A. Changes in temperature cause thermal instability
B. Circuit becomes heavy and costly
C. It becomes difficult to bias the circuit
D. None of the above
Related Mcqs:
- Transformer coupling provides high efficiency because___________?
A. Collector voltage is stepped up
B. resistance is low
C. collector voltage is stepped down
D. none of the above - In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
A. Changes abruptly with frequency
B. Is constant
C. Changes uniformly with frequency
D. None of the above - The maximum efficiency of transformer coupled class A power amplifier is _______________?
A. 30%
B. 50%
C. 80%
D. 45% - A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
A. 5 kO
B. 20 kO
C. 100 kO
D. 10 kO - The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?
A. Power loss in the coupling device
B. Loading effect of the next stage
C. The use of many transistors
The use of many capacitors - In the initial stages of a multistage amplifier, we use______________?
A. RC coupling
B. Transformer coupling
C. Direct coupling
D. None of the above - The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?
A. 4
B. 1
C. 3
D. More than 10 - RC coupling is not used to amplify extremely low frequencies because____________?
A. There is considerable power loss
B. There is hum in the output
C. Electrical size of coupling capacitor becomes very large
D. None of the above - The purpose of RC or transformer coupling is to_____________?
A. Block a.c.
B. Separate bias of one stage from another
C. Increase thermal stability
None of the above - The output of a microphone is rated at -52 db. The reference level is 1V under specified conditions. What is the output voltage of this microphone under the same sound conditions?
A. 5 mV
B. 2 mV
C. 8 mV
D. 5 mV
