Switching Regulator MCQ’s

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This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Switching Regulator”.

1. Fixed voltage regulators and adjustable regulators are often called as
a) Series dissipative regulators
b) Shunt dissipative regulators
c) Stray dissipative regulators
d) All the mentioned

2. Linear series regulators are suited for application with
a) High current
b) Medium current
c) Low current
d) None of the mentioned

3. What is done in switching regulators to minimize its power dissipation during switching?
a) Uses external transistor
b) Uses 1mH choke
c) Uses external transistor and 1mH choke
d) None of the mentioned

4. A series switching regulators
a) Improves the efficiency of regulators
b) Improves the flexibility of switching
c) Enhance the response of regulators
d) All of the mentioned

5. Find the diagrammatic representation of basic switching regulator?
Find the switching regulator from the given diagram
Find the voltage source from the given diagram
Find the pulse generator from the given diagram
Find the switch and filter from the given diagram

6. Which among the following act as a switch in switching regulator?
a) Rectifiers
b) Diode
c) Transistors
d) Relays

7. The switching regulators can operate in
a) Step up
b) Step down
c) Polarity inverting
d) All the mentioned

8. What are the conditions to be satisfied by a voltage source for using it in switching regulator.
i. It must supply the required output power and the losses associated with the switching regulator
ii. It must be large enough to supply sufficient dynamic range line and load variations
iii. It must be sufficient high to meet the minimum requirement of the regulator system to be designed
iv. It may be required to store energy for a specified amount of time during power failure especially if the system is designed for a computer power supply.
a) i and iii
b) i, ii, iii and iv
c) ii, iii and iv
d) i, iii and iv

9. What should be the frequency range of pulse generator?
a) 250 kHz
b) 40 kHz
c) 120 kHz
d) 20 kHz

10. Which of the following is considered to be the most important components of the switching regulator?
a) RC or RLC filter
b) RL or RLC filter
c) ORC or RL filter
d) RC, RLC or RL filter

11. Find the value of Rsc, L and Co for a µA7840 switching regulator to provide +5 v at 3A, using the following specifications: toff= 24µs, ripple voltage = 400mA and ton=26µs.
a) Rsc = 55 mΩ , L = 25µH & Co = 750µF
b) Rsc = 550 mΩ , L = 25µH & Co = 75µF
c) Rsc = 650 mΩ , L = 25µH & Co = 65µF
d) Rsc = 720 mΩ , L = 25µH & Co = 250µF

12. Filter used in switching regulator’s are also as called
a) DC – AC transformers
b) AC – DC transformers
c) DC transformer
d) AC transformer

13. Which is the most commonly used low voltage switching regulators?
a) Powdered Permalloy toroids
b) Fermite EI, U and toroid cores
c) Silicon steel EI butt stacks
d) None of the mentioned

14. Calculate the efficiency of the step down switching regulator given the input voltage Vin= 13.5v and output voltage =6v. Assume the saturating Voltage Vs=1.1v and the forward voltage drop Vd = 1.257v
a) η = 75%
b) η = 48.5%
c) η = 63.9%
d) η = 80.5%

15. Match the characteristics for various switching regulators.

Switching regulatorCharacteristics
1. Inverting(i) [ton / toff ] = [ Vo + Vd] / [Vin -Vs -Vd]; Rsc = ( 0.33/ Ipk)
2. step down(ii) [ton / toff ] = [ Vo + Vd -Vin] / [Vin-Vs] ; Rsc = ( 0.33/ Ipk)
3. step up(iii) [ton / toff ] = [ Modulus Vo +Vd] / (Vin-Vs); Rsc = ( 0.33/ Ipk

a) 1- iii , 2- i , 3- ii
b) 1- i , 2- ii , 3- iii
c) 1- iii , 2- ii , 3- i
d) 1- iii , 2- ii , 3- i

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