resistance-and-power electronics question and answers -Page 6

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Resistance and Power problems

1. Resistor tolerance is either printed on the component, or is provided by:
Options
A. keyed containers
B. size
C. color code
D. ohmmeter reading

Correct Answer: color code

2. A conductor's cross-sectional area in circular mils for inch is:
Options
A. 500 cmils
B. 100,000 cmils
C. 1,000,000 cmils
D. 500,000,000 cmils

Correct Answer: 1,000,000 cmils

3. What type of resistors have a tolerance rating of 5% or greater?
Options
A. precision
B. SIP
C. general-purpose
D. wirewound

Correct Answer: general-purpose

4. For P = V²/R, a decrease in resistance should produce:
Options
A. a decrease in power
B. an increase in ohms
C. an increase in power
D. a decrease in current

Correct Answer: an increase in power

5. One advantage of a carbon film resistor over a carbon composition resistor is:
Options
A. less circuit noise
B. smaller size
C. higher wattage
D. poor tolerance

Correct Answer: less circuit noise

6. Which formula shows a direct proportionality between power and voltage?
Options
A. V = IR
B. P = VI
C. P = IR
D. I = V/R

Correct Answer: P = VI

7. A potentiometer has how many leads?
Options
A. 1
B. 2
C. 3
D. 4

Correct Answer: 3

8. If a calculator display was "0.00263," what would this answer be in percent?
Options
A. 0.026%
B. 0.26%
C. 2.63%
D. 26.3%

Correct Answer: 0.26%

9. A 33 kΩ resistor with a 20% tolerance checks out as ok with which of the following ohmmeter readings?
Options
A. 26400 ohms
B. 24183 ohms
C. 6600 ohms
D. 39970 ohms

Correct Answer: 26400 ohms

10. A wire with a smaller cross-sectional area will produce:
Options
A. less heat
B. more conductance
C. less resistance
D. more heat

Correct Answer: more heat

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