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Regulated DC Power Supply Question & Answers

September 2, 2021 By Wat Electrical Leave a Comment

This article lists 100 Regulated DC Power Supply MCQs for engineering students. All the Regulated DC Power Supply Questions & Answers given below includes solution and link wherever possible to the relevant topic.

In all electronic circuits, we require a constant DC voltage because the fluctuations in the input voltage may damage the electronic circuits, so to avoid this we use a regulated power supply.

The voltage regulator is defined as a circuit that keeps the output voltage constant even though the voltage and load vary. A typical power supply unit consists of a transformer, rectifier, and smoothing.

1). The regulated power supply is used in _________________
HintThe regulated power supply is used in DC motors, relays, and actuators
2). The unregulated power supply is used in ___________
HintThe unregulated power supply is used in television, computers, and mobile chargers
3). How many terminals does monolithic voltage regulators have _____________
HintThe monolithic voltage regulators have three terminals they are input, output, and common terminals
4).The features of IC723 linear regulator are ______________
HintThe features of the IC723 linear regulator is small in size, low cost, and it had good load regulation
5). The blocks that regulated DC power supply consists of ____________
HintThe blocks that regulated DC power supply consists of filter and rectifier circuit, transformer, and voltage regulator circuit
6). Which circuit is used for rectification?
HintThe center tap full-wave, half-wave, bridge full-wave rectifiers used for rectification
7). What are the commonly used filter circuits?
HintThe inductors, capacitor input, RC, LC, RLC are the commonly used filter circuits
8). The maximum output power of the push-pull converter topology of SMPS is _________
HintThe maximum output power of the push-pull converter topology of SMPS is 500W
9). How many terminals do fixed voltage regulators have?
HintThe fixed voltage regulators have three terminals they are input, output, and ground terminals
10). Which one of the following is a three-terminal fixed voltage regulator?
HintBoth fixed and adjustable voltage regulators are three-terminal fixed voltage regulators
11). ___________ are the commonly used type of voltage regulators
HintThe IC voltage regulator, Zener diode, SMPS, and transistorized series are the commonly used type of voltage regulators
12). The circuit design of switching regulated power supplies is ______________
HintThe circuit design of switching regulated power supplies is complex
13). The load regulation of switching regulated DC power supply is from ______________
HintThe load regulation of switching regulated DC power supply is from 0.05% - 0.5%
14). The line regulation of switching regulated DC power supply is from ______________
HintThe line regulation of switching regulated DC power supply is from 0.05% - 0.1%
15). What are the advantages of linear power supplies?
HintThe advantages of linear power supplies are they have low noise levels, they are reliable and simple, and the cost is low
16). The ripple (RMS) of switching regulated DC power supply is between ______________
HintThe ripple (RMS) of switching regulated DC power supply is between 10mv to 25mv
17). The efficiency of switching regulated DC power supply is ______________
HintThe efficiency of switching regulated DC power supply is 70-85%
18). The transient recovery of switching regulated DC power supply is ______________
HintThe transient recovery of switching regulated DC power supply is 300 microseconds
19). What are the advantages of switched power supplies?
HintThe advantages of switched power supplies are they are small in size, light-weight, and less expensive
20). The hold-up time of switching regulated DC power supply is between ______________
HintThe hold-up time of switching regulated DC power supply is between 20-30 milliseconds
21). The leakage in switching regulated DC power supply is ______________
HintThe leakage in switching regulated DC power supply is high
22). What are the advantages of battery-based power supplies?
HintThe advantages of battery-based power supplies are they are portable and doesn’t require onsite power
23). The size (power density) of switching regulated DC power supply is ______________
HintThe size (power density) of switching regulated DC power supply is small
24). The power factor in switching regulated DC power supply without PFC is ______________
HintThe power factor in switching regulated DC power supply without PFC is 0.6 – 0.7
25). The power factor in switching regulated DC power supply with PFC is ______________
HintThe power factor in switching regulated DC power supply with PFC is >0.95

