# SET-I

1. (a) Derive the expressions for acceleration, Velocity and displacement of a charged particle placed in an electric field E.
(b) Two parallel plates of a capacitor are separated by 4 cms. An electron is at rest initally at the bottom plate. Voltage is applied between the plates, which increases linearly from 0V to 8V in 0.1 m.sec. If the top plate is +ve, determine:
i. The speed of electron in 40 n sec
ii. The distance traversed by the electron in 40 n sec.
2. (a) What are the various applications of p-n junction diode? Explain them.
(b) What are the specifications of p-n junction diode? Explain how reverse saturation current varies with temperature both in Si and

Ge diodes.
(c) Explain about the characteristics of zener diode.
3. (a) A 15-0-15 Volts (rms) ideal transformer is used with a full wave rectifier circuit with diodes having forward drop of 1 volt. The load is a resistance of 100ohm and a capacitor of 10,000μf is used as a filter across the load resistance. Calculate the dc load current and voltage.
(b) Explain the working of the Half wave rectifier circuit with neat sketch of waveforms at various points in the circuit.
4. (a) A transistor operating in CB configuration has IC = 2.98 mA, IE = 3.00mA and ICO=0.01 mA what current will flow in the collector circuit of this transistor when connected in CE configuration with a base current of 30 μA.
(b) The reverse saturation current in a transistor is 8μA. If the transistor common base current gain is 0.979, calculate the collector and emitter current for 40 μA base current.