homes
Question 6
1 / -0

Domestic power supply in India is

A
220 V, 50 Hz

B
416 V, 60 Hz

C
110 V, 60 Hz

D
24 V D.C

Solution

Explanation:

The standard voltage and frequency of alternating current supply in India is set to 220 V and 50Hz respectively by the government of India because

when power has to be transmitted from a power plant, the biggest challenge is to cut the transmission losses. For this purpose, the current value should be small and potential difference(Voltage) should be more. Also losses are minimal at 50 Hz/60 Hz frequency.

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Alternating Current Test - 1

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Question 1

is always positive

is 1

is always negative

is zero

Solution

Question 2

the angular speed

phasors(vectors) rotating counterclockwise with constant angular speed

phase only

phases of matter

Solution

Question 3

In phase

Out of phase by 120∘

Out of phase by 180∘

Out of phase by 90∘

Solution

Question 4

Voltage alternates between 10 V and 15 V

Current is switched on and off alternately

Polarity alternates from + to – and – to + with time

Voltage alternates between 0 V and 5 V

Solution

Question 5

There are no DC generators

DC uses alternators whereas AC uses generators

DC Batteries are of low voltage

AC voltages can be easily and efficiently converted from one voltage to the other by means of transformers

Solution

Question 6

220 V, 50 Hz

416 V, 60 Hz

110 V, 60 Hz

24 V D.C

Solution

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