A_C Fundamentals_ Circuits And Circuit Theory — Part 2 MCQs with Explanations

A line which represents the magnitude and phase of an alternating quantity is the correct answer to “A phasor is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Reduce eddy current loss is the correct answer to “In AC. circuits, laminated iron is invariably used in order to”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Unity is the correct answer to “The power factor of a D.C. circuit is always”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

The statement given is false is the correct answer to “A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Minimum is the correct answer to “In a series resonant circuit, the impedance of the circuit is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Will increase the selectivity of the circuit is the correct answer to “In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Both B and C is the correct answer to “Power factor of the following circuit will be zero”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

$$\frac{{{\text{Root Mean Square value}}}}{{{\text{Average value}}}}$$ is the correct answer to “Form Factor is the ratio of”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

r.m.s. value to average value is the correct answer to “The form factor is the ratio of”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

220 V is the correct answer to “In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

50 Hz is the correct answer to “The period of a sine wave is ___________ seconds. Its frequency is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Rises to 63.2% of its final steady value is the correct answer to “The time constant of the capacitance circuit is defined as the time during which voltage”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

r.m.s. value is equal to average value is the correct answer to “The square waveform of current has following relation between r.m.s. value and average value.”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

0.707 of peak value is the correct answer to “The r.m.s. value of pure cosine function is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

VC and VL is the correct answer to “The phosphors for which of the following pair are 180° out of phase for VL, VC and VR”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

282.8 V is the correct answer to “The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

High power factor is the correct answer to “In an AC. circuit, a low value of kVAR compared with kW indicates”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

A sinusoid of the same frequency is the correct answer to “If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

42.42 sin 314 t is the correct answer to “If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

6 kVAR is the correct answer to “The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

90° is the correct answer to “What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Parallel is the correct answer to “Power factor of an inductive circuit is usually improved by connecting capacitor to it in”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

L or C is the correct answer to “In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Capacitance is the correct answer to “Which of the following circuit component opposes the change in the circuit voltage”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Half wave rectified sine wave is the correct answer to “For the same peak value, which of the following wave has the least mean value”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

No where is the correct answer to “In a sine wave the slope is constant”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Square wave is the correct answer to “For the same peak value which of the following wave will 'have the highest r.m.s. value”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

All above are correct is the correct answer to “In a R-L-C circuit”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Resistance is the correct answer to “Power factor of the following circuit will be unity”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

r.m.s. value is the correct answer to “The voltage of domestic supply is 220 V. This figure represents”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Have a high impedance is the correct answer to “A parallel AC. circuit in resonance will”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

127.4 V is the correct answer to “The peak value of a sine wave is 200 V. Its average value is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

True power is the correct answer to “The product of apparent power and cosine of the phase angle between circuit voltage and current is”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Half wave rectified sine wave is the correct answer to “Which of the following waves has the highest value of peak factor”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Actual power is zero is the correct answer to “In a purely inductive circuit”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Applied voltage decreases but current increases is the correct answer to “Pure inductive circuit takes power from the A.C. line when”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

10 is the correct answer to “The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohms. If frequency is increased to 100 Hz, reactance becomes __________ ohms.”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

63% of maximum value is the correct answer to “Time constant of a circuit is the time in seconds taken after the application of voltage to each”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

Depends upon the magnitude of R is the correct answer to “Magnitude of current at resonance in R-L-C circuit”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.

All of above is the correct answer to “Inductance of a coil Varies”. This question is standard in competitive examination syllabi for A_C Fundamentals_ Circuits And Circuit Theory.