Preparing for the Joint Entrance Exam (JEE) can be a daunting task. With so many subjects to cover and so many topics to study, it can be challenging to know where to start. One essential topic in the JEE Mains syllabus is the Alternating Current. In this article, we will provide 50+ MCQ questions on the Alternating Current, along with detailed solutions to help you prepare for the JEE Mains exam.
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These 50+ MCQ questions are selected by the experts of studyrate.in and these are more difficult questions, which will help you to better understand Alternating Current JEE Mains MCQ Questions with Answers.
Alternating Current JEE Mains MCQ
In an AC circuit, the current and voltage are given by:
A) I = I0 cos(ωt) and V = V0 cos(ωt)
B) I = I0 sin(ωt) and V = V0 sin(ωt)
C) I = I0 sin(ωt) and V = V0 cos(ωt)
D) I = I0 cos(ωt) and V = V0 sin(ωt)
The peak voltage of an AC source is 220 V. The rms voltage of the source is approximately:
A) 154 V
B) 220 V
C) 311 V
D) 440 V
The peak-to-peak voltage of an AC source is 400 V. The rms voltage of the source is approximately:
A) 100 V
B) 200 V
C) 283 V
D) 400 V
The time period of an AC waveform is the time taken to complete:
A) One complete cycle
B) Half a cycle
C) One-fourth of a cycle
D) One-tenth of a cycle
The frequency of an AC waveform is given by:
A) 1/T
B) 1/f
C) T/f
D) f/T
The angular frequency (ω) of an AC waveform is related to the frequency (f) by the equation:
A) ω = 2πf
B) ω = πf
C) ω = f/2π
D) ω = f/π
The peak current in an AC circuit is 5 A. The rms current in the circuit is approximately:
A) 3.54 A
B) 5 A
C) 7.07 A
D) 10 A
The reactance of a capacitor in an AC circuit is given by:
A) Xc = 1/(2πfC)
B) Xc = 2πfC
C) Xc = 1/(2πCF)
D) Xc = 2πCF
The reactance of an inductor in an AC circuit is given by:
A) XL = 2πfL
B) XL = 1/(2πfL)
C) XL = 2πL/f
D) XL = 1/(2πL/f)
The impedance (Z) of an AC circuit containing resistance (R), inductance (L), and capacitance (C) is given by:
A) Z = R + XL + Xc
B) Z = R – XL + Xc
C) Z = R + XL – Xc
D) Z = R – XL – Xc
In an AC circuit, the power factor is defined as the ratio of:
A) Real power to reactive power
B) Apparent power to reactive power
C) Real power to apparent power
D) Reactive power to real power
The power factor of an AC circuit can range from:
A) -1 to 1
B) 0 to 1
C) 0 to -1
D) 1 to ∞
A purely resistive AC circuit has a power factor of:
A) 0
B) 1
C) -1
D) None of the above
A purely inductive AC circuit has a power factor of:
A) 0
B) 1
C) -1
D) None of the above
A purely capacitive AC circuit has a power factor of:
A) 0
B) 1
C) -1
D) None of the above
The average power dissipated in a purely resistive AC circuit is given by:
A) P = Vrms × Irms
B) P = Vpeak × Ipeak
C) P = Vrms × Ipeak
D) P = Vpeak × Irms
The phase difference between the current and voltage in a purely resistive AC circuit is:
A) 0 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees
The phase difference between the current and voltage in a purely inductive AC circuit is:
A) 0 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees
The phase difference between the current and voltage in a purely capacitive AC circuit is:
A) 0 degrees
B) 45 degrees
C) 90 degrees
D) 180 degrees
The power consumed by an AC circuit is measured in:
A) Watts (W)
B) Volts (V)
C) Amperes (A)
D) Ohms (Ω)
The power consumed by an AC circuit is also known as:
A) Real power
B) Reactive power
C) Apparent power
D) Power factor
The unit of apparent power in an AC circuit is:
A) Watts (W)
B) Volts (V)
C) Amperes (A)
D) Volt-amperes (VA)
The unit of reactive power in an AC circuit is:
A) Watts (W)
B) Volts (V)
C) Amperes (A)
D) Volt-amperes reactive (VAR)
The unit of power factor in an AC circuit is:
A) Watts (W)
B) Volts (V)
C) Amperes (A)
D) Dimensionless
The power factor can be improved by:
A) Adding a capacitor in parallel
B) Adding an inductor in series
C) Adding a resistor in parallel
D) Adding a transformer
The device used to measure the power factor in an AC circuit is called a:
A) Voltmeter
B) Ammeter
C) Power factor meter
D) Oscilloscope
The device used to measure the phase difference between the current and voltage in an AC circuit is called a:
A) Voltmeter
B) Ammeter
C) Power factor meter
D) Phase meter
The inductive reactance in an AC circuit increases with:
A) Increasing frequency
B) Decreasing frequency
C) Increasing inductance
D) Decreasing inductance
The capacitive reactance in an AC circuit increases with:
A) Increasing frequency
B) Decreasing frequency
C) Increasing capacitance
D) Decreasing capacitance
The impedance of an AC circuit containing only a resistor is equal to:
A) The resistance
B) The reactance
C) The resistance divided by the reactance
D) The reactance divided by the resistance
We hope there JEE MCQ of Class 12 Alternating Current will help you to score an excellent rank in JEE Mains and Advanced. If you have any queries feel free to write in the comments section. We at Study Rate are always ready to serve our students.
