Online Electronics and Communication Engineering Test - Networks Analysis and Synthesis Test 3

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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In figure the voltage drop across the 10 Ω resistance is 10 V. The resistance R

is 6 Ω

is 8 Ω

is 4 Ω

cannot be found

[#]

A network has two branches in parallel. One branch contains impedance Z₁ and the other branch has impedance Z₂. If it is fed from an ac voltage V of frequency f, the current through Z₁ depends, on

V, Z₁, Z₂

V, Z₁

Z₁, Z₂

V, Z₁, f

[#]

Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is

0.25 mH

0.5 mH

0.707 mH

1 mH

[#]

The rms voltage measured across each of the circuit element in figure is as shown, when the circuit is excited by a sinusoidal voltage E_s, the rms value of the source voltage e_s is

10 volt

2 volt

E_s

5 volt

[#]

The ABCD parameters of ideal n : 1 transformer shown in the figure are

. The value of X will be

1/n

n²

1/n²

[#]

The correct relation between joules and calories is

calories = joules/4.156

joules = calories/4.156

calories = joules x 10⁷/4.156

joules = calories x 10⁷/4.156

[#]

In figure V is ideal voltmeter having infinite resistance. It will read __________ volt.

100

[#]

A certain network has two ideal voltages sources and a large number of ideal resistances. The power consumed in one of the resistances is 4 W when either of two sources is active and the other source is active and the other source is short circuited. When both sources is short circuited.When both sources are active, the power consumed in the same resistor would be

zero or 16 W

4 W or 8 W

zero or 8 W

8 W or 16 W

[#]

Assertion (A): The impedance of a series resonant circuit is minimum at resonance.

Reason (R): Resonance condition implies unity power factor condition.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

[#]

10.

The following circuit resonates at

0.5 Hz

5 Hz

1 rad/sec

0.5 rad/sec

[#]

11.

A steel bar needs 1200 AT to magnetise it. The voltage that must be applied to the magnetising coil of 100 turns and 10 Ω resistance is __________ volt.

120

1200

[#]

12.

A reactance function is always a quotient of

even to odd polynomials

odd to even polynomials

even to odd or odd to even polynomials

even to even polynomials

[#]

13.

The Z parameter of the following T-network is

not possible

[#]

14.

Poor power factor

reduces load handling capability of electrical system

results in more power losses in the electrical system

overloads alternators, transformers and distribution lines

all

[#]

15.

In figure the effective resistance faced by voltage source is

1 Ω

2 Ω

3 Ω

3.3 Ω

[#]

16.

Which of the following statements is incorrect?

A mesh with two resistors has two mesh currents

The algebraic sum of all voltages around any mesh or any loop must be zero

The principle node is a function where branch current can divide or combine

A Norton is a series circuit

[#]

17.

In Z_RC (s) = constant at s = 0, the last element in first Foster cauer realization is

R and C in series

R and C in parallel

[#]

18.

For a series circuit of R and variable X_L the admittance locus is

a semicircle in first quadrant

a semicircle in fourth quadrant

a straight line in first quadrant

a straight line in fourth quadrant

[#]

19.

Norton's equivalent circuit

is same as Thevenin's circuit

has no relation with Thevenin's circuit

is dual of Thevenin's circuit

is reciprocal of Thevenin's circuit

[#]

20.

Assertion (A): In drawing an electric circuit analogous to a mechanical circuit, spring is replaced by capacitance.

Reason (R): The behaviour of a spring and capacitor are similar.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

[#]

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