EEE - Series Circuits Quiz (or) MCQ | Questions and Answers

1 .

A series circuit consists of three resistors. Two resistors are 1.2 kΩ each. The total resistance is 12 kΩ. The value of the third resistor is

A)

1.2 kΩ

B)

960 Ω

C)

9,600 Ω

D)

Cannot be determined

Correct Answer : 9,600 Ω

2 .

If you know the current anywhere in a series circuit, you know the current everywhere in a series circuit.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

3 .

Two 1.5 V cells are connected series opposing across two 100 Î© resistors in series. Total current flow is

A)

0 A

B)

2 mA

C)

5 mA

D)

15 mA

Correct Answer : 0 A

4 .

If a 6 V and a 9 V source are connected series aiding, the total voltage is

A)

3 V

B)

6 V

C)

9 V

D)

15 V

Correct Answer : 15 V

5 .

The following resistors (one each) are connected in a series circuit: 470 Ω, 680 Ω, 1 kΩ, and 1.2 kΩ. The voltage source is 20 V. Current through the 680 Ω resistor is approximately

A)

6 mA

B)

30 mA

C)

60 mA

D)

300 mA

Correct Answer : 6 mA

6 .

Two 6 V batteries are connected series aiding across two 1.2 kΩ resistors in series. Current through each resistor is

A)

0 A

B)

2.5 mA

C)

5 mA

D)

10 mA

Correct Answer : 5 mA

7 .

What is the current flow through R1, R2, and R3?

A)

1A, 1A, 1A

B)

1A, 2A, 3A

C)

3A, 2A, 1A

D)

3A, 3A, 3A

Correct Answer : 1A, 1A, 1A

Explaination : V = IR

V = I(R1 + R2 + R3)

I = V/(R1 + R2 + R3)

= 9/(3 + 3 + 3)

= 9/9

= 1 Amp.

8 .

One of the most common applications of a potentiometer is as an adjustable voltage divider, also known as

A)

divider control

B)

current control

C)

voltage control

D)

volume control

Correct Answer : volume control

9 .

If the resistance total in a series circuit doubles, current will:

A)

be doubled

B)

be halved

C)

be the same

D)

reduce source voltage

Correct Answer : be halved

10 .

Power is defined as_______

A)

work

B)

joules

C)

the conversion of energy

D)

the rate at which work is done

Correct Answer : the rate at which work is done

11 .

What is the dc source voltage?

A)

0 V

B)

13 V

C)

39 V

D)

78 V

Correct Answer :

12 .

All the voltage drops and the source voltage added together in a series circuit is equal to

A)

Zero

B)

The source voltage

C)

The total of the voltage drops

D)

The total of the source voltage and the voltage drops

Correct Answer : Zero

13 .

Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor is

A)

22 Î©

B)

88 Î©

C)

220 Î©

D)

880 Î©

Correct Answer : 220 Î©

14 .

Find the current in the circuit.

A)

1 A

B)

2 A

C)

3 A

D)

4 A

Correct Answer : 2 A

Explaination : I=V/R. Total resistance R = 20+40=60ohm. V=120V. I=120/60=2A.

15 .

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

A)

Voltage

B)

Current

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Current

Explaination : In a series circuit, the current across all elements remain the same and the total voltage of the circuit is the sum of the voltages across all the elements.

16 .

Voltage across the 60ohm resistor is______

A)

0V

B)

48V

C)

72V

D)

120V

Correct Answer : 0V

Explaination : The 60ohm resistance is shorted since current always choses the low resistance path. Voltage across short circuit is equal to zero, hence voltage across the resistor is 0.

17 .

'Series aiding' is a term sometimes used to describe voltage sources of the same polarity in series.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

18 .

A series circuit consists of three resistors with values of 120 Ω, 270 Ω, and 330 Ω. The total resistance is

A)

Less than 120 Ω

B)

120 Ω

C)

720 Ω

D)

The average of the values

Correct Answer : 720 Ω

19 .

A 12 V battery is connected across a series combination of 68 Ω, 47 Ω, 220 Ω, and 33 Ω. The amount of current is

A)

16.3 mA

B)

32.6 mA

C)

163 mA

D)

326 mA

Correct Answer : 32.6 mA

20 .

