1.1 Basic MCQ

License Preparation NepalNEC ELECTRONICS

Full marks: 44 · Questions: 44

01Ohm's Law, Current, Voltage, Power and Energy

An electric current of 10 A is the same as ___________

10 J/C

10 V/C

10 C/sec

10 W/sec

02Ohm's Law, Current, Voltage, Power and Energy

Consider a circuit with two unequal resistances in parallel, then ___________

large current flows in large resistor

current is same in both

potential difference across each is same

smaller resistance has smaller conductance

03Ohm's Law, Current, Voltage, Power and Energy

In which of the following cases is Ohm's law not applicable?

Electrolytes

Arc lamps

Insulators

AC bridges

04Ohm's Law, Current, Voltage, Power and Energy

Which of the following bulbs will have high resistance?

220V, 60W

220V, 100W

115V, 60W

115V, 100 W

05Ohm's Law, Current, Voltage, Power and Energy

Ohm's law is not applicable to ___________

dc circuits

high currents

small resistors

semi-conductors

06Ohm's Law, Current, Voltage, Power and Energy

Conductance is expressed in terms of ___________

mho

mho/m

ohm/m

m/ohm

07Ohm's Law, Current, Voltage, Power and Energy

In a current-voltage relationship graph of a linear resistor, the slope of the graph will indicate ___________

conductance

resistance

resistivity

a constant

08Ohm's Law, Current, Voltage, Power and Energy

Which of the following type of circuits in electrical engineering cannot be analyzed using Ohm's law?

Unilateral

Bilateral

Linear

Conductors

09Ohm's Law, Current, Voltage, Power and Energy

When a bulb uses 0.25A from a 24V battery source, what is its Resistance (R)?

50 Ω

96 Ω

95 Ω

72 Ω

10Ohm's Law, Current, Voltage, Power and Energy

The Tungsten filament in a light bulb has a resistance of:

Linear

Non-Linear

Fixed

a & b are correct

11Ohm's Law, Current, Voltage, Power and Energy

Open circuit resistance is:

low

Infinitely High

Zero

a & b are correct

12Ohm's Law, Current, Voltage, Power and Energy

Short circuit resistance is:

low

Infinitely High

Zero

a & b are correct

13Ohm's Law, Current, Voltage, Power and Energy

A kilowatt-hour (kWh) is a big unit of _______________ electricity.

work

energy

conductance

power

14Ohm's Law, Current, Voltage, Power and Energy

In a conductor, if 6-coulomb charge flows for 2 seconds, the value of electric current will be:

3 ampere

3 volts

2 amperes

2 volts

15Ohm's Law, Current, Voltage, Power and Energy

Which of the following elements of electrical engineering cannot be analyzed using Ohm's law?

Capacitors

Inductors

Transistors

Resistance

16Ohm's Law, Current, Voltage, Power and Energy

Which of the following is correct about the power consumed by R1 and R2 connected in series if the value of R1 is greater than R2?

R1 will consume more power

R2 will consume more power

R1 and R2 will consume the same power

The relationship between the power consumed cannot be established

17Ohm's Law, Current, Voltage, Power and Energy

What kind of quantity is an Electric potential?

Vector quantity

Tensor quantity

Scalar quantity

Dimensionless quantity

18Series and Parallel Circuits

A certain circuit is composed of two parallel resistors. The total resistance is 1,403 Ω. One of the resistors is 2 kΩ. The other resistor value is:

1,403 Ω

4.7 kΩ

2 kΩ

3,403 Ω

19Series and Parallel Circuits

A voltage divider consists of two 100 kΩ resistors and a 12 V source. What will the voltage be if a load resistor of 1 MΩ is connected to the output?

0.57 V

6 V

12 V

5.7 V

20Series and Parallel Circuits

A Voltage divider consists of two 68 kΩ resistors and a 24 V source. The voltage across one of the resistors is:

12 V

24 V

0 V

6 V

21Series and Parallel Circuits

Two 3.3 kΩ resistors in series combination are in parallel with a 4.7 kΩ resistor. What will be the voltage across the 4.7 kΩ resistor if the voltage across one of the 3.3 kΩ resistors is 12 V?

24 V

12 V

0 V

6 V

22Series and Parallel Circuits

In a series circuit with a 10 V supply connected to resistors of 2 Ω, 1 Ω, and 2 Ω, calculate the voltage across the second 2 Ω resistor:

10V

23Series and Parallel Circuits

An 8 A current source feeds a parallel combination of a 1 Ω resistor and a 3 Ω resistor. Calculate the current i flowing through the 3 Ω resistor:

-1A

+2A

-5A

24Series and Parallel Circuits

For a parallel connected resistor pair R1 and R2 with total current I and voltage V, the current across the first resistor (R1) is given by:

I R1

I R2

I R1 / (R1 + R2)

I R2 / (R1 + R2)

25Star-Delta Transformation

A star network consists of resistors 4.53 Ω, 6.66 Ω, and 1.23 Ω. What are the equivalent delta resistances?

9.69 ohm, 35.71 ohm, 6.59 ohm

10.69 ohm, 35.71 ohm, 6.59 ohm

9.69 ohm, 34.71 ohm, 6.59 ohm

10.69 ohm, 35.71 ohm, 7.59 ohm

26Star-Delta Transformation

Which among the following is the correct expression for star-to-delta conversion from star resistances Ra, Rb, and Rc?

