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Test: Series Circuits & Parallel Networks


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30 Questions MCQ Test Basic Electrical Technology | Test: Series Circuits & Parallel Networks

Test: Series Circuits & Parallel Networks for Electrical Engineering (EE) 2022 is part of Basic Electrical Technology preparation. The Test: Series Circuits & Parallel Networks questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Series Circuits & Parallel Networks MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Series Circuits & Parallel Networks below.
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Test: Series Circuits & Parallel Networks - Question 1

In a series circuit, which of the parameters remain constant across all circuit elements such as resistor, capacitor and inductor?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 1

In a series circuit, the current across all elements remain the same and the total volt-age of the circuit is the sum of the voltages across all the elements.

Test: Series Circuits & Parallel Networks - Question 2

Voltage across the 60 Ω resistor is ______.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 2
  • The 60 ohm resistance is shorted since current always chooses the low resistance path. So, whole of the current will flow through the alternative route and there will be 0 current through 60Ω resistance.
  • As, Voltage across short circuit is equal to zero, hence voltage across the resistor is 0.
Test: Series Circuits & Parallel Networks - Question 3

Calculate the resistance between A and B.

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Detailed Solution for Test: Series Circuits & Parallel Networks - Question 3

Test: Series Circuits & Parallel Networks - Question 4

 Find the voltage across the 6 ohm resistor.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 4

Total current = 150/(6+12+15) = 4.55A.

V across 6 ohm = Total current x resistance

= 4.55 * 6 = 27.24V.

Test: Series Circuits & Parallel Networks - Question 5

If there are two bulbs connected in series and one blows out, what happens to the other bulb?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 5

Since the two bulbs are connected in series, if the first bulb burns out there is a break in the circuit and hence the second bulb does not glow.

Test: Series Circuits & Parallel Networks - Question 6

 Voltage across a series resistor circuit is proportional to?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 6

V=IR hence voltage across a series resistor circuit is proportional to the value of the resistance because current remains same in series circuit.

Test: Series Circuits & Parallel Networks - Question 7

 Many resistors connected in series will?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 7

In a series circuit, the current remains the same across all resistors hence the voltage divides proportionally among all resistors.

Test: Series Circuits & Parallel Networks - Question 8

 What is the voltage measured across a series short?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 8

A short is just a wire. The potential difference between two points of a wire is zero hence the voltage measured is equal to zero.

Test: Series Circuits & Parallel Networks - Question 9

What happens to the current in the series circuit if the resistance is doubled?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 9

Current is inversely proportional to resistance so resistance increased 2 times means current is decreased 2 times.

Test: Series Circuits & Parallel Networks - Question 10

 If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 10

 In a parallel circuit, if one bulb blows out, it acts as an open circuit. Current does not flow in that branch but it continues to flow in the other branch hence the bulb continues to glow.

Test: Series Circuits & Parallel Networks - Question 11

Calculate the current across the 20 ohm resistor.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 11

Explanation: I=V/R. Since in parallel circuit, voltage is same across all resistors. Hence across the 20 ohm resistor, V=200V so I=200/20=10A.

Test: Series Circuits & Parallel Networks - Question 12

In a parallel circuit, with a number of resistors, the voltage across each resistor is ________

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 12

 In parallel circuits, the current across the circuits vary whereas the voltage remains the same.

Test: Series Circuits & Parallel Networks - Question 13

Which is the most cost efficient connection?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 13

The advantage of series-connections is that they share the supply voltage, hence cheap low voltage appliances may be used.

Test: Series Circuits & Parallel Networks - Question 14

 Calculate the total current in the circuit.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 14
  • The 1 ohm and 2-ohm resistor are in series which is in parallel to the 3-ohm resistor.
  • The equivalent of these resistances is in series with the 4 ohms and 5-ohm resistor.
  • Total R= 10.5 ohm. I=V/R= 120/10.5= 11.42A.
Test: Series Circuits & Parallel Networks - Question 15

The voltage across the open circuit is?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 15

The voltage across all branches in a parallel circuit is the same as that of the source voltage. Hence the voltage across the 10 ohm resistor and the open circuit is the same=100V.

