A good current buffer has

high input impedance and low output impedance

low input impedance and low output impedance

low input impedance and high output impedance

high input impedance and low output impedance

high input impedance and high output impedance

Convert the given circuit into its equivalent delta circuit.

RAC = 22 Ω, RBC = 11 Ω, RAB = 7.33 Ω

RAC = 11 Ω, RBC = 12 Ω, RAB = 6 Ω

RAC = 10 Ω, RBC = 8 Ω, RAB = 6 Ω

RAC = 11 Ω, RBC = 22 Ω, RAB = 7.33 Ω

Based on the property of conductivity, select the odd one from the following.Eureka, synthetic resin, specific anti-thermal glass (pyrex), pressboard

Special anti-thermal glass (Pyrex)

Assertion (A): Shot noise is due to random variations in current flow in active devices.Reason (R): Current is a flow of carriers each of which carries a finite amount of charge.

Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true, but (R) is not the correct explanation of (A)

In the given circuit, which of the following options does NOT hold true?

\(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\)

\(\dfrac{1}{V_{\left(s\right)}}=\dfrac{1}{V_1}+\dfrac{1}{V_2}+\dfrac{1}{V_3}\)

\(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\)

Ohm's law does not apply:

At low-density circuits of electric current

In the given circuit, the mesh currents I1, I2 and I3 are

I1 = 2 A, I2 = 3 A and I3 = 4 A

I1 = 1 A, I2 = 2 A and I3 = 3 A

I1 = 2 A, I2 = 3 A and I3 = 4 A

I1 = 3 A, I2 = 4 A and I3 = 5 A

I1 = 4 A, I2 = 5 A and I3 = 6 A

How will the total capacitance change, when two capacitors are connected in parallel?

The total capacitance decreases

The total capacitance increases

The total capacitance decreases

The mean value gives the new capacitance

The total capacitance is found by reciprocal equation

A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to _____.

ohmic loss due to ohmic resistance of plates

Both ohmic loss due to ohmic resistance of plates and loss of energy in the dielectric

439 + Mcqs in Network Elements in Network Theory Page 4 McqOptions

151.	Calculate the value of maximum safe current (in A) that can flow in a 50 Ohms, 4 W resistor.
A.	0.28
B.	1.28
C.	2.28
D.	3.28
Answer» B. 1.28

Discussion

152.	Determine the current flowing through the 7-Ω and 3-Ω resistors, respectively, in the following circuit.
A.	5 A and 4.8 A
B.	10.56 A and 24.65 A
C.	11.254 A and 9.582 A
D.	2 A and 4 A
Answer» C. 11.254 A and 9.582 A

Discussion

153.	In the diagram below, what is the current in the 1 Ω resistor?
A.	4.12 A
B.	3 A
C.	1 A
D.	4 A
Answer» C. 1 A

Discussion

154.	A good current buffer has
A.	low input impedance and low output impedance
B.	low input impedance and high output impedance
C.	high input impedance and low output impedance
D.	high input impedance and high output impedance
Answer» C. high input impedance and low output impedance

Discussion

155.	Convert the given circuit into its equivalent delta circuit.
A.	RAC = 22 Ω, RBC = 11 Ω, RAB = 7.33 Ω
B.	RAC = 11 Ω, RBC = 12 Ω, RAB = 6 Ω
C.	RAC = 10 Ω, RBC = 8 Ω, RAB = 6 Ω
D.	RAC = 11 Ω, RBC = 22 Ω, RAB = 7.33 Ω
Answer» E.

Discussion

156.	In a R-L-C series circuit, R = 10 Ω, L = 1 H and C = 1 μF. It is connected to 230 V a.c. source of variable frequency. When the frequency is set to zero, circuit current will be
A.	23 A
B.	11.5 A
C.	46 A
D.	zero
Answer» E.

Discussion

157.	How much energy does a 100-W electric bulb consume in two hours?
A.	7200 J
B.	720 J
C.	720 kJ
D.	72 kJ
Answer» D. 72 kJ

Discussion

158.	Based on the property of conductivity, select the odd one from the following.Eureka, synthetic resin, specific anti-thermal glass (pyrex), pressboard
A.	pressboard
B.	Eureka
C.	Special anti-thermal glass (Pyrex)
D.	Artificial resin
Answer» C. Special anti-thermal glass (Pyrex)

Discussion

159.	Find the power developed by the current source.
A.	3 W
B.	2 W
C.	4 W
D.	1 W
Answer» B. 2 W

Discussion

160.	In the following circuit, what is the voltage drop across the 1.5 Ω resistor?
A.	2.25 V
B.	2.5 V
C.	1.5 V
D.	2 V
Answer» B. 2.5 V

