A transformer coupled class A amplifier drives a 16 Ohm loud speaker through 4:1 transformer with Vcc = 36 V. If the circuit delivers 2 Watts to load, the rms voltage across the load assuming transformer efficiency as 100 % is [Figure description: A common-emitter NPN transistor amplifier. Vcc = 36 V feeds the primary winding (N1) of a transformer (turns ratio N1:N2) connected to the collector (collector current Ic). A base bias resistor RB runs from Vcc to the base; the input Vi is coupled to the base through a capacitor C; the emitter is grounded. The transformer secondary (N2) drives a load RL = 16 Ω across which the load voltage VL is measured.]
- A. 3.9 V
- B. 6.29 V
- C. 22.6 V
- D. 5.65 V
Answer: D. 5.65 V
Explanation: Power delivered to load P = VL_rms² / RL => 2 W = VL_rms² / 16 Ω => VL_rms = √32 ≈ 5.657 V ≈ 5.65 V.