Calculate the voltage at point B in the given circuit.

A)

+0.94 V

B)

+2.6 V

C)

+3 V

D)

+10.48 V

Correct Answer : +10.48 V

21 .

In the given circuit, what type of failure will cause the voltage at point B to equal the voltage at point C?

A)

R₁ shorts

B)

R₂ shorts

C)

R₃ shorts

D)

R₂ opens

Correct Answer : R₂ shorts

22 .

A series circuit has a 24 V source and a total resistance of 120 Î©. The current through each resistor is

A)

20 mA

B)

24 mA

C)

120 mA

D)

200 mA

Correct Answer : 200 mA

23 .

The voltage at one point in a circuit is always measured relative to another point.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

24 .

A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is

A)

0 V

B)

0.6 V

C)

1.2 V

D)

6 V

Correct Answer : 6 V

25 .

Two resistors are in series: a 5.6 kΩ resistor and a 4.7 kΩ resistor. The voltage drop across the 5.6 kΩ resistor is 10 V. The voltage across the 4.7 kΩ resistor is

A)

0 V

B)

2.32 V

C)

8.39 V

D)

10 V

Correct Answer : 8.39 V

26 .

What is the voltage at points B to D in the given circuit?

A)

+8.8 V

B)

+19.2 V

C)

+28 V

D)

–19.2 V

Correct Answer : +19.2 V

27 .

Calculate the voltage at point C in the given circuit.

A)

+0.94 V

B)

+1.48 V

C)

+3 V

D)

+11.6 V

Correct Answer : +11.6 V

28 .

An 8-ohm resistor is in series with a lamp. The circuit current is 1 A. With 20 V applied, what voltage is being allowed for the lamp?

A)

4 V

B)

8 V

C)

12 V

D)

20 V

Correct Answer : 12 V

29 .

Find the voltage across the 6 ohm resistor.

A)

27.27V

B)

54.48V

C)

150V

D)

181.6V

Correct Answer : 27.27V

Explaination : Total current I=150/(6+12+15)=(150/33)V.
V across 6 ohm = 6*I = 6*(150/33)V = 27.27V.

30 .

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

A)

The other bulb also burns out

B)

The other bulb stops glowing

C)

The other bulb glows with increased brightness

D)

The other bulb continues to glow with the same brightness

Correct Answer : The other bulb stops glowing

Explanation : 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.

31 .

The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates

A)

3 W

B)

8 W

C)

12 W

D)

48 W

Correct Answer : 3 W

32 .

Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is

A)

0.3 A

B)

1 A

C)

3 A

D)

4 A

Correct Answer : 3 A

33 .

A short in a series circuit prevents current.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

34 .

To measure the current out of the second resistor in a circuit consisting of four resistors, an ammeter can be placed

A)

At any point in the circuit

B)

At the negative terminal of the source

C)

Between the second and third resistors

D)

Between the third and fourth resistors

Correct Answer : At any point in the circuit

35 .

A series circuit consists of a 4.7 kÎ©, a 12 kÎ©, and a 2.2 kÎ© resistor. The resistor that has the most voltage drop is

A)

The 2.2 kÎ©

B)

The 4.7 kÎ©

C)

The 12 kÎ©

D)

Impossible to determine from the given information

Correct Answer : The 12 kÎ©

36 .

The sum of all the voltage drops around a single closed loop in a circuit is zero.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

37 .

In a series circuit, the individual powers are additive.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

38 .

Which of the following series combinations dissipates the most power when connected across a 120 V source?

A)

One 220 Î© resistor

B)

Two 220 Î© resistors

C)

Three 220 Î© resistors

D)

Four 220 Î© resistors

Correct Answer : One 220 Î© resistor

39 .

If a 24 V and a 6 V battery are series opposing, the total voltage is

A)

0 V

B)

18 V

C)

24 V

D)

30 V

Correct Answer : 18 V

40 .

When a fourth resistor is connected in series with three resistors, the total resistance

A)

Increases

B)

Decreases

C)

Remains the same

D)

Increases by one-fourth

Correct Answer : Increases

41 .

