Questions from Electronics

Q: For the network of problem 27 a. Determine ICQ using

For the network of problem 27 a. Determine ICQ using the equation ICQ b. Compare with the results of problem 27 for ICQ. c. Compare R’ to RF/. d. Is the stateme...

Q: A 160-W silicon power transistor operated with a heat sink

A 160-W silicon power transistor operated with a heat sink (uSA = 1.5°C>W) has uJC = 0.5°C>W and a mounting insulation of uCS = 0.8°C>W. What maximum power can be handled by the transistor at an ambie...

Q: What maximum power can a silicon transistor (TJmax = 200

What maximum power can a silicon transistor (TJmax = 200°C) dissipate into free air at an ambient temperature of 80°C?

Q: What maximum output power can be delivered by the circuit of Fig

What maximum output power can be delivered by the circuit of Fig. 12.35 if RB is changed to 1.5 kΩ?

Q: If the circuit of Fig. 12.35 is biased at

If the circuit of Fig. 12.35 is biased at its center voltage and center collector operating point, what is the input power for a maximum output power of 1.5 W?

Q: A class A transformer-coupled amplifier uses a 25:1

A class A transformer-coupled amplifier uses a 25:1 transformer to drive a 4-Ω load. Calculate the effective ac load (seen by the transistor connected to the larger turns side of the trans- former).

Q: What turns ratio transformer is needed to couple to an 8-

What turns ratio transformer is needed to couple to an 8-Ω load so that it appears as an 8-kΩ effective load?

Q: Calculate the transformer turns ratio required to connect four parallel 16-

Calculate the transformer turns ratio required to connect four parallel 16-Ω speakers so that they appear as an 8-kΩ effective load.

Q: A transformer-coupled class A amplifier drives a 16-Ω

A transformer-coupled class A amplifier drives a 16-Ω speaker through a 3.87:1 transformer. Using a power supply of VCC = 36 V, the circuit delivers 2 W to the load. Calculate: a. P(ac) across transfo...

Q: Calculate the efficiency of the circuit of Problem 8 if the bias

Calculate the efficiency of the circuit of Problem 8 if the bias current is ICQ = 150 mA.