21. A change in the value of the emitter resistance Re in a differential amplifier A. Affects the difference mode gain Ad B. Affects the common mode gain Ac C. Affects both Ad and Ac D. Does not effect either Ad and Ac Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
22. The bandwidth of an RF tuned amplifier is dependent on A. Q-factor of the tuned output circuit B. Q-factor of the tuned input circuit C. Quiescent operating point D. Q-factor of the output and input circuits as well as quiescent operating point Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
23. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in A. Only the temperature B. only the β of the transistor C. Both Temperature & β D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
24. The MOSFET switch in its onstate may be considered equivalent to A. Resistor B. Inductor C. Capacitor D. Battery Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
25. Most of the linear ICs are based on the two-transistor differential amplifier because of its A. Input voltage dependent linear transfer characteristic B. High voltage gain C. High input resistance D. High CMRR Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
26. The horizontal intercept of dc load line is the same as ideal A. Cut off point B. Saturation point C. Operating point D. Quasi saturation point Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
27. A 741-type OP-amp has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this OP-amp & having a voltage gain of 20 db will exhibit -3 db bandwidth of A. 50 KHz B. 100 KHz C. $$\frac{{1000}}{{17}}{\text{KHz}}$$ D. $$\frac{{1000}}{{7.07}}{\text{KHz}}$$ Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
28. A differential amplifier is invariably used in the input stage of all OP-amps. This is dome basically to provide the OP-amps with a very high A. CMRR B. Bandwidth C. Slew rate D. Open-loop gain Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
29. The early effect in a bipolar junction transistor is caused by A. Fast turn-on B. Fast turn-off C. Large collector-base reverse bias D. Large emitter-base forward bias Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
30. In a transistor leakage current mainly depends on A. Doping of base B. Size of emitter C. Rating of transistor D. Temperature Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board