# Multiple choice question for engineering

## Set 1

1. Find the value of the currents I1, I2 and I3 flowing clockwise in the first, second and third mesh respectively.

a) 1.54A, -0.189A, -1.195A

b) 2.34A, -3.53A, -2.23A

c) 4.33A, 0.55A, 6.02A

d) -1.18A, -1.17A, -1.16A

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2. Find the value of the currents I1 and I2 flowing clockwise in the first and second mesh respectively.

a) 5A, 0A

b) -5A, 0A

c) 0A, 5A

d) 0A, -5A

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3. Find the value of V if the current in the 3 ohm resistor=0.

a) 3.5V

b) 6.5V

c) 7.5V

d) 8.5V

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4. Find the value of V1 if the current through the 1 ohm resistor=0A.

a) 83.33V

b) 78.89V

c) 87.87V

d) 33.33V

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5. Calculate the mesh currents I1 and I2 flowing in the first and second meshes respectively.

a) 1.75A, 1.2A

b) 0.5A, 2.5A

c) 2.3A, 0.3A

d) 3.2A, 6.5A

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6. I1 is the current flowing in the first mesh. I2 is the current flowing in the second mesh and I3 is the current flowing in the top mesh. If all three currents are flowing in the clockwise direction, find the value of I1, I2 and I3.

a) 8A, 10A, 2A

b) 10A, 8A, 2A

c) 8A, 9A, 2A

d) 3A, 6A, 2A

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7. Calculate the mesh currents.

a) 7A, 6A, 6.22A

b) 2A, 1A, 0.57A

c) 3A, 4A, 5.88A

d) 6A, 7A, 8,99A

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8. Mesh analysis employs the method of ___________

a) KVL

b) KCL

c) Both KVL and KCL

d) Neither KVL nor KCL

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9. Mesh analysis is generally used to determine _________

a) Voltage

b) Current

c) Resistance

d) Power

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10. Mesh analysis can be used for __________

a) Planar circuits

b) Non-planar circuits

c) Both planar and non-planar circuits

d) Neither planar nor non-planar circuits

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## Set 2

1. The phenomenon due to which there is an induced current in one coil due to current in a neighbouring coil is?

a) Electromagnetism

b) Susceptance

c) Mutual inductance

d) Steady current

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2. If the current in one coil becomes steady, the magnetic field is?

a) Zero

b) Infinity

c) Doubles

d) Halves

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3. If the current in one coil is steady, what happens to the mutual inductance?

a) Zero

b) Infinity

c) Doubles

d) Halves

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4. What is the SI unit of mutual inductance?

a) Ohm

b) Henry

c) Volt

d) Siemens

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5. Which, among the following, is the correct expression for mutual inductance?

a) M=N2φ2/I2

b) M=N2φ2/I1

c) M=N1φ2/I2

d) M=N1φ1/I1

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6. If the flux linkage in coil 1 is 3Wb-t and it has 500 turns and the current in coil 2 is 2A, calculate the mutual inductance.

a) 750H

b) 500H

c) 450H

d) 900H

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7. The flux linkage in coil 1 is 3Wb-t and it has x turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H.

a) 300

b) 400

c) 500

d) 700

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8. The flux linkage in coil 1 is x Wb^{-t} and it has 500 turns and the current in coil 2 is 2A, calculate the value of x if the mutual inductance is 750H.

a) 1Wb^{-t}

b) 2Wb^{-t}

c) 3Wb^{-t}

d) 4Wb^{-t}

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^{-t}.

9. The flux linkage in coil 1 is 3 Wb-t and it has 500 turns and the current in coil 2 is xA, calculate the value of x if the mutual inductance is 750H.

a) 1A

b) 2A

c) 3A

d) 4A

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10. Practical application of mutual inductance is ____________

a) DC generator

b) AC generator

c) Transformer

d) Capacitor

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## Set 3

1. Find the value of the node voltage V.

a) 60V

b) 50V

c) 40V

d) 30V

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2. Calculate the node voltages V1 and V2.

a) 12V, 13V

b) 13V, 15V

c) 14V, 16V

d) 16V, 18V

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3. Find the node voltage V.

a) 1V

b) 2V

c) 3V

d) 4V

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4. Calculate the node voltages.

a) 24.32V, 4.09V, 7.04V

b) 32.34V, 7.87V, 8.78V

c) 34.34V, 8.99V, 8.67V

d) 45.44V, 6.67V, 7.77V

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5. Find the value of V1 and V2.

