1. . Regulated power supplies are used in __________
(A) Mobile chargers
(B) All of the above
(C) Computers
(D) Measurement devices
2. . The voltage regulator output impedance is _______
(A) Very small
(B) High
(C) Very high
(D) None of the above
3. . The Zener current is maximum when the load current is ___________
(A) None of the above
(B) Infinity
(C) One
(D) Zero
4. . The Zener diode made of _______
(A) Silver
(B) None of the above
(C) Copper
(D) Silicon
5. . The regulated DC power supply also called ________
(A) None of the above
(B) Non-linear power supply
(C) Both a and b
(D) Linear power supply
6. . Rectification can be done by using ______
(A) Transformers
(B) Bridge rectifiers
(C) Conductors
(D) None of the above
7. . The output of the rectification is ______
(A) Bidirectional
(B) Unidirectional
(C) Multidirectional
(D) None of the above
8. . The circuits are ________ in switch-mode power supply
(A) Simple
(B) None of the above
(C) Moderate
(D) Complex
9. . In switch-mode power supply the regulation of voltage is done by controlling _________
(A) Voltage range
(B) Duty cycle
(C) Both a and b
(D) None of the above
10. . The noise and interference in switch-mode power supply is _______
(A) Less
(B) Very less
(C) More
(D) None of the above
(A) Full wave rectifier
(B) Battery
(C) Delay
(D) All of the above
11. . A Zener diode utilises ………… characteristic for voltage regulation
(A) Forward
(B) None of the above
(C) Both forward and reverse
(D) Reverse
12. . Another name for Zener diode is ………… diode
(A) Current
(B) Voltage
(C) Power
(D) Breakdown
13. . Which of the following can be a source of supply in dc power supplies?
(A) Battery
(B) Dry cell
(C) All of the mentioned
(D) Full wave rectifier
14. . Which of the following might not be needed in a power supply?
(A) The transformer
(B) The filter
(C) All of the above are generally needed
(D) The rectifier
15. . In a supply designed to provide high power at low voltage, the best rectifier design would probably be:
(A) Full-wave, center-tap
(B) Half-wave
(C) Bridge
(D) Voltage multiplier
16. . The part of a power supply immediately preceding the regulator is:
(A) The transformer
(B) The filter
(C) The rectifier
(D) The ac input
17. . Transient suppression minimizes the chance of:
(A) Diode failure
(B) Transformer failure
(C) Filter capacitor failure
(D) Poor voltage regulation
18. . If a half-wave rectifier is used with 117-V rms ac (house mains), the average dc output voltage is about:
(A) 52.7 V
(B) 105 V
(C) 117 V
(D) 328 V
19. . The output of a rectifier is:
(A) 60-Hz ac
(B) Pulsating dc
(C) Smooth dc
(D) 120-Hz ac