Network Theory Mcqs

Q:

In a series RLC circuit having resistance R = 2 Ω, and excited by voltage V = 1 V, the average power is 250 mW. The phase angle between voltage and current is ___________

A) 75° B) 60°
C) 15° D) 45°
 
Answer & Explanation Answer: D) 45°

Explanation: Not available for this question

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5
Q:

Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is _____________

A) 10 mH B) 15 mH
C) 30 mH D) 90 mH
 
Answer & Explanation Answer: A) 10 mH

Explanation: Not available for this question

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5
Q:

A circuit consists of an excitation voltage VS, a resistor network and a resistor R. For different values of R, the values of V and I are as given, R = ∞, V = 5 volt; R = 0, I = 2.5 A; when R = 3 Ω, the value of V is __________

A) 1 V B) 2 V
C) 3 V D) 5 V
 
Answer & Explanation Answer: C) 3 V

Explanation: Not available for this question

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6
Q:

In a parallel RL circuit, 12 A current enters into the resistor R and 16 A current enters into the Inductor L. The total current I the sinusoidal source is ___________

A) 25 A B) 4 A
C) 20 A D) Cannot be determined
 
Answer & Explanation Answer: C) 20 A

Explanation: Not available for this question

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8
Q:

The current wave shape is in the form of a square terminating at t = 4sec. The voltage across the element increases linearly till t = 4 sec and then becomes constant. The element is ____________

A) Resistance B) Inductance
C) Capacitance D) Semi-conductor
 
Answer & Explanation Answer: C) Capacitance

Explanation: We know that, when a current pulse is applied to a capacitor, the voltage will have a waveform which rises linearly and then becomes constant towards the end of pulse. Hence, the element is a capacitor.

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8
Q:

A series RLC circuit has a resonant frequency of 550 Hz. The maximum voltage across C is likely to occur at a frequency of ___________

A) 1000 Hz B) 2000 Hz
C) 1025 Hz D) 500 Hz
 
Answer & Explanation Answer: D) 500 Hz

Explanation: We know that, maximum voltage across capacitance occurs at a frequency slightly less than resonant frequency.
Here, given that resonant frequency = 550 Hz.
So, out of the given options 500 is the lowest nearest integer to 550.
Hence, 975 Hz.

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7
Q:

When a lead acid battery is being charged, the specific gravity of the electrolyte will ___________

A) Decrease B) Increase
C) Either Increase or Decrease D) Neither Increase nor Decrease
 
Answer & Explanation Answer: B) Increase

Explanation: We know that the specific gravity of electrolyte is highest when battery is fully charged and is lowest when discharged. So, the specific gravity of the electrolyte will increase when a lead acid battery is being charged.

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8
Q:

Two capacitors of 0.5 μF and 1.5 μF capacitance are connected in parallel across a 110 V dc battery. The charges across the two capacitors after getting charged is ___________

A) 55 μC each B) 275 μC each
C) 55 μC and 275 μC respectively D) 275 μC and 55 μC respectively
 
Answer & Explanation Answer: C) 55 μC and 275 μC respectively

Explanation: Not available for this question

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