Gibilisco - Resistors
- 1.Proper biasing in an amplifier circuit
- A.
Causes it to oscillate.
- B.
Prevents an impedance match.
- C.
Can be obtained using a voltage divider network.
- D.
Maximizes current flow.
- 2.A transistor can be protected from needless overheating by
- A.
A current-limiting resistor.
- B.
Bleeder resistors.
- C.
Maximizing the drive.
- D.
Shorting out the power supply when the circuit is off.
- 3.A bleeder resistor
- A.
Is connected across the capacitor in a power supply.
- B.
Keeps a transistor from drawing too much current.
- C.
Prevents an amplifier from being overdriven.
- D.
Optimizes the efficiency of an amplifier.
- 4.Carbon-composition resistors
- A.
Can handle gigantic levels of power.
- B.
Have capacitance or inductance along with resistance.
- C.
Have essentially no capacitance or inductance.
- D.
Work better for ac than for dc.
- 5.A logical place for a wirewound resistor is
- A.
In a radio-frequency amplifier.
- B.
In a circuit where a noninductive resistor is called for.
- C.
In a low-power radio-frequency circuit.
- D.
In a high-power dc circuit.
- 6.A metal-film resistor
- A.
Is made using a carbon-based paste.
- B.
Does not have much inductance.
- C.
Can dissipate large amounts of power.
- D.
Has considerable inductance.
- 7.What type of resistor, or combination of resistors, would you use as the meter-sensitivitycontrol in a test instrument, when continuous adjustment is desired?
- A.
A set of switchable, fixed resistors
- B.
A linear-taper potentiometer
- C.
An audio-taper potentiometer
- D.
A wirewound resistor
- 8.What type of resistor, or combination of resistors, would you use as the volume control in astereo compact-disc (CD) player?
- A.
A set of switchable, fixed resistors
- B.
A linear-taper potentiometer
- C.
An audio-taper potentiometer
- D.
A wirewound resistor
- 9.If a sound triples in actual power level, approximately what is this, expressed in decibels?
- A.
+3 dB
- B.
+5 dB
- C.
+6 dB
- D.
+9 dB
- 10.Suppose a sound changes in volume by −13 dB. If the original sound power is 1.0 W, what isthe final sound power?
- A.
13 W
- B.
77 mW
- C.
50 mW
- D.
There is not enough information given here to answer this question.
- 11.The sound from a portable radio is at a level of 50 dB. How many times the threshold ofhearing is this, in terms of actual sound power?
- A.
50
- B.
169
- C.
5000
- D.
100,000
- 12.An advantage of a rheostat over a potentiometer is the fact that
- A.
A rheostat can handle higher frequencies.
- B.
A rheostat is more precise.
- C.
A rheostat can handle more current.
- D.
A rheostat works better with dc.
- 13.A resistor is specified as having a value of 68 Ω, but is measured with an ohmmeter as 63 Ω.The value is off by which of the following percentages?
- A.
7.4%
- B.
7.9%
- C.
5%
- D.
10%
- 14.Suppose a resistor is rated at 3.3 kΩ 5%. This means it can be expected to have a valuebetween
- A.
2970 Ω and 3630 Ω.
- B.
3295 Ω and 3305 Ω.
- C.
3135 Ω and 3465 Ω.
- D.
2.8 kΩ and 3.8 kΩ.
- 15.A package of resistors is rated at 56 Ω 10%. You test them with an ohmmeter. Which ofthe following values indicates a reject?
- A.
50.0 Ω
- B.
53.0 Ω
- C.
59.7 Ω
- D.
61.1 Ω
- 16.A resistor has a value of 680 Ω, and you expect that it will have to draw 1 mA maximumcontinuous current in a circuit you’re building. What power rating is good for this application,but not needlessly high?
- A.
1⁄4 W
- B.
1⁄2 W
- C.
1 W
- D.
2 W
- 17.Suppose a 1-kΩ resistor will dissipate 1.05 W, and you have a good supply of 1-W resistors ofvarious ohmic values. If there’s room for 20 percent resistance error, the cheapest solution is to use
- A.
Four 1-kΩ, 1-W resistors in series-parallel.
- B.
A pair of 2.2-kΩ, 1-W resistors in parallel.
- C.
A set of three 3.3-kΩ, 1-W resistors in parallel.
- D.
A single 1-kΩ, 1-W resistor, because all manufacturers allow for a 10 percent margin of safety when rating resistors for their power-handling capability.
- 18.Suppose a carbon-composition resistor has the following colored bands on it: red, red, red,gold. This indicates a resistance of
- A.
22 Ω.
- B.
220 Ω.
- C.
2.2 kΩ.
- D.
22 kΩ.
- 19.The actual resistance of the component described in the previous question can be expected tovary above or below the specified ohmic value by up to what amount?
- A.
11 Ω
- B.
110 Ω
- C.
22 Ω
- D.
220 Ω
- 20.Suppose a carbon-composition resistor has the following colored bands on it: gray, red,yellow. This unit can be expected to have a value within approximately what range?
- A.
660 kΩ to 980 kΩ
- B.
740 kΩ to 900 kΩ
- C.
7.4 kΩ to 9.0 kΩ
- D.
The manufacturer does not make any claim.
Questions: 8 | Attempts: 135 | Last updated: Jan 21, 2021
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