Part – A

 Define Electro Magnetism.
 Name two good conductors, two good insulators and two semi conductors.
 Give the definition of short circuit and open circuit
 Give two precautions to be observed while using a ohm meter.
 What is the function of commutator in a D.C. Machine?
 For a peak value of 100v the r.m.s value is ______.
 Write the truth table for two input AND gate.
 A digital circuit that can hold or store digital data is ______.
 Energy stored in Inductance is given as ______.
 A small light bulb with a resistance of 2400Ω is connected across the 120V power line. The current I is ______.
 The capacitive reactance is ______.
Part – B
Unit I

 State the three forms of ohms law relating to V, I and R.
 Derive P = I^{2R} from P = IV by using an ohms – law finale.

 Give any five difference of DC voltage and AC voltage.
 State three rules for current voltage and resistance in a series circuit
 Draw the wiring diagram showing three resistance connected in parallel across battery.
Unit II

 Why is a voltmeter connected in parallel in a circuit why if should have high resistance?
 Explain Loading effect of voltmeter. And how it is corrected.

 Define temperature coefficient of resistance.
 Explain the principle and operation of a moving coil ammeter a neat sketch.
Unit III

 With neat sketch explain the construction of the leadacid cells. Indicate the negative the negative and positive electrodes and the electrolyte.
 List the types of chemical cells giving two features of each.

 Define the following terms for a sine wave:
 Peak
 Peak to peak
 root – mean – square
 Average
 Frequency
 A sine wave of voltage varies form 0 to maximum of 100v. How much is the voltage at the instant of 30°, 45°, 90° and 270° of the cycle?
Unit IV

 Define harmonic frequencies giving numerical values .
 What is meant by Dielectric material? Name five common dielectric materials

 How much is the X_{C} of a 47 p.f. value of C at:
 1 MHZ
 10 MHZ
 List the physical factor affecting the inductance of an inductor.
 How much is the inductance and a coil that induces 1000v when in current changes at the rate of 50ms in 2μs.
Unit V

 Define Modulation.
 Compare the terms voltage gain and current gain.
 Give two methods of Calculating the gain for amplifiers in cascade.

 What is meant by a rectifier? Give three examples of diode rectifiers?
 Describe the operation of:
 RS flip flops
 Dtype flip flops
 JK flip flops
 Explain what is meant by the toggle mode of JK flip flop.
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