NWCA CET TEST
QUESTIONS AND
ANSWERS FULLY SOLVED
1. What is the primary function of a rectifier in an electronic power supply?
A. Convert AC to DC
B. Increase voltage range
C. Filter noise
D. Reduce ripple output
✔ Correct Answer: A
Rectifiers convert alternating current into direct current before further regulation or
filtering.
2. Which instrument is best for measuring small resistance values accurately?
A. Oscilloscope
B. Wheatstone Bridge
C. Spectrum Analyzer
D. TDR Meter
✔ Correct Answer: B
A Wheatstone bridge provides high accuracy for low-resistance measurement.
3. In RF communication, what is the main purpose of modulation?
,A. Increase antenna gain
B. Combine the carrier with information
C. Lower the noise floor
D. Stabilize DC voltage
✔ Correct Answer: B
4. What effect does increasing the gauge number of a wire have on its diameter?
A. Increases diameter
B. Decreases diameter
C. No change
D. Depends on conductor material
✔ Correct Answer: B
5. A capacitor blocks ______ but passes ______.
A. DC, AC
B. AC, DC
C. High voltage, low voltage
D. All current, no current
✔ Correct Answer: A
6. What component is commonly used to store electrical charge?
A. Transistor
B. Diode
C. Capacitor
D. Inductor
, ✔ Correct Answer: C
7. Which type of fire extinguisher should be used for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
✔ Correct Answer: C
8. What frequency range is considered UHF?
A. 30–300 MHz
B. 300–3000 MHz
C. 3–30 MHz
D. 30–300 kHz
✔ Correct Answer: B
9. What tool is used to crimp RJ-45 connectors?
A. Punch-down tool
B. Crimping tool
C. Cable tracer
D. Compression tool
✔ Correct Answer: B
10. Which network topology has a single point of failure at the central device?
QUESTIONS AND
ANSWERS FULLY SOLVED
1. What is the primary function of a rectifier in an electronic power supply?
A. Convert AC to DC
B. Increase voltage range
C. Filter noise
D. Reduce ripple output
✔ Correct Answer: A
Rectifiers convert alternating current into direct current before further regulation or
filtering.
2. Which instrument is best for measuring small resistance values accurately?
A. Oscilloscope
B. Wheatstone Bridge
C. Spectrum Analyzer
D. TDR Meter
✔ Correct Answer: B
A Wheatstone bridge provides high accuracy for low-resistance measurement.
3. In RF communication, what is the main purpose of modulation?
,A. Increase antenna gain
B. Combine the carrier with information
C. Lower the noise floor
D. Stabilize DC voltage
✔ Correct Answer: B
4. What effect does increasing the gauge number of a wire have on its diameter?
A. Increases diameter
B. Decreases diameter
C. No change
D. Depends on conductor material
✔ Correct Answer: B
5. A capacitor blocks ______ but passes ______.
A. DC, AC
B. AC, DC
C. High voltage, low voltage
D. All current, no current
✔ Correct Answer: A
6. What component is commonly used to store electrical charge?
A. Transistor
B. Diode
C. Capacitor
D. Inductor
, ✔ Correct Answer: C
7. Which type of fire extinguisher should be used for electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
✔ Correct Answer: C
8. What frequency range is considered UHF?
A. 30–300 MHz
B. 300–3000 MHz
C. 3–30 MHz
D. 30–300 kHz
✔ Correct Answer: B
9. What tool is used to crimp RJ-45 connectors?
A. Punch-down tool
B. Crimping tool
C. Cable tracer
D. Compression tool
✔ Correct Answer: B
10. Which network topology has a single point of failure at the central device?
