1. The primary function of a rectifier is to:
A. Convert DC to AC
B. Convert AC to DC
C. Amplify the AC signal
D. Filter the AC signal
Answer: B. Convert AC to DC
2. A half-wave rectifier uses how many diodes in its circuit?
A. One
B. Two
C. Three
D. Four
Answer: A. One
3. In a full-wave rectifier, the AC signal is:
A. Rectified during only one half-cycle
B. Rectified during both half-cycles
C. Amplified
D. Filtered
Answer: B. Rectified during both half-cycles
4. Which of the following is a disadvantage of a half-wave rectifier?
A. It requires more components than a full-wave rectifier
B. It only rectifies one half of the AC input signal, leading to poor efficiency
C. It does not produce DC voltage
D. It uses more power than a full-wave rectifier
Answer: B. It only rectifies one half of the AC input signal, leading to poor efficiency
5. In a bridge rectifier, how many diodes are used?
A. One
B. Two
C. Three
D. Four
Answer: D. Four
6. The output of a half-wave rectifier is:
A. A continuous DC signal
B. A pulsating DC signal
C. A continuous AC signal
D. A constant AC signal
Answer: B. A pulsating DC signal
7. What is the primary advantage of a full-wave rectifier over a half-wave rectifier?
A. It has a higher efficiency
B. It requires fewer components
C. It is simpler to design
D. It can handle higher voltages
Answer: A. It has a higher efficiency
8. The average DC output voltage of a bridge rectifier is approximately equal to:
A. 0.707 times the peak AC voltage
B. The peak AC voltage
C. 0.5 times the peak AC voltage
D. 1.414 times the peak AC voltage
Answer: A. 0.707 times the peak AC voltage
9. In a full-wave rectifier, which of the following is used to make the circuit work?
A. Two diodes
B. A transformer
C. A filter capacitor
D. Both B and C
Answer: D. Both B and C
10. The ripple factor of a rectified DC signal indicates:
A. The efficiency of the rectifier
B. The amount of AC component in the DC output
C. The number of diodes used in the rectifier
D. The average DC voltage
Answer: B. The amount of AC component in the DC output
11. The primary function of an inverter is to:
A. Convert DC to AC
B. Convert AC to DC
C. Amplify the AC signal
D. Rectify the AC signal
Answer: A. Convert DC to AC
12. Which of the following is true for a square wave inverter?
A. It produces a continuous sinusoidal wave
B. It produces a square waveform with sharp transitions
C. It is suitable for high-efficiency applications
D. It has no harmonic distortion
Answer: B. It produces a square waveform with sharp transitions
13. The output frequency of an inverter is primarily determined by:
A. The input voltage
B. The switching frequency
C. The number of diodes used
D. The size of the transformer
Answer: B. The switching frequency
14. Inverters are commonly used in:
A. Power supply systems for electronic devices
B. DC motor control
C. Solar power systems
D. High-voltage transmission lines
Answer: C. Solar power systems
15. Which of the following is a common application of an inverter?
A. Rectifying AC to DC for battery charging
B. Converting DC from a battery to AC for powering appliances
C. Filtering high-frequency signals
D. Increasing the voltage of AC power
Answer: B. Converting DC from a battery to AC for powering appliances
16. A basic type of inverter is the:
A. Sinusoidal inverter
B. Square wave inverter
C. DC-AC transformer
D. DC rectifier
Answer: B. Square wave inverter
17. Inverters used in renewable energy systems, such as solar, are typically designed to:
A. Convert AC power to DC for storage in batteries
B. Convert DC from solar panels to AC for grid connection
C. Convert DC to higher DC voltage
D. Filter harmonic distortion in DC signals
Answer: B. Convert DC from solar panels to AC for grid connection
18. Which type of inverter is used in high-efficiency applications requiring minimal harmonic distortion?
A. Square wave inverter
B. Modified sine wave inverter
C. Pure sine wave inverter
D. DC-DC converter
Answer: C. Pure sine wave inverter
19. Which of the following is a disadvantage of square wave inverters?
A. High efficiency
B. Low harmonic distortion
C. Can produce undesirable effects in sensitive equipment
D. Simple circuit design
Answer: C. Can produce undesirable effects in sensitive equipment
20. Inverters are crucial in systems where:
A. Power needs to be transmitted over long distances
B. DC needs to be converted to AC for use in households or industries
C. AC is directly used for charging batteries
D. Power conversion is not needed
Answer: B. DC needs to be converted to AC for use in households or industries