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• 1. Power Supply Basics
• 2. Regulated Power Supplies
• 3. Switched Mode Power Supplies

Module 2.4

Regulated Power Supplies Quiz

Try this quiz, based on the information you can find in Power Supplies Module 2. Submit your answers and see how many you get right. If you get any answers wrong, just follow the hints to find the right answer, and learn about Regulated Power Supplies as you go.

1.

Refer to Fig. 2.4.1.What would be the likely output voltage V_OUT?

• a) 4.3V
• b) 4.7V
• c) 5.0V
• d) 3.6V

2.

Refer to Fig 2.4.1. Which of the following actions would occur if a load resistance connected across the output terminals decreased in value?

• a) The output current would increase and Tr1 would conduct less heavily to maintain a constant output voltage.
• b) The output current would decrease and Tr1 would conduct more heavily to maintain a constant output voltage.
• c) The output voltage would decrease, reducing the voltage across D_Z causing Tr1 conduction to decrease and the output voltage to rise to norm
• d) D_Z would ensure that the base voltage of Tr1 remains at a constant voltage so that the output voltage also remains stable.

3.

Refer to Fig 2.4.2. What preferred value of resistance would be required for R in order to maintain a minimum zener current (I_Z) of 1mA?

• a) 330Ω
• b) 270Ω
• c) 220Ω
• d) 180Ω

4.

Which of the following methods would be used to improve the regulation factor of a shunt regulator circuit?

• a) Connect a second shunt regulator in cascade.
• b) Use a point of load regulator.
• c) Use a transistor shunt regulator.
• d) Use a decoupling capacitor across the regulator output.

5.

Refer to Fig 2.4.3. Which of the following statements correctly describes the output voltage V_OUT?

• a) V_OUT = V_CB Tr1 + V_CETr2
• b) V_OUT = V_R1 + V_DZ
• c) V_OUT = V_S - V_CETr1
• d) V_OUT = V_R2 + V_CETr2 - V_DZ

6.

Refer to Fig 2.4.3. What will be the effect of moving the slider of VR1 downwards?

• a) The current through Tr2 will increase.
• b) The output voltage will decrease.
• c) The voltage across Tr1 collector/emitter will decrease.
• d) The current through D_Z will be unchanged.

7.

Refer to Fig 2.4.3. What is the purpose of Tr2?

• a) Shunt regulator current amplifier transistor.
• b) Over voltage protection transistor.
• c) Over current shut down transistor.
• d) Error amplifier transistor.

8.

Refer to Fig 2.4.4. Which of the following components is responsible for sensing the current value?

• a) R4
• b) R5
• c) R8
• d) R9

9.

Refer to Fig 2.4.4. What is the purpose of D_Z2?

• a) To regulate the output voltage.
• b) To act as a fast switch for the crowbar circuit.
• c) To activate the over current circuit.
• d) To increase the sensitivity of the crowbar circuit.

10.

Refer to Fig. 2.4.5. What is the purpose of D1?

• a) To prevent damage to the I.C. in case of a short circuit input.
• b) To prevent damage to the circuit being supplied, in case of a faulty I.C.
• c) To remove positive voltage spikes at the I.C. output.
• d) To provide negative feedback for the I.C.

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