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236 matching questions

Question #4Basic Electricity and Electronics

Kirchhoff’s voltage Law states that

  1. The sum of voltages in a loop is zero
  2. The algebraic sum of voltages in a loop is zero ✓ Correct answer
  3. The sum of currents at a junction is zero
  4. The algebraic sum of currents at a junction is zero

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Question #7Basic Electricity and Electronics

The unit of resistance is

  1. Mho
  2. Volts
  3. Ampere
  4. Ohm ✓ Correct answer
Explanation: The SI unit of resistance is the ohm.

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Question #9Basic Electricity and Electronics

The three leads of a common transistor are

  1. Base Collector Case
  2. Emitter Collector Bias
  3. Collector Base Omitter
  4. Collector Base Emitter ✓ Correct answer
Explanation: A bipolar transistor has collector, base and emitter terminals.

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Question #10Basic Electricity and Electronics

If R is resistance, I is current and V is voltage, then Ohms law states that

  1. R=V/I ✓ Correct answer
  2. I=R/V
  3. V=R/I
  4. V/(R/I)=1
Explanation: Ohm’s law gives R = V/I.

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Question #11Basic Electricity and Electronics

If two capacitors are placed in series, is the final capacitance will be:

  1. Higher than the sum of the two capacitors
  2. Lower than the least of the two capacitors ✓ Correct answer
  3. The sum of the two capacitors
  4. Cannot be determined the given data.
Explanation: Series capacitance is less than the smallest individual capacitor.

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Question #12Basic Electricity and Electronics

Which is the unit of energy in electronics?

  1. Ohm
  2. Ampere
  3. Joules ✓ Correct answer
  4. Watt
Explanation: Energy is measured in joules.

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Question #15Basic Electricity and Electronics

The unit of current is

  1. Volts
  2. Ampere ✓ Correct answer
  3. Watt
  4. Hertz
Explanation: The SI unit of current is the ampere.

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Question #17Basic Electricity and Electronics

The equivalent capacitance when three capacitors of 150 micro farad are connected in series is

  1. 450 micro farad capacitor
  2. 300 micro farad capacitor
  3. 150 micro farad capacitor
  4. 50 micro farad capacitor ✓ Correct answer
Explanation: Three equal 150 µF capacitors in series give 150/3 = 50 µF.

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Question #18Basic Electricity and Electronics

A resistor with color bands: Red-Violet-Orange-Silver, has the value of

  1. 23 kilo Ohm , 5% tolerance
  2. 27 kilo Ohm , 5% tolerance
  3. 2.7 kilo Ohm , l0%tolerance
  4. 27 kilo Ohm , 10% tolerance ✓ Correct answer
Explanation: Red-violet-orange gives 27 kΩ; silver indicates ±10% tolerance.

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Question #19Basic Electricity and Electronics

The abbreviation of RMS voltage is

  1. Railway Mail Service voltage
  2. Real Mean Square voltage
  3. Root Mean Square voltage ✓ Correct answer
  4. Root Mean Service voltage
Explanation: RMS means Root Mean Square.

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Question #20Basic Electricity and Electronics

If the peak voltage of a sinusoidal ac supply is 150 volts, the RMS value is

  1. Less than peak value ✓ Correct answer
  2. More than peak value
  3. Equal to peak value
  4. Not related to peak value of the voltage
Explanation: For a sine wave, RMS voltage is 0.707 times peak voltage.

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Question #21Basic Electricity and Electronics

A capacitor and inductor in series is called a

  1. Tuned Circuit ✓ Correct answer
  2. Timing Circuit
  3. Delay Circuit
  4. Schmitt Circuit
Explanation: A capacitor and inductor form a tuned (resonant) circuit.

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Question #23Basic Electricity and Electronics

The current in a circuit is 25mA, then the equivalent value is

  1. 0.00025 Ampere
  2. 0.0025 Ampere
  3. 0.025 Ampere ✓ Correct answer
  4. 0.25 Ampere
Explanation: 25 mA = 0.025 A.

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Question #24Basic Electricity and Electronics

If 2 mA current flows through a 100 Kohm resistor, then the voltage across it is

  1. 2 volts
  2. 20 volts
  3. 200 volts ✓ Correct answer
  4. 0.2 volts
Explanation: V = IR = 0.002 A × 100,000 Ω = 200 V.

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Question #35Basic Electricity and Electronics

A diode can be used in the following stages of a radio receiver

  1. Detector
  2. Mixer
  3. Rectification
  4. All of the above ✓ Correct answer
Explanation: Diodes are used in detector, mixer and rectifier circuits.

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Question #38Basic Electricity and Electronics

A transformer converts

  1. AC voltage into DC voltage
  2. DC voltage into AC voltage
  3. AC voltage into different AC voltage ✓ Correct answer
  4. DC voltage into different DC voltage
Explanation: A transformer changes one AC voltage level to another AC voltage level.

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Question #39Basic Electricity and Electronics

A matching transformer (10:1 turns ratio) is used to match 200 ohms into ___ ohms.

  1. 2 ✓ Correct answer
  2. 20
  3. 200
  4. 5
Explanation: A 10:1 turns ratio gives a 100:1 impedance ratio; 200 Ω / 100 = 2 Ω.

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Question #40Basic Electricity and Electronics

The following are transformer losses

  1. Hysteresis losses
  2. Eddy current losses
  3. Copper losses
  4. All of the above ✓ Correct answer
Explanation: Transformer losses include copper, hysteresis and eddy-current losses.

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Question #44Basic Electricity and Electronics

The biasing of a transistor is to

  1. To avoid thermal run away
  2. To provide stable operation
  3. To have a stable quiescent point
  4. All of the above ✓ Correct answer
Explanation: Proper transistor biasing establishes a stable operating point and helps prevent thermal runaway.

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Question #46Basic Electricity and Electronics

A centre-tapped full-wave rectifier employs

  1. 1 diode
  2. 2 diodes ✓ Correct answer
  3. 3 diodes
  4. 4 diodes
Explanation: A centre-tapped full-wave rectifier uses two diodes. A bridge full-wave rectifier uses four.

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