Regulated DC Power Supply Important MCQ's

26). The weight of the switching regulated DC power supply is ______________
HintThe weight of the switching regulated DC power supply is very light
27). What are the disadvantages of linear power supplies?
HintThe disadvantages of linear power supplies are size is large, expensive, and the efficiency is poor
28). The switch mode power supply has _____________
HintThe switch-mode power supply has a regulator, rectifier, filter capacitor, transformer, and series transistor
29). What is the standard form of UPS?
HintThe standard form of UPS is Uninterruptable Power Supply
30). What is the standard form of SMPS?
HintThe standard form of SMPS is Switch Mode Power Supply
31). An offline uninterruptable power supplies has ______________ change over time
HintAn offline uninterruptable power supply has 3-8 milliseconds change over time
32). What are the disadvantages of switching regulated DC power supplies?
HintThe disadvantages of switching regulated DC power supplies are they have higher noise, and the circuitry is complex
33). In inverters the changeover time is ______________
HintIn inverters, the changeover time is 500 milliseconds
34). The uninterruptable power supplies categorized into _______________
HintThe uninterruptable power supplies are categorized into three types they are offline UPS, online UPS, and line-interactive UPS
35). What are the disadvantages of battery-based regulated power supplies?
HintThe battery-based regulated power supplies have a short life and the input voltage is fixed
36). Where uninterruptible power supplies are used?
HintAn uninterruptible power supplies are used in data centers, industries, telecommunications, etc
37). What are the advantages of UPS?
HintThe advantages of UPS are it maintains battery life, protects uncertain data loss, and provides surge protection
38). Which one of the following regulator costs is low?
HintThe linear regulator costs is low compare to other regulators
39). The maximum output power of the half-bridge converter topology of SMPS is _________
HintThe maximum output power of the half-bridge converter topology of SMPS is 1000W
40). Which one of the following has low maintenance?
HintThe maintenance is low in uninterrupted power supply
41). In _________ regulator the mass is high
HintIn linear regulator the mass is high
42). The noise is high in _____________ regulator
HintThe noise is high in the PWM switching regulator
43). The power factor of AC lies between __________
HintThe power factor of AC lies between 0 and 1
44). The power factor of DC lies between __________
HintThe power factor of DC lies between always one
45). The direct current obtained from _____________
HintThe direct current obtained from batteries or cells
46). The alternate current obtained from _____________
HintThe alternate current obtained from mains and AC generators
47). The frequency of the direct current is __________
HintThe frequency of the direct current is zero
48). The frequency of the alternate current is __________
HintThe frequency of the alternate current is 50Hz or 60Hz
49). What is the unit of boost inductor?
HintThe unit of boost inductor is mH
50). In the circuit the DC flows in __________
HintIn the circuit, the DC flows in one direction only

Regulated DC Power Supply MCQ's with Hints

51). What is the unit of AC and DC resistors?
HintThe unit of AC and DC resistors is Ω
52). In which one of the following power supply the reliability is low?
HintIn switching DC power supply the reliability is low
53). In which one of the following power supply the maintenance cost is high?
HintIn a linear power supply, the maintenance cost is high compared to switching DC power supply
54). What is the unit of DC capacitors?
HintThe unit of DC capacitors is µF
55). In _____________ power supply the input linear filter is required
HintIn switching DC power supply the input linear filter is required
56). The holdup time of linear DC power supply is _________
HintThe holdup time of linear DC power supply is 1ms-2ms
57). The input voltage range of linear DC power supply is _________
HintThe input voltage range of linear DC power supply is ±10%
58). The regulated DC power supply consists of ___________
HintThe regulated DC power supply consists of a transformer, rectifier, smoothing, regulator, and load
59). The load regulation of linear DC power supply is between ______________
HintThe load regulation of linear DC power supply is between 0.02% - 0.1%
60). What is the function of a transformer in a regulated DC power supply?
HintThe function of a transformer in a regulated DC power supply is it reduces the 230V Ac input voltage to a lower value
61). The line regulation of linear DC power supply is between ______________
HintThe line regulation of linear DC power supply is between 0.02% - 0.05%
62). What are the advantages of Zener diode?
HintThe construction of the Zener diode is simple and it has fewer parts
63). The noise in linear DC power supply is ______________
HintThe noise in the linear DC power supply is 20mv
64). What is the function of the rectifier in the DC power supply?
HintThe function of the rectifier in the DC power supply is to convert AC into a pulsating DC
65). The transient response in linear DC power supply is ______________
HintThe transient response in linear DC power supply is 50µs
66). The design of the linear DC power supply is ______________
HintThe design of the linear DC power supply is simple compare to other power supplies
67). A _____________ circuit is used to smoothen the variations present in the rectified output
HintA filtering circuit is used to smoothen the variations present in the rectified output
68). What are the advantages of the series regulator?
HintThe series regulators are simple to design, and it has the higher current capability
69). What are the advantages of the three-terminal regulator?
HintThe three-terminal regulators have the lowest output noise and ripple, it is the simplest design for end-user, and it has fewer parts
70). The efficiency of linear DC power supply is between ____________
HintThe efficiency of linear DC power supply is between 40-55%
71). The input line filter is not required in __________ power supply
HintThe input line filter is not required in linear power supply
72). The alternating current from transformer consumes___________ power
HintThe alternating current from transformer consumes less power
73). The direct current from generator suitable for ___________ metal
HintThe direct current from generator is suitable for both non-ferrous and ferrous metals
74). The input voltage range of 7905 regulator is ____________
HintThe input voltage range of 7905 regulator is -7.5 to -25V
75). The output voltage of 7905 regulator is ____________
HintThe output voltage of 7905 regulators is -5V

