# Multiple choice question for engineering

## Set 1

1. Which of the following is the example to describe the efficiency of power transfer?

a) Communication systems

b) Power utility systems

c) Instrumentation systems

d) Telecom systems

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2. In a network maximum power transfer occurs when __________

a) R_{Th}= -R_{L}

b) R_{Th}/R_{L} =0

c) R_{Th}= R_{L}

d) R_{Th}+R_{L}= 1

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3. Maximum power in terms of the thevenin’s voltage and load resistance __________

a) (V_{Th}) 2 /4R_{L}

b) (V_{Th}) 2 *4R_{L}

c) (V_{Th}) 2 +4R_{L}

d) 4R_{L}/ (V_{Th}) 2

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_{max}= v*i= i*R*i= i2R

_{L}= (V

_{Th}/(R

_{Th}+R

_{L}))2*R

_{L}. Max power occurs when R

_{L}=R

_{Th}.

4. Calculate the maximum power delivered across R_{L} of the circuit given.

a) 900W

b) 1025W

c) 2025W

d) 1500W

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_{Th}/(R

_{Th}+R

_{L}))

^{2}*R

_{L}(R

_{Th}=R

_{L}) V

_{Th}= (150/150+30)*540= 450V R

_{Th}=(150*30)/180= 25Ω (the given resistors are in parallel).

5. Determine the maximum power delivered to the load in the network given.

a) 4.68W

b) 5.75W

c) 3.16W

d) 6.84W

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_{2}and reference path. It implies the thevenin’s voltage is V

_{2}. By using nodal analysis this voltage is found out. R

_{Th}=RL= 10Ω//5Ω and in series with 2Ω and then parallel with 3Ω=1.92Ω Max power = (V

_{Th})

^{ 2}/4R

_{L}= 4.688W.

6. The Superposition principle is obeyed by ____________

a) Linear networks

b) Non-linear networks

c) Lateral networks

d) Trilateral networks

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7. According to Superposition principle response in one element is the algebraic sum of responses by individual sources acting alone.

a) False

b) True

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8. Find the current in the 3Ω resistor of the given network using Superposition principle.

a) 2.5A

b) 3.125A

c) 6.525A

d) 5.625A

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_{eq}= 5+3=8Ω and Current I= 20/8=2.5A 2. When 5A source acting alone: 20v source is replaced by a short circuit. By current division rule, I

_{3}= 25/8=3.125A Total current through I

_{3}= 2.5+3.125=5.625A.

9. Find the current in 5Ω resistor near 12V source using superposition principle in network given

a) 2.9A

b) -2.9A

c) 1A

d) -1A

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10. If there are 5 sources in a network out of which 3 are dependent and 2 are independent. For superposition principle ___________ sources are considered.

a) 5

b) 3

c) 2

d) 0

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11. Find the current in the 1Ω resistor of the given circuit.

a) 4A

b) 1.33A

c) 2A

d) 0.66A

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12. Find the value of RL in given circuit.

a) 4Ω

b) 5Ω

c) 3Ω

d) 1.66Ω

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_{Th}=R

_{L}= (2//2) + 2=3Ω.

13. Calculate the maximum power delivered to load in the network given.

a) 1.56W

b) 1.66W

c) 2.33W

d) 2.79W

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_{Th}. (by using mesh analysis) 2. Calculation of Norton’s current. 3. Calculation of R

_{Th}. (R

_{Th}=V

_{Th}/I

_{N}) 4. R

_{Th}=R

_{L}and P

_{Max}= V

_{Th}/4R

_{L}.

14. In AC networks, maximum power is delivered when __________

a) Z_{L}*Z_{S}*=0

b) Z_{L}+Z_{S}*=1

c) Z_{L}=-Z_{S}*

d) Z_{L}=Z_{S}*

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15. Superposition principle states that at a time __________ source(S) acts.

a) All the given sources

b) Only voltage sources

c) Only one source

d) Only current sources

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## Set 2

1. ____________ helps in current measurement by placing it in ____________ with the circuit element.

a) Voltameter, Parallel

b) Ammeter, series

c) Voltmeter, series

d) Ammeter, parallel

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2. An ideal voltmeter has ___________ equivalent resistance and ideal ammeter has ___________ equivalent resistance.

