Electrical & Electronics Engineering – December 2011

Part – A

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

Part – B

Unit -I

    1. State the three forms of ohms law relating to V, I and R.
    2. Derive P = I2R from P = IV by using an ohms – law finale.
    1. Give any five difference of DC voltage and AC voltage.
    2. State three rules for current voltage and resistance in a series circuit
    3. Draw the wiring diagram showing three resistance connected in parallel across battery.
      Electrical & Electronics Engineering – December 2011 - Q6-b

Unit -II

    1. Why is a voltmeter connected in parallel in a circuit why if should have high resistance?
    2. Explain Loading effect of voltmeter. And how it is corrected.
    1. Define temperature coefficient of resistance.
    2. Explain the principle and operation of a moving coil ammeter a neat sketch.

Unit -III

    1. With neat sketch explain the construction of the lead-acid cells. Indicate the negative the negative and positive electrodes and the electrolyte.
    2. List the types of chemical cells giving two features of each.
    1. Define the following terms for a sine wave:
      1. Peak
      2. Peak to peak
      3. root – mean – square
      4. Average
      5. Frequency
    2. 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

    1. Define harmonic frequencies giving numerical values .
    2. What is meant by Dielectric material? Name five common dielectric materials
    1. How much is the XC of a 47 p.f. value of C at:
      1. 1 MHZ
      2. 10 MHZ
    2. List the physical factor affecting the inductance of an inductor.
    3. How much is the inductance and a coil that induces 1000v when in current changes at the rate of 50ms in 2μs.

Unit -V

    1. Define Modulation.
    2. Compare the terms voltage gain and current gain.
    3. Give two methods of Calculating the gain for amplifiers in cascade.
    1. What is meant by a rectifier? Give three examples of diode rectifiers?
    2. Describe the operation of:
      1. RS flip flops
      2. D-type flip flops
      3. JK flip flops
    3. Explain what is meant by the toggle mode of JK flip flop.

Attention : This exam questions are converted from the real exam paper to a digital text format by using an OCR Software that may made some mistakes, I reviewed it many times to correct it, But may still there some errors that I missed or misspelled, So if you detect an error or mistake PLEASE report by adding a comment or contact me.