Regulated DC Power Supply MCQ's for Quiz

76). The efficiency of the PWM switching regulator is _________
HintThe efficiency of the PWM switching regulator is 70-80%
77). The RF noise in the PWM switching regulator is _________
HintThe RF noise in the PWM switching regulator is high
78). The circuit design of unregulated power supplies is _________
HintThe circuit design of unregulated power supplies is simple
79). What are the disadvantages of the series regulator?
HintThe disadvantages of the series regulator is they are inefficient
80). What are the disadvantages of the three-terminal regulators?
HintThe three-terminal regulators are less efficient, has larger packages, and high current is required
81). The input voltage range of 7912 regulator is ____________
HintThe input voltage range of 7912 regulators is -14.5V to -35V
82). The output voltage of 7912 regulator is ____________
HintThe output voltage of 7912 regulators is -12V
83). The RF noise in resonant transition switching regulator is _________
HintThe RF noise in resonant transition switching regulator is medium
84). The line regulation of unregulated DC power supply is from ______________
HintThe line regulation of unregulated DC power supply is directly proportional to alternating current input change
85). The ripple (RMS) of unregulated DC power supply is between ______________
HintThe ripple (RMS) of unregulated DC power supply is between 0.5V to 5V
86). The efficiency of unregulated power supplies is _________
HintThe efficiency of unregulated power supplies is 90-95%
87). The leakage in unregulated power supplies is ______________
HintThe leakage in unregulated power supplies is very low
88). The transformers are categorized into ___________
HintThe transformers are categorized into two types they are step down and step up
89). The maximum output power of the forward converter topology of SMPS is _________
HintThe maximum output power of the forward converter topology of SMPS is 300W
90). ____________ filter is used to reduce the Hum and ripple
HintThe LC filter is used to reduce the Hum and ripple
91). The input voltage range of 7915 regulator is ____________
HintThe input voltage range of 7915 regulators is -17.5V to -35V
92). The output voltage of 7915 regulator is ____________
HintThe output voltage of 7915 regulators is -15V
93). The efficiency of the resonant transition switching regulator is _________
HintThe efficiency of the resonant transition switching regulator is 78-92%
94). The SMPS categorized into _______ types according to the output and input waveforms
HintThe SMPS is categorized into four types according to the output and input waveforms they are AC in DC out, DC in DC out, AC in AC out, and DC in AC out
95). ____________ are the topologies of switched-mode power supply
HintThe fly-back, push-pull, and H-bridge circuits are some topologies of switched-mode power supply
96). ____________ are the non-isolated SMPS
HintThe boost, buck, and buck-boost converters are the non-isolated SMPS
97). The maximum output power of the fly-back converter topology of SMPS is _________
HintThe maximum output power of the fly-back converter topology of SMPS is 200W
98). ___________ are the categories of power supplies
HintThe linear regulated power supply and switching mode power supply are the categories of power supplies
99). What are the drawbacks of UPS?
HintThe drawbacks of UPS is the maintenance cost is high, and more energy is required
100). The maximum output power of the full-bridge converter topology of SMPS is _________
HintThe maximum output power of the full-bridge converter topology of SMPS is >1000W
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