Analog Circuit Class A and Class B Amplifiers Quiz

What is the formula for calculating the output power of a Class A amplifier?

• -R_C / R_E

• V_CC * I_CC

• V_CC * I_Q

• (V_CC / 2)^2 / R_L

Why do Class B amplifiers suffer from crossover distortion?

• Due to low power efficiency

• Due to high voltage gain

• Due to the non-conduction of transistors near zero input signal

• Due to excessive power dissipation

What is the maximum power efficiency of the Class A amplifier in the given problem?
Vcc = 20V and a load resistance of 8 ohms.

• 25%

• 30%

• 50%

• 60%

How can crossover distortion in Class B amplifiers be minimized?

• By using Class AB configuration

• By increasing the load resistance

• By decreasing the input voltage

• By reducing the feedback mechanisms

What is the formula for calculating the maximum efficiency of a Class B amplifier?

• P_out = V_m^2 / 2R_L

• P_DC = 2V_m / πR_L

• A_v = -R_C / R_E

• P_in = V_CC * I_CC

What is the power dissipation in the Class A amplifier in the given problem?
A Class A amplifier has a DC supply voltage of 15V, and it operates with a quiescent current of 2A.

• 15W

• 20W

• 30W

• 25W

Why is there crossover distortion in Class B amplifiers?

• Due to high voltage gain

• Due to the non-conduction of transistors near zero input signal

• Due to excessive power dissipation

• Due to low power efficiency

What is the voltage gain of the Class A amplifier in the given problem? RL=10 ohms and Rc=500 ohms, Vin = 2V

• -75

• -25

• -50

• -100

What is the maximum efficiency of the Class B amplifier in the given problem? Vm = 10 V and RL= 4 ohms

• 65%

• 70%

• 75%

• 80%

What is the output voltage of the Class A amplifier in the given problem? RL = 10 ohms, RC=500 ohms and Vin = 2V.

• -125V

• -100V

• -75V

• -50V