The branch of engineering which deals with the generation, transmission, and distribution of electrical power. It also involves the design and construction of electronic components which utilize electricity.


A 20 ohm, 1/4 watt resistor connects to a 12 Volt source. Which of the following statements is correct:

  1. A current of 0.6 Amps will flow through resistor
  2. A current of 0.02 Amps will flow
  3. The resistor will burn away
  4. 240 Amps will flow

Correct answer: 3. The resistor will burn away

A 12 volt source causes a current flow of 0.6 in 20 ohms resistor. 0.6 Amps of current flow means a power of 7.2 watts (P = VI = 12 * 0.6 = 7.2 watts) and this power is not bearable for the 1/4 W (0.25 watts) resistor and will cause it to burn.


For 400 Hz frequency, the time period is:

  1. 0.025 s
  2. 0.0025 s
  3. 200 s
  4. 400 s

Correct answer: 2. 0.0025 s

Time period = 1/f = 1/400 Hz = 0.0025 s


Transformer short circuit test is performed to find:

  1. Iron losses
  2. Copper losses
  3. Both of these
  4. None of these

Correct answer: 2. Copper losses


The power factor of series RLC circuit at resonance is:

  1. 0.5
  2. 0.8
  3. 0.9
  4. Unity
  5. Zero

Correct answer: 4. Unity


The RMS value of a Sin wave having peak value 282 is:

  1. 100
  2. 200
  3. 222
  4. 300

Correct answer: 2. 200

For Sin wave RMS = 0.707*Peak = 200


In a delta connected system:

  1. Phase voltage = √ 3 * Line voltage
  2. √ 3 * Phase voltage = Line Voltage
  3. Phase voltage = Line voltage
  4. None of these

Correct answer: 3. Phase voltage = Line voltage


Which one of the following cases has highest capacitive reactance:

  1. High capacitance and High frequency
  2. High capacitance but low frequency
  3. Low capacitance and Low frequency
  4. Low capacitance but high frequency

Correct answer: 3. Low capacitance and Low frequency


Ammeter connects in:

  1. Series
  2. Parallel
  3. Both

Correct answer: 1. Series


The function of filter in DC Power supply is to:

  1. Convert AC to DC
  2. Convert AC to pulsating DC
  3. Remove ripples from pulsating DC
  4. Maintain a constant voltage despite of changes in input

Correct answer: 3. Remove ripples from pulsating DC


Which one the following is known as universal gate:

  1. NAND
  2. AND
  3. OR
  4. NOT

Correct answer: 1. NAND

NAND and NOR gates are known as universal gates. Using these two gates any logic system can be implemented.