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236 matching questions

Question #47Basic Electricity and Electronics

The following is used as a Voltage smoothing device

  1. Resistor
  2. Capacitor ✓ Correct answer
  3. Inductor
  4. Both a and b
Explanation: A capacitor is commonly used to smooth rectified DC.

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Question #158Basic Electricity and Electronics

What is the name of a current that flows only in one direction?

  1. An alternating current
  2. A direct current
  3. A normal current ✓ Correct answer
  4. A smooth current

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Question #160Basic Electricity and Electronics

How much voltage does an automobile battery usually supply?

  1. About 12 volts ✓ Correct answer
  2. About 30 volts
  3. About 120 volts
  4. About 240 volts

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Question #161Basic Electricity and Electronics

What is the name of a current that reverses direction on a regular basis?

  1. An alternating current
  2. A direct current ✓ Correct answer
  3. A circular current
  4. A vertical current

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Question #162Basic Electricity and Electronics

What is the term used to describe opposition to current flow in ordinary conductors such as wires?

  1. Inductance
  2. Resistance ✓ Correct answer
  3. Counter EMF
  4. Magnetism

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Question #163Basic Electricity and Electronics

What instrument is used to measure the flow of current in an electrical circuit?

  1. Frequency meter
  2. SWR meter
  3. Ammeter ✓ Correct answer
  4. Voltmeter

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Question #166Basic Electricity and Electronics

What term describes the number of times that an alternating current flows back and forth per second?

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

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Question #178Basic Electricity and Electronics

What device is used to convert the alternating current from a wall outlet into low-voltage direct current?

  1. Inverter
  2. Compressor
  3. Power Supply ✓ Correct answer
  4. Demodulator

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Question #179Basic Electricity and Electronics

What device is used to increase the output of a 10 watt radio to 100 watts?

  1. Amplifier ✓ Correct answer
  2. Power supply
  3. Antenna
  4. Attenuator

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Question #181Basic Electricity and Electronics

What is the nominal voltage per cell of a fully charged nickel-cadmium battery?

  1. 1.0 volts
  2. 1.2 volts ✓ Correct answer
  3. 1.5 volts
  4. 2.2 volts

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Question #185Basic Electricity and Electronics

What formula is used to calculate current in a circuit?

  1. Current (I) equals voltage (E) multiplied by resistance (R)
  2. Current (I) equals voltage (E) divided by resistance (R) [I=E/R Ohm's Law] ✓ Correct answer
  3. Current (I) equals voltage (E) added to resistance (R)
  4. Current (I) equals voltage (E) minus resistance (R)
Explanation: Ohm’s law rearranged for current is I = E/R.

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Question #186Basic Electricity and Electronics

What formula is used to calculate voltage in a circuit?

  1. Voltage (E) equals current (I) multiplied by resistance (R) [E=I*R Ohm's Law] ✓ Correct answer
  2. Voltage (E) equals current (I) divided by resistance (R)
  3. Voltage (E) equals current (I) added to resistance (R)
  4. Voltage (E) equals current (I) minus resistance (R)
Explanation: Ohm’s law rearranged for voltage is E = I × R.

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Question #187Basic Electricity and Electronics

What formula is used to calculate resistance in a circuit?

  1. Resistance (R) equals voltage (E) multiplied by current (I)
  2. Resistance (R) equals voltage (E) divided by current (I) [R=E/I Ohm's Law] ✓ Correct answer
  3. Resistance (R) equals voltage (E) added to current (I)
  4. Resistance (R) equals voltage (E) minus current (I)
Explanation: Ohm’s law rearranged for resistance is R = E/I; multiplying voltage by current gives power, not resistance.

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Question #188Basic Electricity and Electronics

What is the resistance of a circuit when a current of 3 amperes flows through a resistor connected to 90 volts?

  1. 3 ohms
  2. 30 ohms (As per ohm's law R=E/I, Thus R = 90 Volts / 3 Ampere) ✓ Correct answer
  3. 93 ohms
  4. 270 ohms

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Question #189Basic Electricity and Electronics

What is the resistance in a circuit where the applied voltage is 12 volts and the current flow is 1.5 amperes?

  1. 18 ohms
  2. 0.125 ohms
  3. 8 ohms ✓ Correct answer
  4. 13.5 ohms

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Question #190Basic Electricity and Electronics

What is the current flow in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms?

  1. 9600 amperes
  2. 200 amperes
  3. 0.667 amperes
  4. 1.5 amperes ✓ Correct answer

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Question #191Basic Electricity and Electronics

What is the voltage across the resistor if a current of 0.5 amperes flows through a 2 ohm resistor?

  1. 1 volt ✓ Correct answer
  2. 0.25 volts
  3. 2.5 volts
  4. 1.5 volts

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Question #192Basic Electricity and Electronics

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

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

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Question #193Basic Electricity and Electronics

What is the voltage across the resistor if a current of 2 amperes flows through a 10 ohm resistor?

  1. 20 volts ✓ Correct answer
  2. 0.2 volts
  3. 12 volts
  4. 8 volts

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Question #194Basic Electricity and Electronics

What is the current flowing through a 100 ohm resistor connected across 200 volts?

  1. 20,000 amperes
  2. 0.5 amperes
  3. 2 amperes ✓ Correct answer
  4. 100 amperes

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