GURUKUL FOUNDATION
JEE I NEET I CET
D-431, First Floor, Vishwa Apt, Ashok Stambh Circle, Nashik
___________________________________________
Simple AC Circuits DPP-04
1) A resistance of 300 Ω and an inductance of (1/π) henry are connected in series to a ac
voltage of 20 volts and 200 Hz frequency. The phase angle between the voltage and current
is
A. tan−1 4⁄3 B. tan−1 3⁄4 C. tan−1 3⁄2 D. tan−1 2⁄5
2) A 12 ohm resistor and a 0.21 henry inductor are connected in series to an A C source
operating at 20volts, 50 cycle/second. The phase angle between the current and the source
voltage is_____
A. 300 B. 400 C. 800 D. 900
3) The resistance that must be connected in series with inductance of 0.2 H in order that the phase
difference between current and e.m.f. may be 45° when the frequency is 50 Hz, is___
A. 6.28 ohm B. 62.8 ohm C. 628 ohm D. 31.4 ohm.
4) Alternating current is flowing in inductance L and resistance R. The frequency of source is ω/2π. Which
of the following statement in correct___
A) For low frequency the limiting value of impedance is L.
B) For high frequency the limiting value of impedance is ωL.
C) For high frequency the limiting value of impedance is R.
D) For low frequency the limiting value of impedance is ωL.
5) A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is
increased, while keeping the voltage of the source constant, then
A) Bulb will give more intense light B) Bulb will give less intense light.
C) Bulb will give light of same intensity as before D) Bulb will stop radiating light.
6) A capacitor has capacity C and reactance X. If capacitance and frequency become double,
then reactance will be______
A. 2𝑥 B. 4𝑥 C. 𝑥/2 D. 𝑥/4
7) Reactance of an inductor of 1⁄𝜋 henry at 50 𝐻𝑧 frequency is______
A. 50⁄𝜋 Ω B. 𝜋⁄50 Ω C. 100 Ω D. 50 Ω
8) There is a 5 Ω resistance in an ac, circuit. Inductance of 0.1 H is connected with it in series. If
equation of A C emf is 5 sin (50t) then the phase difference between current and e.m.f. is A.
𝜋⁄ B. 𝜋⁄6 C. 𝜋⁄4 D. 0
2
Prof. Vikas Patil (+91 8087182036 I 9767200022)
GURUKUL FOUNDATION
JEE I NEET I CET
D-431, First Floor, Vishwa Apt, Ashok Stambh Circle, Nashik
___________________________________________
9) A 50 Hz a.c. source of 20 volts is connected across R and C as shown in figure. The voltage
across R is 12 volt. The voltage across C is_____
A) 8 V B) 16 V C) 10 V
D) not possible to determine unless values of R and C are given.
10) If alternating current of 60 Hz frequency is flowing through inductance of L=1 mH and drop in
Δ𝑉𝐿 is 0.6 V then alternating current____
A. 1⁄2 B. 5⁄6 C. 50⁄𝜋 D. 20⁄𝜋
Answer key
Question 1 2 3 4 5 6 7 8 9 10
Answer A C B B A C C C B B
Prof. Vikas Patil (+91 8087182036 I 9767200022)
