1. For dc, the current in a coupling circuit is
a. Zero
b. Maximum
c. Minimum
d. Average
a. Zero
2. The current in a coupling circuit for high frequencies is
a. Zero
b. Maximum
c. Minimum
d. Average
b. Maximum
3. A coupling capacitor is
a. A dc short
b. An ac open
c. A dc open and an ac short
d. A dc short and an ac open
c. A dc open and an ac short
4. In a bypass circuit, the top of a capacitor is
a. An open
b. A short
c. An ac ground
d. A mechanical ground
c. An ac ground
5. The capacitor that produces an ac ground is called a
a. Bypass capacitor
b. Coupling capacitor
c. Dc open
d. Ac open
a. Bypass capacitor
6. The capacitors of a CE amplifier appear
a. Open to ac
b. Shorted to dc
c. Open to supply voltage
d. Shorted to ac
d. Shorted to ac
7. Reducing all dc sources to zero is one of the steps in getting the
a. DC equivalent circuit
b. AC equivalent circuit
c. Complete amplifier circuit
d. Voltage-divider biased circuit
b. AC equivalent circuit
8. The ac equivalent circuit is derived from the original circuit by shorting all
a. Resistors
b. Capacitors
c. Inductors
d. Transistors
b. Capacitors
9. When the ac base voltage is too large, the ac emitter current is
a. Sinusoidal
b. Constant
c. Distorted
d. Alternating
c. Distorted
10. In a CE amplifier with a large input signal, the positive half cycle of the ac emitter current is
a. Equal to the negative half cycle
b. Smaller than the negative half cycle
c. Larger than the negative half cycle
d. Equal to the negative half cycle
c. Larger than the negative half cycle
11. Ac emitter resistance equals 25 mV divided by the
a. Quiescent base current
b. DC emitter current
c. AC emitter current
d. Change in collector current
b. DC emitter current
12. To reduce the distortion in a CE amplifier, reduce the
a. DC emitter current
b. Base-emitter voltage
c. Collector current
d. AC base voltage
d. AC base voltage
13. If the ac voltage across the emitter diode is 1 mV and the ac emitter current is 0.1 mA, the ac resistance of the emitter diode is
a. 1 ohm
b. 10 ohm
c. 100 ohm
d. 1 kohm
b. 10 ohm
14. A graph of ac emitter current versus ac base-emitter voltage applies to the
a. Transistor
b. Emitter diode
c. Collector diode
d. Power supply
b. Emitter diode
15. The output voltage of a CE amplifier is
a. Amplified
b. Inverted
c. 180 degrees out of phase with the input
d. All of the above
d. All of the above
16. The emitter of a CE amplifier has no ac voltage because of the
a. DC voltage on it
b. Bypass capacitor
c. Coupling capacitor
d. Load resistor
b. Bypass capacitor
17. The voltage across the load resistor of a CE amplifier is
a. Dc and ac
b. DC only
c. AC only
d. Neither dc nor ac
c. AC only
18. The ac collector current is approximately equal to the
a. AC base current
b. AC emitter current
c. AC source current
d. AC bypass current
b. AC emitter current
19. The ac emitter current times the ac emitter resistance equals the
a. Dc emitter voltage
b. AC base voltage
c. AC collector voltage
d. Supply voltage
b. AC base voltage
20. The ac collector current equals the ac base current times the
a. AC collector resistance
b. DC current gain
c. AC current gain
d. Generator voltage
c. AC current gain
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