ECICA-UNIT1-Power amplifiers

The efficiency of series fed class A power amplifier is

• 78.5%

• 25%

• 50%

• 100%

Arrange the power amplifiers in ascending order according to their efficiency

• A,B,AB,C

• C,AB,B,A

• A,AB,B,C

• A,AB,C,B

Arrange the following power amplifiers according to increasing order of their power dissipation

• A,AB,B,C

• A,B,AB,C

• C,B,A,AB

• C,B,AB,A

The maximum efficiency of class B power amplifier is

Identify the disadvantage of class B power amplifier when compared to class A power amplifier

• Efficiency is more

• less power dissipation

• more output power

• cross over distortion

The advantages of class B power amplifier when compared to class A power are

• More efficiency

• less power dissipation

• More output power

• less output power

• 20W

• 25W

• 160W

• 200W

• 63%

• 78.5%

• 70%

• 50%

A transformer coupled class A power amplifier supplies 2W of power to speaker.If the supply voltage is 36V and ICQ is 150mA,find the efficiency of the circuit