Discussion

161.	Analyze the following diagram and find the electric current in the 8 Ω resistor.
A.	1.895 A
B.	1.632 A
C.	2.434 A
D.	0.263 A
Answer» C. 2.434 A

Discussion

162.	Find the electric current in the series combination of 8 Ω and 4 Ω resistors in the following circuit.
A.	0.75 A
B.	0.25 A
C.	0.5 A
D.	1 A
Answer» D. 1 A

Discussion

163.	Potential difference is measured in ___________.
A.	Watt
B.	Joule
C.	Volts
D.	Ampere
Answer» D. Ampere

Discussion

164.	Obtain the equivalent resistance of three 60 Ω resistors in parallel.
A.	10Ω
B.	30 Ω
C.	20 Ω
D.	180 Ω
Answer» D. 180 Ω

Discussion

165.	Determine the resistance (in Ohms) of resistor when the potential difference between the ends of the resistor is 24 V and the current flowing through the resistor is 3 A.
A.	12
B.	10
C.	8
D.	4
Answer» D. 4

Discussion

166.	If all the three resistances of a given DELTA network are 15 Ω each, then three resistances of the equivalent star will be
A.	45 Ω each
B.	30 Ω each
C.	15 Ω each
D.	5 Ω each
Answer» E.

Discussion

167.	In the following circuit, determine the current l1 by using mesh analysis.
A.	3.52 A
B.	6.6 A
C.	6.3 A
D.	1.71 A
Answer» E.

Discussion

168.	An ideal current source has zero
A.	Internal conductance
B.	Internal resistance
C.	Voltage on no load
D.	Ripple
Answer» B. Internal resistance

Discussion

169.	Assertion (A): Shot noise is due to random variations in current flow in active devices.Reason (R): Current is a flow of carriers each of which carries a finite amount of charge.
A.	Both (A) and (R) are true and (R) is the correct explanation of (A)
B.	Both (A) and (R) are true, but (R) is not the correct explanation of (A)
C.	(A) is true, but (R) is false
D.	(A) is false, but (R) is true
Answer» B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Discussion

170.	An electric bulb of 100 W is connected to a 250 V alternating current (AC) supply. How much current is there in the circuit?
A.	0.3 A
B.	0.6 A
C.	0.4 A
D.	4 A
Answer» D. 4 A

Discussion

171.	In the given circuit, which of the following options does NOT hold true?
A.	\(I_{total}=I_1+I_2+I_3\)
B.	\(\dfrac{1}{V_{\left(s\right)}}=\dfrac{1}{V_1}+\dfrac{1}{V_2}+\dfrac{1}{V_3}\)
C.	\(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\)
D.	VS = V1 = V2 = V3
Answer» C. \(\dfrac{1}{R{\left(total\right)}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}\)

Discussion

172.	A capacitor can be represented by a capacitance and a resistance in parallel. For a good capacitor, this parallel resistance is ________.
A.	Very high
B.	Very low
C.	Low
D.	None of these
Answer» B. Very low

Discussion

173.	An air-cored soleniod of 250 turns has a cross-sectional area A = 80 cm2 and length l = 100 cm. The value of its inductance is
A.	0.425 mH
B.	0.628 mH
C.	0.751 mH
D.	0.904 mH
Answer» C. 0.751 mH

Discussion

174.	Permittivity is expressed in ____________.
A.	Farad
B.	Farad/mm
C.	Farad/m
D.	Farad/mm2
Answer» D. Farad/mm2

Discussion

175.	A benchtop dc power supply acts as an ideal 4 A current source as long as its terminal voltage is below 10 V. Beyond this point, it begins to behave as an ideal 10 V voltage source for all load currents going down to 0 A. When connected to an ideal rheostat, find the load resistance value at which maximum power is transferred, and the corresponding load voltage and current.
A.	Short, ∞ A, 10 V
B.	Open, 4 A, 0 V
C.	2.5 Ω, 4 A, 10 V
D.	2.5 Ω, 4 A, 5 V
Answer» D. 2.5 Ω, 4 A, 5 V

Discussion

176.	A nichrome wire used as a coil in a heater has a resistance of 2 Ω/m. What will be the length of wire required for a 1 kW heater at 200 V?
A.	80 m
B.	40 m
C.	20 m
D.	24 m
Answer» D. 24 m

Discussion

177.	______ is the rate of energy consumed or supplied by an electrical component in reference to time.
A.	Voltage
B.	Power
C.	Current
D.	Frequency
Answer» C. Current

Discussion

178.	In the network shown in the given figure, find the current through R3.
A.	5 A
B.	2 A
C.	3 A
D.	1 A
Answer» E.

Discussion

179.	Ohm's law does not apply:
A.	on high voltage circuits
B.	on carbon resistors
C.	At low-density circuits of electric current
D.	on vacuum tubes
Answer» E.

