Voltage Regulators - General Questions (7)

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Voltage Regulators - General Questions

49. 

What is the typical dropout voltage for the 7812 fixed positive voltage regulator?
A. 4 mV
B. 100 mV
C. 1.5 V
D. 2 V

Answer: Option D

Explanation:

No answer description available for this question.
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50. 

If a peak rectified voltage for the full-wave filter circuit is 40 V, calculate the filter dc voltage if C = 75 mu (3)1 F and load current is 40 mA
A. 27.9 V
B. 32.12 V
C. 37.78 V
D. 40 V

Answer: Option C

Explanation:

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51. 

The 7912 regulator IC provides ________ .
A. 5 V
B. –5 V
C. 12 V
D. –12 V

Answer: Option D

Explanation:

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52. 

Switching regulator efficiencies can be greater than ________ percent.
A. 60
B. 70
C. 80
D. 90

Answer: Option D

Explanation:

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53. 

Calculate the voltage regulation of a power supply having VNL = 50 V and VFL = 48 V.
A. 4.17%
B. 5.2%
C. 6.2%
D. 7.1%

Answer: Option A

Explanation:

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54. 

Refer to the given figure. This circuit is known as

mcq18_1006_1b
A. a series-pass voltage regulator.
B. a shunt voltage regulator.
C. a step-up switching regulator.
D. a step-down switching regulator.

Answer: Option B

Explanation:

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55. 

Refer to the given figure. Determine the output voltage, VOUT.

mcq18_1006_1a (1)
A. 25 V
B. 5.1 V
C. 20.2 V
D. 4.1 V

Answer: Option C

Explanation:

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56. 

A voltage regulator with a no-load output dc voltage of 12 V is connected to a load with a resistance of 10 omega (4)  If the load resistance decreases to 7.5 omega (4) the load voltage will decrease to 10.9 V. The load current will be ________, and the percent load regulation is ________.
A. 1.45 A, 90.8%
B. 1.45 A, 10.09%
C. 1.2 A, 90.8%
D. 1.2 A, 10.09%

Answer: Option B

Explanation:

No answer description available for this question. 
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