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Test: Different of Circuit - Electrical Engineering (EE) MCQ


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30 Questions MCQ Test - Test: Different of Circuit

Test: Different of Circuit for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Different of Circuit questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Different of Circuit MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Different of Circuit below.
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Test: Different of Circuit - Question 1

The instantaneous voltage is a product of the resistance and the _____________ current in a resistive circuit.

Detailed Solution for Test: Different of Circuit - Question 1

The instantaneous voltage is a product of the instantaneous current and the resistance in the circuit.

Test: Different of Circuit - Question 2

Find the value of the instantaneous voltage if the resistance is 2 ohm and the instantaneous current in the circuit is 5A.

Detailed Solution for Test: Different of Circuit - Question 2

We know that,
v=iR, substituting the given values from the question, we get v=10V.

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Test: Different of Circuit - Question 3

The power for a purely resistive circuit is zero when?

Detailed Solution for Test: Different of Circuit - Question 3

The power in a resistive circuit is the product of the voltage, current and the cosine of the phase angle. Hence if either voltage or current is zero, the power is zero.

Test: Different of Circuit - Question 4

If the maximum voltage in the circuit is 10V and the resistance is 5 ohm, calculate the maximum current in the circuit.

Detailed Solution for Test: Different of Circuit - Question 4

We know that:
Im=Vm/R
Substituting the given values from the question, we get Im=2A.

Test: Different of Circuit - Question 5

Calculate the resistance in the circuit if the rms voltage is 20V and the rms current is 2A.

Detailed Solution for Test: Different of Circuit - Question 5

We know that:
R=V/I
Substituting the given values from the question, we get R=10 ohm.

Test: Different of Circuit - Question 6

 The power for a purely resistive circuit is zero when?

Detailed Solution for Test: Different of Circuit - Question 6

P=VIcosϕ Power in a circuit is the product of voltage, current and the cosine of the phase angle. Phase angle is 00 for purely resistive circuit so, P=VI. Hence if either voltage or current is zero, the power is zero.

Test: Different of Circuit - Question 7

Can ohm’s law be applied in an ac circuit?

Detailed Solution for Test: Different of Circuit - Question 7

 Ohm’s law can be applied in ac as well as dc circuits. It can be applied in ac circuits because the condition V=IR holds true even in ac circuits.

Test: Different of Circuit - Question 8

 What is the current found by finding the current in n equidistant regions and dividing by n?

Detailed Solution for Test: Different of Circuit - Question 8

The average value of current is the sum of all the currents divided by the number of currents.

Test: Different of Circuit - Question 9

 What is the effective value of current?

Detailed Solution for Test: Different of Circuit - Question 9

Effective current is also known as the effective current. RMS stands for Root Mean Square. This value of current is obtained by squaring all the current values, finding the average and then finding the square root.

Test: Different of Circuit - Question 10

Find the average value of current when the current that are equidistant are 4A, 5A and 6A.

Detailed Solution for Test: Different of Circuit - Question 10

The average value of current is the sum of all the currents divided by the number of currents. Therefore average current= (5+4+6)/3=5A.

Test: Different of Circuit - Question 11

 In case of Inductive circuit, Frequency is ______________ to the inductance.

Detailed Solution for Test: Different of Circuit - Question 11

The formula for frequency in an inductive circuit is:
XL=2*pi*f*L.
Therefore: L is inversly proportional to f.

Test: Different of Circuit - Question 12

If the current and voltage are 90 degree out of phase, the power factor will be?

Detailed Solution for Test: Different of Circuit - Question 12

The power factor is the cosine of the angle in between the voltage and the current. If the angle between the voltage and current is 90, then cos90=0. Hence, the power factor is zero.

Test: Different of Circuit - Question 13

If the power factor is 1/10 and the value of impedance is 20 ohm, calculate the resistance in the circuit.

Detailed Solution for Test: Different of Circuit - Question 13

We know that:
cos(ϕ) = R/Z
R = Z cos(ϕ) = 20/10 = 2 ohm.

Test: Different of Circuit - Question 14

What is the unit for inductive reactance?

Detailed Solution for Test: Different of Circuit - Question 14

Inductive reactance is nothing but the impedance. Impedance is the AC equivalent of resistance, hence the unit for inductive reactance is ohm.