Discussion

180.	In the given circuit, the mesh currents I1, I2 and I3 are
A.	I1 = 1 A, I2 = 2 A and I3 = 3 A
B.	I1 = 2 A, I2 = 3 A and I3 = 4 A
C.	I1 = 3 A, I2 = 4 A and I3 = 5 A
D.	I1 = 4 A, I2 = 5 A and I3 = 6 A
Answer» B. I1 = 2 A, I2 = 3 A and I3 = 4 A

Discussion

181.	For the circuit given below, current through 1 Ω resistance is:
A.	1.14 A
B.	2 A
C.	1.43 A
D.	1.67 A
Answer» D. 1.67 A

Discussion

182.	In the circuit shown, what is the voltage V across the 10 Ω resistor?
A.	6.67 V
B.	10.03 V
C.	16.7 V
D.	23.34 V
Answer» E.

Discussion

183.	An ideal constant current source is connected in series with an ideal constant voltage source. Considering both together, the combination will give______.
A.	Constant voltage source
B.	Constant current source
C.	Constant power source
D.	None of the above
Answer» C. Constant power source

Discussion

184.	How will the total capacitance change, when two capacitors are connected in parallel?
A.	The total capacitance increases
B.	The total capacitance decreases
C.	The mean value gives the new capacitance
D.	The total capacitance is found by reciprocal equation
Answer» B. The total capacitance decreases

Discussion

185.	Ideal current source have
A.	Zero internal resistance
B.	Infinite internal resistance
C.	Low value of voltage
D.	Large value of current
Answer» C. Low value of voltage

Discussion

186.	A 12 Ω resistor is connected in parallel with a 6 Ω resistor. What will be the equivalent resistance?
A.	6 Ω
B.	4 Ω
C.	18 Ω
D.	12 Ω
Answer» C. 18 Ω

Discussion

187.	Find the electric current at 4 Ω resistor.
A.	1.632 A
B.	1.895 A
C.	0.263 A
D.	2.434 A
Answer» D. 2.434 A

Discussion

188.	At 0° C, a copper sample has a resistance of 4 mΩ and its resistance has a temperature coefficient of 1/234.5 per °C. Find its resistance at 70 °C.
A.	4.52 mΩ
B.	5.19 mΩ
C.	4.22 mΩ
D.	5.55 mΩ
Answer» C. 4.22 mΩ

Discussion

189.	A capacitor consists of two conducting surfaces separated by a/an ________.
A.	semiconductor
B.	alloy
C.	metal
D.	insulator
Answer» E.

Discussion

190.	A 4-ohm resistor is connected in a circuit containing 4 V supply. The current drawn is
A.	8 A
B.	4 A
C.	1 A
D.	16 A
Answer» D. 16 A

Discussion

191.	A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to _____.
A.	ohmic loss due to ohmic resistance of plates
B.	loss of energy in dielectric
C.	capacitive reactance in ohms
D.	Both ohmic loss due to ohmic resistance of plates and loss of energy in the dielectric
Answer» E.

Discussion

192.	Determine the potential difference (in V) between nodes B and D.
A.	-5
B.	5
C.	-6
D.	6
Answer» D. 6

Discussion

193.	A delta connection of 1 ohm in each branch is converted into star connection. This star connection will have value in each branch:
A.	1/3 ohm
B.	2/3 ohm
C.	1 ohm
D.	3 ohm
Answer» B. 2/3 ohm

Discussion

194.	For the given circuit, the current through 3 Ω resistance is:
A.	2 A
B.	3.5 A
C.	1.7 A
D.	3 A
Answer» B. 3.5 A

Discussion

195.	A capacitor stores energy in
A.	Dielectric dipole
B.	A magnetic field
C.	An electromagnetic field
D.	All the above
Answer» B. A magnetic field

Discussion

196.	A quantity which changes its polarity at regular intervals of time is called:
A.	an alternating quantity
B.	DC quantity
C.	non-periodic quantity
D.	time independent quantity
Answer» B. DC quantity

Discussion

197.	A capacitor of 100 μF stores 10 mJ of energy. What is the amount of charge (in coulomb) stored in it?
A.	1.414 × 10-6
B.	1.414 × 10-3
C.	2.303 × 10-6
D.	2.303 × 10-3
Answer» C. 2.303 × 10-6

Discussion

198.	One kilowatt-hour of electrical energy is the same as:
A.	36 × 105 watt
B.	36 × 105 ergs
C.	36 × 105 joules
D.	36 × 105 B.T.U.
Answer» D. 36 × 105 B.T.U.

