Online Electronics and Communication Engineering Test - Networks Analysis and Synthesis Test 2

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Total number of questions: 20.
Time allotted: 30 minutes.
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A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using

2 wattmeter
one wattmeter
3 wattmeter

Which of the above statements is correct?

1 and 2

1 and 3

2 and 3

3 alone

[#]

In figure, E = 1 V (rms value). The average power is 250 mW. Then phase angle between E and I is

90°

60°

45°

30°

[#]

In the circuit shown in figure, for different values of R, the values of V and I are given. Other elements remaining the same. when R = ∞, V = 5 volt

R = 0, I = 2.5 A
R = 3 Ω, the value of V is given by

1 V

2 V

3 V

5 V

[#]

Figure shows an RC circuit. The magnitude plot V₂/V₁

will rise exponentially to R₂/(R₁ + R₂) as ω → ∞

will rise linearly to R₂/(R₁ + R₂) as ω → ∞

will decrease to zero as ω → ∞

will rise 1 at ω = 0 and then decrease as ω → ∞

[#]

A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is

0.5 C

1 C

2 C

4 C

[#]

In figure, the effective resistance across AB is

R - 1

R/2

[#]

In the circuit of figure the current through 3 Ω resistance at t = 0⁺ is

4 A

2.5 A

3.1 A

[#]

For the ladder network of figure, open circuit driving point impedance at port 1 =

[#]

A resistance R, inductance L and capacitance C are in series. The source frequency is adjusted to be equal to resonant frequency. The lower half power frequency is ω₁. Another resistance R is added in series with the circuit. The new lower half power frequency will be

ω₁

less than ω₁

more than ω₁

either more than ω₁ or less then ω₁

[#]

10.

For a high pass filter, β = p in attenuation band.

True

False

[#]

11.

The electrochemical equivalent of a material

depends on its valency

depends on its atomic weight

depends on its valency and atomic weight

depends on the degree of hardness of the material

[#]

12.

The time constant of the capacitance circuit is defined as the time during which voltage

falls to 36.8% of its final steady value

rises to 38.6% of its final steady value

rises to 63.2% of its final steady value.

none of the above.

[#]

13.

When a current flows through a coil of insulated wire, the coil shows the properties of a magnet.

True

False

[#]

14.

In a series RLC circuit for lower frequency power factor is __________ .

leading, Lagging

lagging, Leading

independent of frequency

same

[#]

15.

Assertion (A): Charge is dual of flux.

Reason (R): Short circuit is dual of open circuit.

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

[#]

16.

The shot circuit admittance matrix of a two port network is

non-reciprocal and passive

non-reciprocal and active

reciprocal and passive

reciprocal and active

[#]

17.

A choke coil of resistance R and inductance L is shunted by capacitor C. The dynamic resistance is

R/LC

C/RL

L/RC

1/RLC

[#]

18.

A parallel ac circuit in resonance will

act like a resistor of low value

have a high impedance

have current in each section equal to the line current

have a high voltage developed across each inductive and capacitive section

[#]

19.

Assertion (A): If Z₁(s) and Z₂(s) are positive real then Z₁(s) + Z₂(s) as well as 1/Z₁(s) and 1/Z₂(s) are positive real.

Reason (R): The poles of a positive real function are real or occur in conjugate pairs.

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

[#]

20.

In a series RLC circuit, the value of resistance for critical damping is

L/C

(L/C)^0.5

1/LC

2/L/C

[#]

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