Test: Different of Circuit - Question 15

If the current in a coil having a constant inductance of L henrys grows at a uniform rate, what is the value of the average current?

Detailed Solution for Test: Different of Circuit - Question 15

The average current is the average of the current which flows in the inductor. Hence it is I/2.

Test: Different of Circuit - Question 16

  It is preferable to connect bulbs in series or in parallel?

Detailed Solution for Test: Different of Circuit - Question 16

Bulbs are connected in parallel so that even if one of the bulbs blow out, the others continue to get a current supply.

Test: Different of Circuit - Question 17

Calculate the emf induced in an inductor if the inductance is 10H and the current is 2A in 4s.

Detailed Solution for Test: Different of Circuit - Question 17

The expression for emf in an inductive circuit is:
emf= LI/t
Substituting the values from the given question, we get emf= 5V.

Test: Different of Circuit - Question 18

 Calculate the current in an inductor if the energy stored is 160J and the inductance is 20H.

Detailed Solution for Test: Different of Circuit - Question 18

The expression for energy in an inductor is:
W= LI2/2
Substituting the values from the given question, we get I=4A.

Test: Different of Circuit - Question 19

Find the time taken for the current in an inductor to change to 2A from 0A if the power in the inductor is 5W. The value of inductance is 10H.

Detailed Solution for Test: Different of Circuit - Question 19

The expression for power in an inductive circuit is:
P= LI2/2
Substituting the values from the given question, we get t=4s.

Test: Different of Circuit - Question 20

An induced emf is said to be?

Detailed Solution for Test: Different of Circuit - Question 20

Any circuit in which a change of current is accompanied by a change of flux, and therefore by an induced emf, is said to be inductive.

Test: Different of Circuit - Question 21

 What is the relation between current and voltage in a capacitor?

Detailed Solution for Test: Different of Circuit - Question 21

Current=rate of change of charge=> I=dQ/dt. Q=CV, hence I=CdQ/dt.

Test: Different of Circuit - Question 22

Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds.

Detailed Solution for Test: Different of Circuit - Question 22

 Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance. Hence Q=CV.
Q=3*2=6C.
I=Q/t= 6/2=3A.

Test: Different of Circuit - Question 23

 If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor.

Detailed Solution for Test: Different of Circuit - Question 23

Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance. Hence Q=CV.
Q=3*2=6C.

Test: Different of Circuit - Question 24

 Which among the following expressions relate charge, voltage and capacitance of a capacitor?

Detailed Solution for Test: Different of Circuit - Question 24

Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance. Hence Q=CV.

Test: Different of Circuit - Question 25

What happens to the current flow in a fully charged capacitor?

Detailed Solution for Test: Different of Circuit - Question 25

When a capacitor is fully charged, it does not store any more charge. There is no change in charge with time. Current is the rate of change of charge, hence it becomes zero, or stops.

Test: Different of Circuit - Question 26

For high frequencies of alternating current, capacitor acts as?

Detailed Solution for Test: Different of Circuit - Question 26

Capacitive impedance is inversely proportional to frequency. Hence at very high frequencies, the impedance is almost equal to zero, hence it acts as a short circuit and there is no voltage across it.

Test: Different of Circuit - Question 27

For very low frequencies of alternating current, capacitor acts as?

Detailed Solution for Test: Different of Circuit - Question 27

Capacitive impedance is inversely proportional to frequency. Hence at very low frequencies the impedance is almost infinity and hence acts as an open circuit and no current flows through it.

Test: Different of Circuit - Question 28

 Capacitor preferred when there is high alternating current frequency in the circuits is?

Detailed Solution for Test: Different of Circuit - Question 28

Mica capacitors are preferred for high frequency circuits because they have low ohmic losses and less reactance.

Test: Different of Circuit - Question 29

 If a 2F capacitor has 1C charge, calculate the voltage across its terminals.

Detailed Solution for Test: Different of Circuit - Question 29

Q is directly proportional to V. The constant of proportionality in this case is C, that is, the capacitance.

Hence Q = CV.

V = Q/C = 1/2

V = 0.5V.

Test: Different of Circuit - Question 30

What is the voltage across a capacitor at the time of switching, that is, when t=0?

Detailed Solution for Test: Different of Circuit - Question 30

At the time of switching, when t=0, the capacitor acts as a short circuit. The voltage across a short is always equal to zero hence the voltage across the capacitor is equal to zero.

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