Explain the function of conductor. In what forms is it used and where.

Calculate the resistance of a 400 W bulb connected across 230 volts power line.

What is the shunt resistance R_{s} needed to extend the range of 50Ω, 1-mA movement to 100 mA.

If a rms voltage of 120 V is applied across a 100 ohms resistor. What would be its rms current?

Show how two resistance A and B are connected in parallel across a battery

What is magnetic saturation

Calculate the capacitance of a capacitor with plate area of 50 cm^{2} and dielectric thickness of 0.5mm with air as dielectric

What is the peak to peak value of a sine wave whose rms value is 10 volts

Part – B

Unit -I

Describe frequency of an alternating voltage.

The conductance of a wire at 100°C is one tenth its value at 25°C. If the wire resistance equals 10 ohms at 25°C. Calculate the resistance of the wire at 100°C.

Explain the color coding for resistors. Also how the color coding determines the tolerance of resistor.

A 60 volts source is connected across a 30 kilo-ohm resistance:

Draw the schematic diagram

How much current flows through the resistance?

Give the color code of the resistance

Unit -II

Define voltmeter.

Explain the loading effect of the voltmeter.

Use the method of mesh currents to solve for IR_{1} , IR_{2} , IR_{3} , VR_{1} , VR_{2} and VR_{3} in the circuit given below:

Unit -III

Explain why the terminal voltage of a battery drops with more load current.

Explain the main parts of the electric motors.

Explain in brief lead-acid wet cell.

A6 volt lead-acid battery has an internal resistance of 0.01 Ohm. How much current will flow if the battery has a short circuit?

Unit -IV

Explainable magnetic field.

The flux density in an iron core is 0.5^{T} if the area of the core is 10 cm^{2}. Calculate the total number of flux lines in the core.

What is meant by a dielectric material? Name four common dielectric materials where it is used.

A microfarad capacitor C_{1} and a 10 microfarad capacitor C_{2} are in series with a constant 2 milli ampere charging current:

After 4 seconds, how much charge is in C_{1} and in C_{2}.

How much is the voltage across C_{1} and across C_{2}.

According to Kirchoffs voltage law, the algebraic sum of all – I.R. drops and e.m.fs. in a closed path is:

Positive

Negative

Zero

None of the above.

A fuse wire is made up of:

Tungsten

Tin coated zinc

Nickel

All of the above.

What are the important specifications of a resister?

What are the different types of capacitors available?

Thirty zinc-carbon dry cells each of 1.5 V are connected in series the total o/p voltage is ______

What is the difference between ideal current source and practical current source?

Draw the truth table of AND or Gate,

Draw the schematic of JK-flip-flop.

Part – B

Unit -I

State and explain Kirchoffs current law and voltage.

Explain the concept of open circuit and closed circuit.

Using Kirchoffs and Ohms law find the value of resistor R in the above

Three resistances are connected in:

Series

Parallel – obtain their equivalent resistances.

Unit -II

Obtain the current flowing through all the resistances and voltage drops across 2Ω, 4Ω and 6Ω resistor in the circuit shown below:

Explain the principle and operation of a moving coil ammeter with a neat sketch.

Unit -III

Describe the functioning of a lead – acid wet cell with a neat sketch.

Three coils each having a resistance of 30Ω and impedance of 50Ω are connected in delta across a 400 V, 50 Hz, 3 phase supply. Find:

The line current

The power factor

The active power absorbed.

Unit -IV

Two capacitors of 6μF and 9μF are connected in parallel, A 10μF capacitor is connected in series with this parallel combination. When the voltage applied is 100 V dc compare:

The total capacitance of the Ckt.

The voltage across each capacitor

The total charge in the circuit.

Unit -V

Draw the V-l characteristics of a P-h junction diode and explain the working when it is connected in:

forward bias and

reverse bias.

Explain the diagram, of N-channel FET and its volt-ampere characteristics and how it is different from bipolar junction transistor.

What kind of meter is used to measure the potential difference of a battery?

If a voltage of 10 volts produces a current of 2.5 amperes then what is the resistance in the circuit.

Explain the functions of multimeter.

Find the resistance of 1000 W bulb connected across a power line carrying 0.5 Amp of current.

Show how to connect two resistance A and B in series with each other across a voltage source.

Which type of cell can be recharged and give an example of a material with negative temperature coefficient.

Derive the value of total capacitance when two capacitance having values of 2μF and 3μf are connected in series.

Name two semi conductors. Give one application.

What is the characteristic of the charge on the proton and the electron and what is the function of a rectifier.

Part – B

Unit -I

Explain the difference between conventional current direction and electron flow direction.

An electric heater having a resistance of 25 Ohm is connected to 230 V mains supply through a cable having a total resistance of 0.2 Ohm. Calculate the power dissipated by heater power wasted in cable and total energy consumed in 2 hours.

Show the atomic structure of the element sodium (Na) with atomic number 11 What is its electron valance?

State the three forms of Ohm’s law relating V, I and R.

List the differences between a potentiometer and a rheostat.

Unit -II

Explain the construction and operation of a basic moving coil meter.

Draw a circuit with two bulbs, a battery and an SPDT switch that determines which bulb lights.

State and explain Kirchoff’s law.

Distinguish between a conductor and insulator. Give the examples of each and their applications.

Unit -III

Draw a sketch illustrating the construction of a carbon-zinc dry cell.

In the circuit of figure, with S_{1} in position, 1, V=50 Volts with S_{1} in position 2, V = 37.5 Volts. Calculate r_{1} .

Mention different types of cells.

Explain the voltaic coll.

Unit -IV

Explain how charge is stored in the dielectric of a capacitor.

Describe the working of transformer.

Explain the types of capacitors.

How much charge.is stored in a 2μf capacitor connected across a 50 V supply.

Unit -V

Give the applications of a diode.

Explain the PNP and NPN transistor.

Explain the analog and the digital signals with neat diagrams.