The total resistance of eight 5.6 kÎ© resistors in series is

A)

8 Î©

B)

4,480 Î©

C)

5,600 Î©

D)

44,800 Î©

Correct Answer : 44,800 Î©

42 .

What is wrong, if anything, with this circuit?

A)

R1 is open.

B)

R2 is open.

C)

R1 is shorted.

D)

R2 is shorted.

Correct Answer : R1 is shorted.

43 .

Kirchhoff's voltage law states that:

A)

the algebraic sum of the resistances is equal to the sum of the voltages

B)

the algebraic sum of the individual currents around a closed loop is zero

C)

the voltages developed across each element in a series circuit are identical

D)

the sum of the voltage drops in a series circuit is equal to the total applied voltage

Correct Answer : the sum of the voltage drops in a series circuit is equal to the total applied voltage

44 .

If series current doubles, then:

A)

voltage is reduced

B)

voltage is doubled

C)

resistance is halved

D)

resistance is doubled

Correct Answer : resistance is halved

45 .

What is the value of x if the current in the circuit is 5A?

A)

15 ohm

B)

25 ohm

C)

55 ohm

D)

75 ohm

Correct Answer : 15 ohm

Explaination : Total voltage=sum of voltages across each resistor. =>150=10*5+5*5+5*x. Solving the equation, we get x=15 ohm.

46 .

A voltage across a series resistor circuit is proportional to?

A)

The power in the circuit

B)

The value of the resistance itself

C)

The amount of time the circuit was on for

D)

The value of the other resistances in the circuit

Correct Answer : The value of the resistance itself

Explanation : V=IR hence the voltage across a series resistor circuit is proportional to the value of the resistance.

47 .

The total resistance of a series circuit is equal to the difference between the largest and smallest value resistors.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

48 .

There are five resistors in a given series circuit and each resistor has 6 V dropped across it. The source voltage is

A)

6 V

B)

30 V

C)

Depends on the current flow

D)

Depends on the resistor values

Correct Answer : 30 V

49 .

When one of three series resistors is removed from a circuit and the circuit is reconnected, the current

A)

Increases

B)

Increases by one-third

C)

Decreases by one-third

D)

Decreases by the amount of current through the removed resistor

Correct Answer : Increases

50 .

A)

23 mA

B)

69 mA

C)

230 mA

D)

690 mA

Correct Answer : 230 mA

51 .

The term 'series opposing' means that sources are in series with opposite polarities.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

52 .

A series circuit acts as a current divider.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

53 .

A series circuit acts as a voltage divider.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

54 .

The total resistance of a circuit is 680 Ω. The percentage of the total voltage appearing across a 47 Ω resistor that makes up part of the total series resistance is

A)

6.91 %

B)

47 %

C)

68 %

D)

69 %

Correct Answer : 6.91 %

55 .

What are the minimum and maximum output voltages?

A)

0 V, 4 V

B)

0 V, 8 V

C)

0 V, 12 V

D)

0 V, 16 V

Correct Answer : 0 V, 16 V

56 .

What is the total power in the circuit?

A)

1.7 W

B)

17 W

C)

170 mW

D)

170 W

Correct Answer : 170 mW

57 .

A string of resistors in a series circuit will______

A)

reduce the power to zero

B)

cause the current to divide

C)

increase the source voltage in proportion to the values

D)

divide the source voltage in proportion to their values

Correct Answer : divide the source voltage in proportion to their values

58 .

What is the voltage measured across a series short?

A)

Zero

B)

Infinite

C)

The value of the source voltage

D)

None of the above

Correct Answer : Zero

Explanation : 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.

59 .

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

A)

It becomes zero

B)

It becomes double its original value

C)

It becomes half its original value

D)

It becomes infinity

Correct Answer : It becomes half its original value

Explanation : I=V/R. If R becomes 2R then I becomes I/2 i.e. half of its original value.

60 .

If 5 V and 16 V power supplies are connected in series-opposing, what is the total voltage?

A)

11 V

B)

16 V

C)

21 V

D)

80 V

Correct Answer : 11 V