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236 matching questions

Question #398Basic Electricity and Electronics

The impedance of a resonant circuit is

  1. Zero
  2. Equal to resistance ✓ Correct answer
  3. Unity
  4. Equal to reactance 200.A Diode can be used as

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Question #405Basic Electricity and Electronics

The 'RMS value' of a sine-wave signal is:

  1. half the peak voltage
  2. 1.414 times the peak voltage
  3. the peak-to-peak voltage
  4. 0.707 times the peak voltage ✓ Correct answer
Explanation: For a sinusoidal signal, Vrms = Vpeak/√2 ≈ 0.707 Vpeak. The option text was cleaned of OCR spillover.

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Question #406Basic Electricity and Electronics

The colour bands of a 4.7KOhm 5% resistor are

  1. Yellow, Violet, Orange and Gold
  2. Yellow, Violet, Red and Gold ✓ Correct answer
  3. Yellow, Violet, Orange and Silver
  4. Yellow, Violet, Red and Silver

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Question #408Basic Electricity and Electronics

The power conversion efficiency of a Full-wave rectifier is

  1. 40.6%
  2. 51.2%
  3. 100%
  4. 81.2% ✓ Correct answer

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Question #411Basic Electricity and Electronics

The following material is considered to be a semiconductor:

  1. copper
  2. sulphur
  3. silicon ✓ Correct answer
  4. tantalum

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Question #412Basic Electricity and Electronics

The Transformers are rated in

  1. Watts
  2. Volts
  3. Amperes
  4. Volt-Amperes ✓ Correct answer
Explanation: Transformer ratings are expressed in volt-amperes (VA), not watts alone. The option text was cleaned of OCR spillover.

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Question #413Basic Electricity and Electronics

In an n-type semiconductor, the current carriers are:

  1. holes
  2. electrons ✓ Correct answer
  3. positive ions
  4. photons

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Question #416Basic Electricity and Electronics

Two basic types of bipolar transistors are:

  1. p-channel and n-channel types
  2. NPN and PNP types ✓ Correct answer
  3. diode and triode types
  4. Varicap and Zener types 226.A "linear amplifier" is:

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Question #420Basic Electricity and Electronics

The AGC circuit is to:

  1. expand the audio gain
  2. limit the extent of amplitude generation
  3. minimize the adjustments needed to the receiver gain control knobs ✓ Correct answer
  4. amplitude limits the crystal oscillator output

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Question #426Basic Electricity and Electronics

The AGC circuit in a receiver usually controls the:

  1. audio stage
  2. mixer stage ✓ Correct answer
  3. power supply
  4. RF and IF stages

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Question #430Basic Electricity and Electronics

The following unit in a DC power supply performs a smoothing operation:

  1. an electrolytic capacitor ✓ Correct answer
  2. a fuse
  3. a crowbar
  4. a full-wave diode bridge

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Question #500Basic Electricity and Electronics

What is the name of a device that combines several semiconductors and other components into one package?

  1. Transducer
  2. Multi-pole relay
  3. Integrated circuit ✓ Correct answer
  4. Transformer

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Question #502Basic Electricity and Electronics

What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it?

  1. 1 volt
  2. 10 volts ✓ Correct answer
  3. 11 volts
  4. 9 volts

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Question #503Basic Electricity and Electronics

Electrical current is measured in which of the following units?

  1. Volts
  2. Watts
  3. Ohms
  4. Amperes ✓ Correct answer

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Question #509Basic Electricity and Electronics

What is the peak-to-peak voltage of a sine wave that has an RMS voltage of 120 volts?

  1. 84.8 volts
  2. 169.7 volts
  3. 240.0 volts
  4. 339.4 volts ✓ Correct answer

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Question #510Basic Electricity and Electronics

What is the inductance of a 20 millihenry inductor in series with a 50 millihenry inductor?

  1. .07 millihenrys
  2. 14.3 millihenrys
  3. 70 millihenrys ✓ Correct answer
  4. 1000 millihenrys

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Question #511Basic Electricity and Electronics

What circuit is used to process signals from the RF amplifier and local oscillator and send the result to the IF filter in a super-heterodyne receiver?

  1. Balanced modulator
  2. IF amplifier
  3. Mixer ✓ Correct answer
  4. Detector

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Question #513Basic Electricity and Electronics

What is the resistance of a circuit in which a current of 3A through a Resistor connected to 90 volts?

  1. 3 ohms
  2. 30 ohms ✓ Correct answer
  3. 93 ohms
  4. 270 ohms

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Question #525Basic Electricity and Electronics

What term describes the number of times per second that an alternating current reverses direction?

  1. Pulse rate
  2. Speed ✓ Correct answer
  3. Wavelength
  4. Frequency

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Question #527Basic Electricity and Electronics

Which of the following is equivalent to 500 milliwatts?

  1. 0.02 watts
  2. 0.5 watts ✓ Correct answer
  3. 5 watts
  4. 50 watts

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