Understand the concepts of paper

1. ADVISER ACADEMY
2ND YEAR TEST SESSION TEST PHYSICS 4
1. Q 1: Answer the Questions.(Any 10) 20 Marks
I. What is meant by A.Mand F.M?
II. A sinusoidalcurrenthas rms valueof 10A. What is the maximum or peak value?
III. How does doubling the frequency affect the reactance of (a) an inductor (b) a
capacitor?
IV. How the reception of a particular radio station is selected on your radio set?
V. What is choke? What its main uses?
VI. Name the device that will a) permit flow of direct currentbut opposethe flow of
alternating current b) permit the flow of alternating current but not the direct
current.
VII. What is resonancecondition?
VIII. How many times per second will an incandescent lamp reach maximum brilliance
when connected to a 50 Hz source?
IX. Explain the condition under which electromagnetic waves areproduced for source?
X. A choke coil placed in series with an electric lamp in an A.C. circuit causes the lamp
become dim. Why is it so?
XI. What is impedance?
XII. What a 100 micro F capacitor is connected to an alternating voltage of 24 V and
frequency 50Hz. Calculate reactance of the capacitor.
XIII. What are the main elements of A.C circuit?
(Subjective Type)
2. Explain series resonancecircuit?
3. A 10mH, 20Ώ coilis connected across 240 V and 180/π Hz source. How much power
does it dissipate?
4. Explain R-C and R-L series circuits?
5. A circuit has an inductance of 1/π H and resistanceof 2000 Ώ. A 50 H A.C. supplied to
it calculate the reactance and impedance offered by the circuit.