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236 matching questions

Question #340Basic Electricity and Electronics

DC voltage ____

  1. rises and falls
  2. is a sine wave
  3. remains constant ✓ Correct answer
  4. is an audio waveform

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Question #344Basic Electricity and Electronics

Find the equivalent resistance of 2 No's 10K resistor in parallel

  1. 5k ✓ Correct answer
  2. 10K
  3. 15K
  4. 20K

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Question #345Basic Electricity and Electronics

Find the equivalent capacitance of 3 No's 10pf capacitor in parallel

  1. 10pf
  2. 20pf
  3. 30pf ✓ Correct answer
  4. 15pf

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Question #346Basic Electricity and Electronics

Which type resistor cannot be used in RF circuits

  1. Carbon film
  2. Metal film
  3. Wire wound ✓ Correct answer
  4. None of the above

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Question #347Basic Electricity and Electronics

The tendency of AC current flowing through a surface of a solid conductor

  1. Proximity effect
  2. skin effect ✓ Correct answer
  3. radiation effect
  4. None of the above

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Question #348Basic Electricity and Electronics

The resistance of a 100 W, 200 V lamp is

  1. 100 ohm
  2. 200 ohm
  3. 400 ohm ✓ Correct answer
  4. 1600 ohm.

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Question #349Basic Electricity and Electronics

The instrument used for measuring electric current is :

  1. ammeter ✓ Correct answer
  2. galvanometer
  3. voltmeter
  4. potentiometer

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Question #352Basic Electricity and Electronics

A transformer which is 80% efficient gives an output of 12V and 4A. What is the input power?

  1. 13W
  2. 38W ✓ Correct answer
  3. 60W
  4. 154W

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Question #353Basic Electricity and Electronics

Why is electrical energy usually transmitted at high voltage?

  1. the resistance of the transmission cables is as small as possible
  2. the transmission cables are safer to handle
  3. as little energy as possible is wasted in the transmission cables ✓ Correct answer
  4. the transmission system does not require transformers e) the current in the transmission cables is as large as possible

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Question #354Basic Electricity and Electronics

The potential difference required to pass a current 0.2 A in a wire of resistance 20W is ____.

  1. 100 V ✓ Correct answer
  2. 4 V
  3. .01 V
  4. 40 V

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Question #355Basic Electricity and Electronics

The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________.

  1. current
  2. potential difference ✓ Correct answer
  3. resistance
  4. power

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Question #356Basic Electricity and Electronics

When there is an electric current passing through a wire, the particles moving are __

  1. electrons ✓ Correct answer
  2. protons
  3. atoms
  4. ions

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Question #361Basic Electricity and Electronics

What is the color code for a 220ohm 5% resistor?

  1. Red, Red, Brown, Gold ✓ Correct answer
  2. Orange, Orange, Black, Gold
  3. Red, Red, Black, Gold
  4. Red, Red, Brown, Silver

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Question #363Basic Electricity and Electronics

The quality factor of R-L-C circuit will increase if

  1. R increases ✓ Correct answer
  2. R decreases
  3. Impedance increases
  4. voltage increases

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Question #365Basic Electricity and Electronics

A basic electric circuit is made up of what components?

  1. A load, a resistor, and a conductive path for current
  2. A voltage source, a load, and a conductive path for current ✓ Correct answer
  3. A voltage source, a conductive path for current, and a battery
  4. A conductive path for current, a battery, and a copper wire

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Question #367Basic Electricity and Electronics

If an electrical system is compared to a fluid system, the electrical current corresponds to the:

  1. pressure
  2. pump
  3. water wheel
  4. water flow ✓ Correct answer

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Question #369Basic Electricity and Electronics

Kirchhoff's current law for parallel circuits states that the:

  1. sum of all branch voltages equals zero
  2. total circuit resistance is less than the smallest branch resistor
  3. sum of currents into a junction is equal to the difference of all the branch currents.
  4. sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction ✓ Correct answer

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Question #370Basic Electricity and Electronics

What is the total resistance of four 1 k parallel-connected resistors?

  1. 200 ohms
  2. 250 ohms ✓ Correct answer
  3. 400 ohms
  4. 4 kilo ohms

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Question #371Basic Electricity and Electronics

What is the total opposition to current in a series RC circuit called?

  1. impedance ✓ Correct answer
  2. inductance
  3. reactance
  4. resistance

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Question #372Basic Electricity and Electronics

A capacitor is constructed of two parallel:

  1. conductors ✓ Correct answer
  2. semiconductors
  3. inductors
  4. dielectrics

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