R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)

R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)

R1=Ra+Rb+Ra*Rb/Rc, R2=Rc+Rb+Rc*Rb/Ra, R3=Ra+Rc+Ra*Rc/Rb

R1=Ra*Rb/Rc, R2=Rc*Rb/Ra, R3=Ra*Rc/Rb

27Star-Delta Transformation

In a circuit where three 2 Ω resistors are connected in star and connected to outer resistors of 10 Ω, 5 Ω, and 10 Ω, find the equivalent resistance between terminals X and Y:

3.33 ohm

4.34 ohm

5.65 ohm

2.38 ohm

28Star-Delta Transformation

A delta connection in electric circuits is also known as a:

Y-connection

Mesh connection

Either Y-connection or mesh connection

Neither Y-connection nor mesh connection

29Star-Delta Transformation

Ra, Rb, and Rc are resistances connected in star at terminals A, B, and C. After transforming to delta, what is the resistance between B and C?

Rc+Rb+Rc*Rb/Ra

Rc+Rb+Ra*Rb/Rc

Ra+Rb+Ra*Rc/Rb

Rc+Rb+Rc*Ra/Rb

30Star-Delta Transformation

Ra, Rb, and Rc are resistances connected in star at terminals A, B, and C. After transforming to delta, what is the resistance between A and C?

Ra+Rb+Ra*Rb/Rc

Ra+Rc+Ra*Rc/Rb

Ra+Rb+Ra*Rc/Ra

Ra+Rc+Ra*Rb/Rc

31Star-Delta Transformation

Ra, Rb, and Rc are resistances connected in star at terminals A, B, and C. After transforming to delta, what is the resistance between A and B?

Rc+Rb+Ra*Rb/Rc

Ra+Rb+Ra*Rc/Rb

Ra+Rb+Ra*Rb/Rc

Ra+Rc+Ra*Rb/Rb

32Star-Delta Transformation

If 1 ohm, 2 ohm, and 32/3 ohm resistors are connected in star, find the equivalent delta connection:

34 ohm, 18.67 ohm, 3.19 ohm

33 ohm, 18.67 ohm, 3.19 ohm

33 ohm, 19.67 ohm, 3.19 ohm

34 ohm, 19.67 ohm, 3.19 ohm

33Star-Delta Transformation

If 8/9 ohm, 4/3 ohm, and 2/3 ohm resistors are connected in star, find its delta equivalent:

4ohm, 3ohm, 2ohm

1ohm, 3ohm, 2ohm

4ohm, 1ohm, 2ohm

4ohm, 3ohm, 1ohm

34Star-Delta Transformation

Three resistors of 10 Ω, 10 Ω, and 11 Ω are connected in star between nodes 1, 2, and 3. What is the equivalent delta resistance across nodes 1 and 3 opposite to the 11 Ω resistor?

32ohm

31ohm

30ohm

29ohm

35Kirchhoff's Laws

Kirchhoff's Current Law (KCL) is based on the fact that:

There is a possibility for a node to store energy.

There cannot be an accumulation of charge at a node.

Charge accumulation is possible at node

Charge accumulation may or may not be possible.

36Kirchhoff's Laws

According to KCL, if currents i1 and i5 enter a node while currents i2, i3, and i4 leave the node, what is the relation between the currents?

i1=i2=i3=i4=i5

i1+i4+i3=i5+i2

i1-i5=i2-i3-i4

i1+i5=i2+i3+i4

37Kirchhoff's Laws

The algebraic sum of voltages around any closed path in a network is equal to:

Infinity

Negative polarity

38Kirchhoff's Laws

In a circuit with two loops connected via a 4V source, with loop 1 (3V source, 3Ω and 5Ω resistors) and loop 2 (4V source, 2Ω and 3Ω resistors), calculate the potential difference between x and y (Vx - Vy):

4.275v

-4.275v

4.527v

-4.527v

39Kirchhoff's Laws

In a circuit with a 70V source, a series 5Ω resistor, and parallel branches of 7Ω and an unknown resistor R carrying 2A, find the value of R:

17.5 Ω

17.2 Ω

17.4 Ω

17.8 Ω

40Kirchhoff's Laws

In a three-mesh circuit with resistor values 11Ω, 7Ω, 15Ω and current sources 8A and 3A between meshes, determine the mesh currents I1, I2, and I3:

-3.3A, -8.5A, 2.4A

3A, -8A, 2A

3.3A, 8.5A, -2.4A

3.2A, 8.6A, 2.3A

41Kirchhoff's Laws

All _____________ are loops, but _______________ are not meshes.

Loops, Meshes

Meshes, loops

Branches, loops

Nodes, Branches

42Kirchhoff's Laws

In a single closed circuit loop with opposing DC voltage sources 10V, 5V, and 20V with resistors 5Ω, 2Ω, and 3Ω, solve for the circulating current I:

-0.5A

0.5A

-0.2A

0.2A

43Kirchhoff's Laws

The fundamental basic laws for analyzing an electric circuit are:

Einstein's theory

Newton's laws

Kirchhoff's laws

Faraday's laws

44Kirchhoff's Laws

A junction where two or more network elements meet is known as a:

Node

Branch

Loop

Mesh