voltage of 25.7v at he collector of Qe Which of the following statements about t

Question

voltage of 25.7v at he collector of Qe Which of the following statements about this circuit is correct? A. The circuit is opcrating normally B. An emitter-to-base short is present in Q, C. Resistor R, has increased in value. D. Resistor R, is open in the circuit 7. A modulation technique that uses two tones that are separated in frequency is called A. SSB B. CTSS C. FSK D. DTMF Use this illustration to answer the following question. SUPPLY Ry 25 V 207V Dr 8. When a load is applied to the power supply in the circuit shown, the output voltage tends to decrease. Which of the following actions in the circuit counteracts this tendency A. The conduction of Q, decreases. B. The voltage at the junction of R, and R, increases. C. The conduction of 02 decreases. D. The voltage at the emitter of 02 increases. 9. Which of the following does a relaxation oscillator depend on for proper operation? A. Frequency synthesis B. Negative feedback C. Positive feedback D. Negative resistance

Explanation / Answer

6). Collector of Q2 = Base of Q1

and emitter of Q1 is at 25V, So circuit to function nomally base of Q1 = 25 + 0.7 = 25.7V

So circuit functions normally.

7). FSK ----frequency shift keying

here 1 is represented by f1

and 0 is represented by f2.

So for modulation need of two tone frequency.

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