Alternating Current Test

Result

Alternating Current Test - 12

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
1 / -0

A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then

A
Bulb will give more intense light

B
Bulb will give less intense light

C
Bulb will give light of same intensity as before

D
Bulb will stop radiating light

Solution

When a bulb and a capacitor are connected in series to an ac source, then on increasing the frequency the current in the circuit is increased, because the impedance of the circuit is decreased. So the bulb will give more intense light.
Question 2
1 / -0

The power is transmitted from a power house on high voltage ac because

A
Electric current travels faster at higher volts

B
It is more economical due to less power wastage

C
It is difficult to generate power at low voltage

D
Chances of stealing transmission lines are minimized

Solution

Power loss ∝ 1/(Voltage)²
Question 3
1 / -0

The process by which ac is converted into dc is known as

A
Purification

B
Amplification

C
Rectification

D
Current amplification

Solution

The process by which ac is converted into dc is known as Rectification.
Question 4
1 / -0

Assertion: In series LCR circuit resonance can take place.

Reason: Resonance takes place if inductance and capacitive reactance’s are equal and opposite.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion

B
If both assertion and reason are true but reason is not the correct explanation of the assertion

C
If assertion is true but reason is false

D
If the assertion and reason both are false

Solution

At resonant frequency X_L = X_C , so, Z= R (minimum) therefore, current in the circuit is maximum.
Question 5
1 / -0

Choke coil is used to control

A
Ac

B
Dc

C
Both ac and dc

D
Neither ac nor dc

Solution

The choke coil can be used only in ac circuits, not in dc circuits, because for dc (ω = 0) the inductive reactance X_L = ωL of the coil is zero, only the resistance of the coil remains effective which too is almost zero.