a) 87.23V, 29.23V

b) 23.32V, 46.45V

c) 64.28V, 16.42V

d) 56.32V, 78, 87V

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6. Nodal analysis is generally used to determine_______

a) Voltage

b) Current

c) Resistance

d) Power

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7. KCL is associated with_________

a) Mesh analysis

b) Nodal analysis

c) Both mesh and nodal

d) Neither mesh nor nodal

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8. If there are 10 nodes in a circuit, how many equations do we get?

a) 10

b) 9

c) 8

d) 7

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9. Nodal analysis can be applied for________

a) Planar networks

b) Non-planar networks

c) Both planar and non-planar networks

d) Neither planar nor non-planar networks

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10. How many nodes are taken as reference nodes in nodal analysis?

a) 1

b) 2

c) 3

d) 4

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## Set 4

1. The Norton current is the_______

a) Short circuit current

b) Open circuit current

c) Both open circuit and short circuit current

d) Neither open circuit nor short circuit current

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2. Norton resistance is found by?

a) Shorting all voltage sources

b) Opening all current sources

c) Shorting all voltage sources and opening all current sources

d) Opening all voltage sources and shorting all current sources

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3. Norton’s theorem is true for __________

a) Linear networks

b) Non-Linear networks

c) Both linear networks and nonlinear networks

d) Neither linear networks nor non-linear networks

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4. In Norton’s theorem Isc is__________

a) Sum of two current sources

b) A single current source

c) Infinite current sources

d) 0

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5. Isc is found across the ____________ terminals of the network.

a) Input

b) Output

c) Neither input nor output

d) Either input or output

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6. Can we use Norton’s theorem on a circuit containing a BJT?

a) Yes

b) No

c) Depends on the BJT

d) Insufficient data provided

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7. Calculate the Norton’s equivalent voltage for the following circuit if 5 ohm is the load resistance.

a) 10 ohm

b) 11 ohm

c) 12 ohm

d) 13 ohm

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8. Calculate the short circuit current is the 5 ohm resistor is the load resistance.

a) 0.72A

b) 0.32A

c) 0.83A

d) 0.67A

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9. Find the current in the 5 ohm resistance using Norton’s theorem.

a) 1A

b) 1.5A

c) 0.25A

d) 0.5A

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10. Which of the following is also known as the dual of Norton’s theorem?

a) Thevenin’s theorem

b) Superposition theorem

c) Maximum power transfer theorem

d) Millman’s theorem

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## Set 5

1. Ohm’s law for magnetic circuits is _________

a) F=ϕS

b) F=ϕ/S

c) F=ϕ^{2}S

d) F=ϕ/S^{2}

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2. What happens to the MMF when the magnetic flux decreases?

a) Increases

b) Decreases

c) Remains constant

d) Becomes zero

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3. Calculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb.

a) 10At

b) 10N

c) 15N

d) 15At

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4. A ring having a cross-sectional area of 500 mm^{2}, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the flux density of the ring.

a) 1.6T

b) 2.6T

c) 3.6T

d) 4.6T

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^{-6}/500*10

^{6}=1.6 Wb/m

^{2}.

5. A ring having a cross-sectional area of 500 mm^{2}, a circumference of and ϕ=800microWb 400 mm has a coil of 200 turns wound around it. Calculate the reluctance.

a) 1.68 * 10^{-4}A/Wb

b) 1.68 * 10^{4} A/Wb

c) 1.68 * 10^{6} A/Wb

d) 1.68 * 10^{-6}A/Wb

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^{-6}/500*10

^{6}=1.6 Wb/m

^{2}. Reluctance= 0.4/(380*4*pi*10

^{-7}*10

^{-4}*5)=1.68 * 10

^{6}A/Wb.

6. A ring having a cross-sectional area of 500 mm2, a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetomotive force.

a) 1442At

b) 1342At

c) 1432At

d) 1344At

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7. A ring having a cross-sectional area of 500 mm2 , a circumference of 400 mm and ϕ=800microWb has a coil of 200 turns wound around it. Calculate the magnetising current.

a) 6.7A

b) 7.7A

c) 7.6

d) 6.1A

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8. Can we apply Kirchhoff’s was to magnetic circuits?

a) Yes

b) No

c) Depends on the circuit

d) Insufficient information provided

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9. What is MMF?

a) Magnetic Machine Force

b) Magnetomotive Force

c) Magnetic Motion Force

d) Magnetomotion Force

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10. The equivalent of the current I in magnetic ohm’s law is?

a) Flux

b) Reluctance

c) MMF

d) Resistance