INVERTERS UPS SMPS

1. What is the primary function of an inverter?

a) Convert AC to DC

b) Convert DC to AC ✓

c) Store AC power

d) Regulate high voltage

2. Which section in a UPS manages the charging of the battery?

a) Inverter

b) Rectifier + Charger ✓

c) Filter

d) Critical Load

3. Inverters and UPS are essential for providing backup power solutions during _____?

a) High frequency noise

b) Electricity outages ✓

c) Radio signal loss

d) Antenna failure

4. Which type of inverter is far more complex and expensive but reserved for sensitive medical equipment?

a) Modified sine wave

b) True sine wave ✓

c) Center-tapped inverter

d) Battery back-up inverter

5. A solar inverter that is powered by solar energy collected during the day is an example of _____?

a) Electrical energy conversion ✓

b) Mechanical oscillation

c) Thermal stability

d) Audio amplification

6. In a simple basic inverter circuit, what components act as switches to convert DC to AC?

a) NPN Transistors ✓

b) Center-tapped transformers

c) Charging batteries

d) Audio amplifiers

7. A UPS is divided into which two types?

a) Modified and Pure sine wave

b) Offline and Online ✓

c) Grid-tie and Stand-alone

d) Rectifier and Inverter

8. What does UPS stand for?

a) Universal Power Storage

b) Uninterruptible Power Supply ✓

c) Under-voltage Power System

d) Uniform Power Source

9. Which type of UPS directly supplies power from the mains and only switches to backup when mains power fails?

a) Online UPS

b) Offline UPS ✓

c) SMPS UPS

d) Grid tie inverter

10. An Online UPS is characterized by _____?

a) Being simple and compact in size

b) Providing power only when input power is absent

c) Continuously supplying power regardless of input presence ✓

d) Using a solar energy source only

11. The block in a UPS that converts AC from the mains to DC for the battery is the _____?

a) Rectifier + Charger ✓

b) Filter

c) Inverter

d) Critical Load

12. Where is energy stored in a UPS system?

a) Rectifier

b) Battery Bank ✓

c) Transistor Base

d) Center tap

13. In the UPS block diagram, which section reduces noise and fluctuations?

a) Charger

b) Filter ✓

c) Inverter

d) SMPS

14. What does SMPS stand for?

a) Simple Mode Power Supply

b) Switched-Mode Power Supply ✓

c) Solar-Mode Power Supply

d) Standard-Mode Power System

15. Which of the following is a key feature of SMPS?

a) Large bulky size

b) High efficiency ✓

c) Single voltage level only

d) No overload protection

16. SMPS is widely used in which application?

a) Computers and chargers ✓

b) Public address microphones

c) Passive antenna systems

d) CRT television display tubes

17. Which component stores electrical energy in DC form within a UPS?

a) SMPS

b) Battery Bank ✓

c) Filter

d) Rectifier

18. In a simple inverter circuit, resistors R1 and R2 are used to _____?

a) Boost the voltage

b) Limit the base current of transistors ✓

c) Connect the battery to the load

d) Store electrical energy

19. The device that converts AC power into DC power for backup charging is a part of _____?

a) Oscillatory circuit

b) Power electronics ✓

c) Audio frequency section

d) High-frequency carrier generation

20. Modified sine wave inverters are generally used because _____?

a) They are more expensive than pure sine wave

b) Most electrical appliances do not require a true sine wave ✓

c) They are powered by solar energy only

d) They are used exclusively for medical equipment