a) Unity, Unity

b) Zero, infinite

c) Infinite, Zero

d) Zero, Zero

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3. Continuous voltages (or) current signals are measured using

a) Tachometers

b) Sonometers

c) Analog meters

d) Digital meters

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4. Digital meters are preferable than analog meters.

a) True

b) False

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5. A 20mv, 1mA d’Arsonval movement is used in an ammeter whose full-scale reading is 10 mA. Determine R_{A}.

a) 2.222Ω

b) 6.667Ω

c) 5.92Ω

d) 3.333Ω

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^{-3 }= 9 * 10

^{-3}R

_{A}R

_{A}= 2.222Ω.

6. A 25mv, 2mA d’Arsonval movement is to be used in voltmeter whose full scale reading is 100v. The resistance inserted by 100v meter into circuit is ___________

a) 1 * 10^{5}Ω

b) 1 * 10^{6}Ω

c) 1 * 10^{4}Ω

d) 1 * 10^{3}Ω

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7. An ideal voltmeter functions as __________ circuit

a) A short

b) An open

c) A power

d) An infinite

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8. An ideal ammeter functions as __________ circuit

a) A short

b) An open

c) A power

d) An infinite

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9. A 100mv, 5mA d’Arsonval movement is to be used in an ammeter whose full-scale reading is 1A. Calculate RA.

a) 0.7 ohms

b) 0.5 ohms

c) 0.1 ohms

d) 0.2 ohms

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_{A}. V = iR = 100 * 10

^{-3}= 995 * 10

^{-3}R

_{A}RA = 0.100Ω.

10. A 122mv, 12mA d’Arsonval movement is to be used in voltmeter whose full scale reading is 120v. The resistance inserted by 120v _____________

a) 1200Ω

b) 12000Ω

c) 1000Ω

d) 10,000Ω

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^{-3}= 10,000Ω.

## Set 3

1. Nodal analysis is mainly based on __________

a) KCL

b) KVL

c) Wheatstone bridge principle

d) Faraday’s electric laws

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2. If there are n nodes, then how many node-voltage equations are required?

a) n

b) n+1

c) n-1

d) 1

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3. Find VA and VB using Node-Voltage method in the given circuit.

a) 2.5V, 3.6V

b) 2.87V, 3.25V

c) 2.65V, 3.47V

d) 3.15V, 2.76V

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_{A}/2 + (V

_{A}-1)/2 + (V

_{A}-V

_{B})/1 =2 Node B: (V

_{B}-2)/2 + (VB-V

_{A})/1 =1 By solving the above equations required voltages are obtained.

4. A supernode is between _____________

a) Essential node and reference node

b) Two reference nodes

c) Two essential nodes

d) Essential node and neutral path

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5. Find V3 in the circuit given below.

a) 4.833V

b) 2.616V

c) -4.833V

d) -2.616V

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_{3}-V

_{2}= 5V Node1: 166V

_{1}-100V

_{2}-66V

_{3}=132 Node3: -166V

_{1}+265V

_{2}+99V

_{3}=0 On solving the required voltage is obtained.

6. Find all the node voltages in the given circuit containing dependent sources.

a) 10V, 20V, 30V, 40V

b) 15V, 25V, 32V, 45V

c) 10V, -20V, 30V, -40V

d) -15V, 25V, -35V, 45V

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_{C}-V

_{B}=5i

_{X}And ix = (V

_{B}-V

_{A})/5. On solving remaining nodes and forming equations, the required voltage values at nodes are obtained.

7. What is the voltage at 2nd terminal in the given circuit?

a) 132.57V

b) 137.25V

c) 173.25V

d) 123.57V

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_{1}=135V. Using this, V

_{2}can be calculated.

