TECH 2831 Final Assessment Fall 2017 Multiple Choice ldentify the choice that be
ID: 2291686 • Letter: T
Question
TECH 2831 Final Assessment Fall 2017 Multiple Choice ldentify the choice that best completes the statement or answers the question. provided. You may write on this test Mark your selection on the answer sheet 1. Refer to Figure 1. The Value of Ve is: +20 V Rc 25k ? 22 k 2 ßde-?-100 500 2 Figure 1 c. 5 V a. 20 V b. 10 V Refer to Figure 1 above. If an emitter-bypass capacitor were added, the voltage gain 2. c. would increase would not change would decrease a. b. Refer to Figure 1 above. If an emitter-bypass capacitor were installed, the new voltage gain Av would be a. 4.96 b. 125 Refer to Figure 2. If Avi -75 and Av2-95, the overall voltage gain would be d. would decrease to zero 3. c. 398 d. 600 4. Voc +15V 33k 33.3k 2 Vout Ci 82k ? 1k Figure 2 a. 75 b. 95 c. 1275 d. 7125 5. In general, coupling capacitors can be considered a. open for signal voltage and a short for de c. lossy b. short for signal voltage and an open for d. short for signal voltage anda short for de dcExplanation / Answer
Answer :- 1) Option C is the correct answer.
Applying approximate analysis, since (101*500) > 10*5000.
Firest we find voltage at base i.e. VB = (20*5)/(22+5) V = 3.7 V
Thus the emitter or collector current, IE = (3.7 - 0.7)/(500) mA = 6 mA.
Hence collector voltage, VC = 20 - (0.006*2.5) V = 5 V.
Answer :- 2) Option C is the correct answer.
The gain increases at higher frequency due to bypass capacitor.
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