Discussion

199.	1 kcal is approximately equal to ______.
A.	4200 wat-sec
B.	420 joules
C.	4.2 joules
D.	420 watt-hour
Answer» B. 420 joules

Discussion

200.	Determine the heat dissipated (in Joule) through a conductor of 10 ohms resistance, when 1 A of current is flowing through the conductor for 5 seconds.
A.	50
B.	40
C.	20
D.	60
Answer» B. 40

Discussion

Explore topic-wise MCQs in Network Theory.

Calculate the value of maximum safe current (in A) that can flow in a 50 Ohms, 4 W resistor.

Determine the current flowing through the 7-Ω and 3-Ω resistors, respectively, in the following circuit.

In the diagram below, what is the current in the 1 Ω resistor?

A good current buffer has

Convert the given circuit into its equivalent delta circuit.

In a R-L-C series circuit, R = 10 Ω, L = 1 H and C = 1 μF. It is connected to 230 V a.c. source of variable frequency. When the frequency is set to zero, circuit current will be

How much energy does a 100-W electric bulb consume in two hours?

Based on the property of conductivity, select the odd one from the following.Eureka, synthetic resin, specific anti-thermal glass (pyrex), pressboard

Find the power developed by the current source.

In the following circuit, what is the voltage drop across the 1.5 Ω resistor?

Analyze the following diagram and find the electric current in the 8 Ω resistor.

Find the electric current in the series combination of 8 Ω and 4 Ω resistors in the following circuit.

Potential difference is measured in ___________.

Obtain the equivalent resistance of three 60 Ω resistors in parallel.

Determine the resistance (in Ohms) of resistor when the potential difference between the ends of the resistor is 24 V and the current flowing through the resistor is 3 A.

If all the three resistances of a given DELTA network are 15 Ω each, then three resistances of the equivalent star will be

In the following circuit, determine the current l1 by using mesh analysis.

An ideal current source has zero

Assertion (A): Shot noise is due to random variations in current flow in active devices.Reason (R): Current is a flow of carriers each of which carries a finite amount of charge.

An electric bulb of 100 W is connected to a 250 V alternating current (AC) supply. How much current is there in the circuit?

In the given circuit, which of the following options does NOT hold true?

A capacitor can be represented by a capacitance and a resistance in parallel. For a good capacitor, this parallel resistance is ________.

An air-cored soleniod of 250 turns has a cross-sectional area A = 80 cm2 and length l = 100 cm. The value of its inductance is

Permittivity is expressed in ____________.

A nichrome wire used as a coil in a heater has a resistance of 2 Ω/m. What will be the length of wire required for a 1 kW heater at 200 V?

______ is the rate of energy consumed or supplied by an electrical component in reference to time.

In the network shown in the given figure, find the current through R3.

Ohm's law does not apply:

In the given circuit, the mesh currents I1, I2 and I3 are

For the circuit given below, current through 1 Ω resistance is:

In the circuit shown, what is the voltage V across the 10 Ω resistor?

An ideal constant current source is connected in series with an ideal constant voltage source. Considering both together, the combination will give______.

How will the total capacitance change, when two capacitors are connected in parallel?

Ideal current source have

A 12 Ω resistor is connected in parallel with a 6 Ω resistor. What will be the equivalent resistance?

Find the electric current at 4 Ω resistor.

At 0° C, a copper sample has a resistance of 4 mΩ and its resistance has a temperature coefficient of 1/234.5 per °C. Find its resistance at 70 °C.

A capacitor consists of two conducting surfaces separated by a/an ________.

A 4-ohm resistor is connected in a circuit containing 4 V supply. The current drawn is

A pure capacitance connected across 50 Hz, 230 V supply consumes 0.04 W. This consumption is attributed to _____.

Determine the potential difference (in V) between nodes B and D.

A delta connection of 1 ohm in each branch is converted into star connection. This star connection will have value in each branch:

For the given circuit, the current through 3 Ω resistance is:

A capacitor stores energy in

A quantity which changes its polarity at regular intervals of time is called:

A capacitor of 100 μF stores 10 mJ of energy. What is the amount of charge (in coulomb) stored in it?

One kilowatt-hour of electrical energy is the same as:

1 kcal is approximately equal to ______.

Determine the heat dissipated (in Joule) through a conductor of 10 ohms resistance, when 1 A of current is flowing through the conductor for 5 seconds.