MEDIUM
NEET
IMPORTANT
Earn 100

Obtain the maximum current and phase angle for a high frequency ac supply 110 V, 12 kHz. Discuss the result obtained. Consider series AC circuit with R=40 Ω and XC=17.53Ω, XL=0

Important Questions on Alternating Current

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NEET
IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 42
A 20 V-5 W lamp is to run on 220 V-50 Hz ac mains. Find the capacitance of a capacitor required to run the lamp.
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IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 43
A capacitor, a 15 Ω resistor and a 80 mH inductor are in series with a 50 Hz ac source. Calculate the capacitance if the current is in phase with the voltage.
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 44
A series LC circuit has L=0.405 H and C=25μF. The resistance R is zero. Find the frequency of resonance.
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 45
How much current is drawn by the primary of a transformer which steps down 220 V to 22 V to operate a device having an impedance of 220 Ω?
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IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 46
What is an alternating current (AC)?
Show that the average value of AC over a complete cycle is zero while for a half-cycle it is 2I0/π, where I0 is the peak value of the current.
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IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 47
What do you mean by root mean square value of ac. How is it related to peak value of current?
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IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 48
In an alternating-current circuit an inductance L, a capacitance C and a resistance R are connected in series. Derive expression for the impedance and the phase angle. What is the impedance at resonance?
HARD
NEET
IMPORTANT
Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>Assignment Set-1>Q 49
Explain the principle, construction and working of a choke coil in controlling current in an AC circuit. Why is it preferred to resistance in AC circuits?