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236 matching questions

Question #195Basic Electricity and Electronics

What is the current flowing through a 24 ohm resistor connected across 240 volts?

  1. 24,000 amperes
  2. 0.1 amperes
  3. 10 amperes ✓ Correct answer
  4. 216 amperes

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Question #196Basic Electricity and Electronics

What is the formula used to calculate electrical power in a DC circuit?

  1. Power (P) equals voltage (E) multiplied by current (I) ✓ Correct answer
  2. Power (P) equals voltage (E) divided by current (I)
  3. Power (P) equals voltage (E) minus current (I)
  4. Power (P) equals voltage (E) plus current (I)

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Question #197Basic Electricity and Electronics

How much power is represented by a voltage of 13.8 volts DC and a current of 10 amperes?

  1. 138 watts ✓ Correct answer
  2. 0.7 watts
  3. 23.8 watts
  4. 3.8 watts

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Question #198Basic Electricity and Electronics

How much power is being used in a circuit when the voltage is 120 volts DC and the current is 2.5 amperes?

  1. 1440 watts
  2. 300 watts ✓ Correct answer
  3. 48 watts
  4. 30 watts

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Question #199Basic Electricity and Electronics

How can you determine how many watts are being drawn by your transceiver when you are transmitting?

  1. Measure the DC voltage and divide it by 60 Hz
  2. Check the fuse in the power leads to see what size it is
  3. Look in the Radio Amateur's Handbook
  4. Measure the DC voltage at the transceiver and multiply by the current drawn when you transmit ✓ Correct answer

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Question #200Basic Electricity and Electronics

How many amperes are flowing in a circuit when the applied voltage is 120 volts DC and the load is 1200 watts?

  1. 20 amperes
  2. 10 amperes ✓ Correct answer
  3. 120 amperes
  4. 5 amperes

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Question #205Basic Electricity and Electronics

How many watts does a hand-held transceiver put out if the output power is 500 mill watts?

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

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Question #206Basic Electricity and Electronics

What will happen to the resistance if the temperature of a carbon resistor is increased?

  1. It will increase by 20% for every 10 degrees centigrade
  2. It will stay the same
  3. It will change depending on the resistor's temperature coefficient rating ✓ Correct answer
  4. It will become time dependent

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Question #207Basic Electricity and Electronics

What type of capacitor is often used in power-supply circuits to filter the rectified AC?

  1. Disc ceramic
  2. Vacuum variable
  3. Mica
  4. Electrolytic ✓ Correct answer

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Question #208Basic Electricity and Electronics

Which of the following is the primary advantage of ceramic capacitors?

  1. Tight tolerance
  2. High stability
  3. High capacitance for given volume
  4. Comparatively low cost ✓ Correct answer

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Question #209Basic Electricity and Electronics

Which of the following is an advantage of an electrolytic capacitor?

  1. Tight tolerance
  2. Non-polarized
  3. High capacitance for given volume ✓ Correct answer
  4. Inexpensive RF capacitor

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Question #210Basic Electricity and Electronics

Which of the following is one effect of lead inductance in a capacitor used at VHF and above?

  1. Effective capacitance may be reduced ✓ Correct answer
  2. Voltage rating may be reduced
  3. ESR may be reduced
  4. The polarity of the capacitor might become reversed

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Question #211Basic Electricity and Electronics

What is the main disadvantage of using a conventional wire-wound resistor in a resonant circuit?

  1. The resistor's tolerance value would not be adequate for such a circuit
  2. The resistor's inductance could detune the circuit ✓ Correct answer
  3. The resistor could overheat
  4. The resistor's internal capacitance would detune the circuit

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Question #212Basic Electricity and Electronics

What is an advantage of using a ferrite core with a toroidal inductor?

  1. Large values of inductance may be obtained
  2. The magnetic properties of the core may be optimized for a specific range of frequencies
  3. Most of the magnetic field is contained in the core
  4. All of these choices are correct ✓ Correct answer

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Question #213Basic Electricity and Electronics

How should two solenoid inductors be placed so as to minimize their mutual inductance?

  1. In line with their winding axis
  2. With their winding axes parallel to each other
  3. With their winding axes at right angles to each another ✓ Correct answer
  4. Within the same shielded enclosure

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Question #214Basic Electricity and Electronics

Why might it be important to minimize the mutual inductance between two inductors?

  1. To increase the energy transfer between both circuits
  2. To reduce or eliminate unwanted coupling ✓ Correct answer
  3. To reduce conducted emissions
  4. To increase the self-resonant frequency of both inductors

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Question #215Basic Electricity and Electronics

What is an effect of inter-turn capacitance in an inductor?

  1. The magnetic field may become inverted
  2. The inductor may become self resonant at some frequencies ✓ Correct answer
  3. The permeability will increase
  4. The voltage rating may be exceeded

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Question #216Basic Electricity and Electronics

What is the common name for a capacitor connected across a transformer secondary that is used to absorb transient voltage spikes?

  1. Clipper capacitor
  2. Trimmer capacitor
  3. Feedback capacitor
  4. Suppressor capacitor ✓ Correct answer

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Question #217Basic Electricity and Electronics

What is the common name for an inductor used to help smooth the DC output from the rectifier in a conventional power supply?

  1. Back EMF choke
  2. Repulsion coil
  3. Charging inductor
  4. Filter choke ✓ Correct answer

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Question #219Basic Electricity and Electronics

What is the peak-inverse-voltage rating of a rectifier?

  1. The maximum voltage the rectifier will handle in the conducting direction
  2. 1.4 times the AC frequency
  3. The maximum voltage the rectifier will handle in the non-conducting direction ✓ Correct answer
  4. 2.8 times the AC frequency

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