8. If there are 5 nodes then the no of nodal equations are ___________

a) 5

b) 0

c) 1

d) 4

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9. If there are (N-2+3) Node-Voltage equations then the number of nodes in the circuit are __________

a) N+2

b) N+1

c) N

d) N-1

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10. The reference node is also known as __________

a) Essential node

b) Principle node

c) Datum node

d) Neutral node

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11. If there are 9 nodes, then how many node-voltage equations are required?

a) 9

b) 10

c) 8

d) 1

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12. There are 13 branches in a complicated network and nearly 8 nodes. How many equations are required to solve the circuit in node-voltage method?

a) 7

b) 13

c) 5

d) 6

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## Set 4

1. Which method is best for voltage sources?

a) Mesh analysis

b) Nodal analysis

c) Superposition principle

d) Differentiation method

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2. When there is a current source between two loops which method is preferred?

a) Mesh-voltage analysis

b) Node-current analysis

c) Supermesh

d) Supernode

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3. Determine the current through 5Ω resistor in the network given below.

a) 3.38A

b) 6.01A

c) 3.27A

d) 1.27A

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4. Find the power supplied by the dependent voltage source in the circuit given below.

a) 400W

b) 383W

c) 412W

d) 148W

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_{1}=5A, I

_{2}=-1.47A, I

_{3}=0.56A .Power supplied by dependent voltage source =0.4V

_{1}(I

_{1}-I

_{2}).

5. Determine the voltage V_{2} of the network given.

a) 0V

b) 1V

c) 4/7V

d) -4/7V

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_{1}=4/7V and V

_{2}=0 (since there is no voltage source near node2).

6. If there are b branches and n nodes, then how many node-voltage equations are required?

a) n

b) b+1

c) n-1

d) b

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7. There are 6 branches and 2 essential nodes then 3 equations are required to describe a circuit in the mesh-current method.

a) True

b) False

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8. Determine V_{1} of the given network.

a) -0.17V

b) 4.83V

c) 5V

d) 2.62V

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_{3}-V

_{2}=5. Applying KCL at node1 and at supernode gives the equations which on solving, required voltages are obtained.

9. When there is a voltage source between two nodes which method is preferred?

a) Mesh-voltage analysis

b) Node-current analysis

c) Supermesh

d) Supernode

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10. Which is the best-preferred method to calculate currents flowing in the circuit?

a) Mesh-voltage analysis

b) Node-current analysis

c) Superposition principle

d) Duality principle

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## Set 5

1. By using source transformation voltage source in series resistor is replaced by __________

a) Voltage source in series with a resistor

b) Current source in parallel with a resistor

c) Voltage source in parallel with a resistor

d) Current source in series with a resistor

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2. Source Transformation is _____________

a) Unilateral

b) Unique

c) Bilateral

d) Complicated

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3. If there are two resistors in parallel and in series with a voltage source then ___________

a) Parallel resistor has no effect

b) Series resistor has no effect

c) Both has their respective effects

d) Both has no effect on the voltage source

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4. Using source transformation, calculate the voltage.

a) 4.33V

b) 39V

c) 0.230V

d) 36V

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5. Which element(s) has no effect in the given circuit?

a) 7Ω

b) 10Ω

c) Both 7Ω and 10Ω

d) Voltage source.

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6. The value of current source is __________ after replacing the given network with a single current source and a resistor.

a) 70V

b) 60V

c) 90V

d) 80V

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7. If there is a 12A current source in series with 2Ω and in parallel with a 4Ω resistor, then voltage V=?

a) 24V

b) 48V

c) 3V

d) 6V

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8. Find the current flowing through 4Ω resistor shown in network below.

a) 1.33A

b) 2.35A

c) 1.66A

d) 2.66A

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_{4Ω}= 5*(2/2+4) =1.66A.

9. Calculate the power delivered by the 50V source.

a) 274W

b) 276W

c) 285W

d) 291W

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10. Source transformation can be used for dependent sources.

a) True

b) False

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11. Using source transformation, calculate vm.

a) 2v

b) -2v

c) 1v

d) -1v

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12. Find the voltage value Vm in the circuit given below.

a) -3V

b) 3V

c) 2.1V

d) -2.1V

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13. Source transformation technique is mainly based on __________ law.

a) Newton’s

b) Kirchhoff’s

c) Ohm’s

d) Einstein’s

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14. In source transformation,

a) Voltage sources remain same

b) Current sources remain same

c) Both voltage and current sources undergo change

d) Resistances/Impedances remain same

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15. If there are five 20V voltage sources in parallel, then in source transformation __________

a) All are considered

b) Only one is considered

c) All are ignored

d) Only 2 are considered