Regulated Power Supplies » Exercise - 3 101. In a simple series regulator circuit, which of the following components is the controlling element? (a) Load resistor (b) Zener diode (c) Transistor Q1 (d) None of the above 102. What regulated output voltage is provided for the following circuit elements: R1 = 15 kΩ, R2 = 35 kΩ, and VZ = 11.2 V? (a) 16.50 V (b) 17 V (c) 17.35 V (d) 18.25 V 103. Nota 104. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator? (a) Zener diode (b) Transistor base-emitter voltage (c) Both the Zener diode and the transistor base-emitter voltage (d) None of the above 105. In a full-wave rectifier, if no load were connected across the capacitor, the output voltage would ideally be a(n) ________. (a) ac voltage (b) constant dc voltage (c) pulsating dc voltage (d) ramp voltage 106. The output of a loaded power supply is ________ that of the unloaded. (a) the same as (b) larger than (c) smaller than (d) None of the above 107. The frequency of the output voltage of a full-wave rectifier is ________ the frequency of its input voltage. (a) the same as (b)…
Special Diodes » Exercise - 1 1. A Zener diode : (a) Is a battery under forward biased condition (b) Acts like battery when it breakdowns (c) Is a switch (d) Is a device having barrier potential more than 5V 2. At 25ºC, a Zener diode rates at 2 watts, its power rating at 50ºC will be : (a) Zero watts (b) Less than 1 watt (c) Greater than 2 watts (d) Less than 2 watts 3. Silicon is appreciably employed as a base material compared to germanium while manufacturing Zener diode since : (a) silicon is abundantly available (b) it is costlier (c) it has low current capability (d) it has high temperature capability 4. The capacitance of a varactor diode increases, when the reverse voltage across it is : (a) Decreased (b) Increased (c) Kept constant (d) None of the above 5. The main advantage of a point contact diode is that : (a) The ratio of forward current to reverse current is very high (b) Low input impedance (c) Its cut-in voltage is equal to zero (d) Its reverse resistance is infinite 6. Which one of the following is a Square law device ? (a) Zener diode (b) Crystal diode (c) Tunnel diode (d) Varactor diode 7. Match the given lists. List I…
Rectifiers » Exercise - 121. The PIV rating of each diode in a bridge rectifier is ........ that of the equivalent centretap rectifier. (a) one-half (b) the same as (c) twice (d) four times
Rectifiers » Exercise - 125. The most widely used rectifier is ........... (a) half-wave rectifier (b) centre-tap full-wave rectifier (c) bridge full-wave rectifier (d) none of the above
Regulated Power Supplies » Exercise - 3 101. In a simple series regulator circuit, which of the following components is the controlling element? (a) Load resistor (b) Zener diode (c) Transistor Q1 (d) None of the above 102. What regulated output voltage is provided for the following circuit elements: R1 = 15 kΩ, R2 = 35 kΩ, and VZ = 11.2 V? (a) 16.50 V (b) 17 V (c) 17.35 V (d) 18.25 V 103. Nota 104. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator? (a) Zener diode (b) Transistor base-emitter voltage (c) Both the Zener diode and the transistor base-emitter voltage (d) None of the above 105. In a full-wave rectifier, if no load were connected across the capacitor, the output voltage would ideally be a(n) ________. (a) ac voltage (b) constant dc voltage (c) pulsating dc voltage (d) ramp voltage 106. The output of a loaded power supply is ________ that of the unloaded. (a) the same as (b) larger than (c) smaller than (d) None of the above 107. The frequency of the output voltage of a full-wave rectifier is ________ the frequency of its input voltage. (a) the same as (b)…