Discussion
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- Question
If conductance increases as temperature increases, this is known as a:
Options- A. positive coefficient
- B. negative current flow
- C. negative coefficient
- D. positive resistance
- Correct Answer
- negative coefficient
ExplanationA negative temperature coefficient (NTC) occurs when the thermal conductivity of a material rises with increasing temperature, typically in a defined temperature range.Note: The reciprocal of electrical Resistance is called Conductance.
More questions
- 1. What procedure should be followed when troubleshooting with an ammeter or voltmeter?
Options- A. Short the leads and adjust.
- B. Check the meter's external power supply.
- C. Start with the highest scale and adjust down to a lower scale.
- D. Start with the lowest scale and adjust up to a higher scale. Discuss
Correct Answer: Start with the highest scale and adjust down to a lower scale.
- 2. Voltage-divider bias provides:
Options- A. an unstable Q point
- B. a stable Q point
- C. a Q point that easily varies with changes in the transistor's current gain
- D. a Q point that is stable and easily varies with changes in the transistor's current gain Discuss
Correct Answer: a stable Q point
- 3. Kirchhoff's voltage law states that:
Options- A. the sum of the voltage drops in a series circuit is equal to the total applied voltage
- B. the algebraic sum of the resistances is equal to the sum of the voltages
- C. the algebraic sum of the individual currents around a closed loop is zero
- D. the voltages developed across each element in a series circuit are identical Discuss
Correct Answer: the sum of the voltage drops in a series circuit is equal to the total applied voltage
- 4. Clampers are often called peak detectors.
Options- A. True
- B. False Discuss
Correct Answer: False
- 5. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.
Options- A. True
- B. False Discuss
Correct Answer: True
- 6. The operands in an addition operation consist of the augend and the addend.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. In a BJT, the collector current is approximately equal to the base current.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. A sine wave has:
Options- A. four quadrants
- B. two alternations
- C. one period
- D. all of the above Discuss
Correct Answer: all of the above
- 9. The greater the selectivity, the wider the bandwidth.
Options- A. True
- B. False Discuss
Correct Answer: False
- 10. The unit of magnetic flux density is the weber.
Options- A. True
- B. False Discuss
Correct Answer: False
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