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236 matching questions

Question #257Basic Electricity and Electronics

3 resistors of 2,3 & 4 ohms are connected in series. The voltage across the circuit is 9 V , the current drawn by 3 ohms resistor is

  1. 1.5 Amps
  2. 27 Amps
  3. 1 Amp ✓ Correct answer
  4. 3 Amps

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Question #261Basic Electricity and Electronics

The core of power supply transformer is laminated to

  1. decrease impedance
  2. increase impedance
  3. decrease eddy current losses ✓ Correct answer
  4. none of these

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Question #262Basic Electricity and Electronics

In a resonant circuit

  1. Xl = Xc ✓ Correct answer
  2. Xl > Xc
  3. Xl < Xc
  4. none of these
Explanation: At series resonance, inductive reactance equals capacitive reactance (XL = XC).

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Question #264Basic Electricity and Electronics

The phase relationship between the input and output of a common emitter circuit in degrees is

  1. 90
  2. 180
  3. 270
  4. 0 ✓ Correct answer

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Question #270Basic Electricity and Electronics

What safety feature does a power-supply bleeder resistor provide?

  1. It acts as a fuse for excess voltage
  2. It discharges the filter capacitors ✓ Correct answer
  3. It removes shock hazards from the induction coils
  4. It eliminates ground-loop current

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Question #272Basic Electricity and Electronics

What should be the minimum peak-inverse-voltage rating of the rectifier in a full-wave power supply?

  1. One-quarter the normal output voltage of the power supply
  2. Half the normal output voltage of the power supply
  3. Double the normal peak output voltage of the power supply ✓ Correct answer
  4. Equal to the normal output voltage of the power supply

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Question #273Basic Electricity and Electronics

What should be the approximate minimum peak-inverse-voltage rating of the rectifier in a half-wave power supply?

  1. One-half the normal peak output voltage of the power supply
  2. Half the normal output voltage of the power supply
  3. Equal to the normal output voltage of the power supply
  4. Two times the normal peak output voltage of the power supply ✓ Correct answer

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Question #277Basic Electricity and Electronics

What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?

  1. Product detector
  2. Phase inverter
  3. Mixer
  4. Discriminator ✓ Correct answer

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Question #278Basic Electricity and Electronics

What portion of the AC cycle is converted to DC by a half-wave rectifier?

  1. 90 degrees
  2. 180 degrees ✓ Correct answer
  3. 270 degrees
  4. 360 degrees

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Question #279Basic Electricity and Electronics

What portion of the AC cycle is converted to DC by a full-wave rectifier?

  1. 90 degrees
  2. 180 degrees
  3. 270 degrees
  4. 360 degrees ✓ Correct answer

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Question #280Basic Electricity and Electronics

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

  1. A series of DC pulses at twice the frequency of the AC input ✓ Correct answer
  2. A series of DC pulses at the same frequency as the AC input
  3. A sine wave at half the frequency of the AC input
  4. A steady DC voltage

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Question #286Basic Electricity and Electronics

A voltage will influence current only if the circuit is:

  1. open
  2. insulated
  3. high resistance
  4. closed ✓ Correct answer

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Question #290Basic Electricity and Electronics

The color band on the right side of a color coded resistor represents

  1. First digit
  2. Decimal multiplier
  3. Percentage tolerance ✓ Correct answer
  4. rating

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Question #292Basic Electricity and Electronics

If the current in a circuit equals 0 A, it is likely that the

  1. voltage is too high
  2. resistance is too low
  3. circuit has a short
  4. circuit is open ✓ Correct answer

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Question #297Basic Electricity and Electronics

Kirchoff_’s current law is applicable only to

  1. Electronic circuits
  2. Junction in a network ✓ Correct answer
  3. electric circuits
  4. None of these

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Question #300Basic Electricity and Electronics

When a portable radio is playing, the current in the radio is 0.3 A. If the resistance of the radio is 30.0 Ohm, what is the voltage supplied by the radio battery?

  1. 12 V
  2. 9 V ✓ Correct answer
  3. 6 V
  4. 15 V

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Question #301Basic Electricity and Electronics

_______ is a measure of the amount of electrical energy transferred by an electric charge as it moves from one point to another in a circuit.

  1. Current ✓ Correct answer
  2. Charge
  3. Electric circuit
  4. Voltage

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Question #302Basic Electricity and Electronics

A(n) _______ is made of a current-carrying wire wrapped around an iron core.

  1. electric current
  2. insulator
  3. conductor
  4. electromagnet ✓ Correct answer

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Question #305Basic Electricity and Electronics

The maximum efficiency of a half-wave rectifier is

  1. 60%
  2. 66.7%
  3. 40.6% ✓ Correct answer
  4. 84.12%

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Question #309Basic Electricity and Electronics

The ripple factor of a full wave rectifier without filter is

  1. 1.11
  2. 0.482 ✓ Correct answer
  3. 0.67
  4. 0.157

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