Test: Series Circuits & Parallel Networks - Question 16

The voltage across the short is?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 16

The voltage across a short is always equal to zero whether it is connected in seroes or parallel.

Test: Series Circuits & Parallel Networks - Question 17

If the current through the x ohm resistance in the circuit is 5A, find the value of x.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 17

R=V/I. In this circuit I=5A and V=135V. Therefore, R=135/5=27 ohm.

Test: Series Circuits & Parallel Networks - Question 18

The currents entering in the three branches of a parallel circuit are 3A, 4A and 5A. What is the current leaving it?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 18

The total current leaving a node is the same as the current that enters it. Total I=I1+I2+I3=3+4+5=12A.

Test: Series Circuits & Parallel Networks - Question 19

The total resistance between A and B are?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 19

The resistors are connected in parallel, hence the equivalent resistance= 1/(1/20=1/20+1/20+1/20)=5ohm.

Test: Series Circuits & Parallel Networks - Question 20

 Is it preferable to connect bulbs in series or in parallel?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 20

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

Test: Series Circuits & Parallel Networks - Question 21

 Calculate the total resistance between the points A and B.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 21

1 ohm in parallel with 2 ohm give 2/3 ohm equivalent which is in series with 4 ohm and 3 ohm so total resistance between A and B = 4 + 2/3 + 3 = 23/3 = 7.66 ohm.

Test: Series Circuits & Parallel Networks - Question 22

Calculate the equivalent resistance between A and B.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 22

Test: Series Circuits & Parallel Networks - Question 23

Batteries are generally connected in ______.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 23

Batteries are generally connected in series so that we can obtain the desired voltage since voltages add up once they are connected in series.

Test: Series Circuits & Parallel Networks - Question 24

 In a _________ circuit, the total resistance is greater than the largest resistance in the circuit.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 24

 In series circuits the total resistance is the sum of all the resistance in the circuit, hence the total is greater than the largest resistance.

Test: Series Circuits & Parallel Networks - Question 25

In a ____________ circuit, the total resistance is smaller than the smallest resistance in the circuit.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 25

in a parallel circuit, the equivalent resistance=1/sum of the reciprocals of all the re-sistances in the circuit. Hence it is smaller than the smallest resistance in the circuit.

Test: Series Circuits & Parallel Networks - Question 26

What is the current through R1 and R2 in the following diagram?
Circuit1.JPG

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 26
  • All are In parallel so voltage is same
  • I= 5/5 =1A
  • I2 = 5/3 = 1.667A
Test: Series Circuits & Parallel Networks - Question 27

Calculate the equivalent resistance between A and B.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 27
  • 3 and 2 ohm resistors are in series, So 3+2 = 5ohm
  • 5 and 5 ohm resistors are in parallel. So 5 || 5 = 2.5ohms
  • 2.5 and1.5ohm resistors are in series. So 2.5+1.5 = 4ohms
  • Finally, 4 and 4ohm resistors are in parallel. So 4 || 4 = 2ohms.
    That is resistance across A and B terminals is 2 ohms
Test: Series Circuits & Parallel Networks - Question 28

Calculate the equivalent resistance between A and B.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 28
  • Between Point A and B, R=20||20||20 = 6.67 ohm.
  • The three 20 ohm resistors are in parallel and resistance is measured across this terminal.
  • Net resistance is 6.67ohm.
Test: Series Circuits & Parallel Networks - Question 29

A circuit has a resistor with a resistance of 3Ω followed by three parallel branches, each holding a resistor with a resistance of 5Ω. What is the total equivalent resistance of the circuit?

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 29

Test: Series Circuits & Parallel Networks - Question 30

Calculate the equivalent resistance between A and B.

Detailed Solution for Test: Series Circuits & Parallel Networks - Question 30
  • 5 ohm and 15 ohm are connected in series to give 20 ohm.10ohm and 20 ohm are connected in series to give 30 ohm.
  • Now both equivalent resistances (20ohm and 30 ohm) are in parallel to give equivalent resistance 20*30/(20+30) = 12 ohm.
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