# Regulated D.C Power Supply Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests

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#### Regulated D.C Power Supply Mcqs – (Electrical Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests

” Regulated D.C Power Supply Mcqs“. Tab this page to check “Latest Regulated D.C Power Supply Mcqs for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others. The most occurred mcqs of Regulated D.C Power Supply in past papers. Past papers of Regulated D.C Power Supply Mcqs. Past papers of Regulated D.C Power Supply Mcqs. Mcqs are the necessary part of any competitive / job related exams. The Regulated D.C Power Supply Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Regulated D.C Power Supply Mcqs. The Important series of Regulated D.C Power Supply Mcqs are given below:

A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?

A. 8 V
B. 6 V
C. 7 V
D. 2 V

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?

A. 25 O
B. 50 O
C. 10 O
D. 40 O

When load current is zero, the Zener current will be_____________?

A. Minimum
B. Zero
C. Maximum
D. None of the above

A power supply can deliver a maximum rated current of 0.5 A at full-load output voltage of 20 V. What is the minimum load resistance that you can connect across the supply?

A. 10 O
B. 15 O
C. 20 O
D. 40 O

A Zener regulator _____________ in the power supply?

A. Data insufficient
B. Decreases the ripple
C. Neither increases nor decreases the ripple
D. Increases the ripple

The Zener current will be minimum when_____________?

D. None of the above

Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?

A. 5 V
B. 15 V
C. 30 V
D. 45 V

If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?

A. 20%
B. 10%
C. 15%
D. 5%

The load voltage is approximately constant when a Zener diode is ________________?

A. Forward biased
B. Reverse biased
C. Unbiased
D. Operating in the breakdown region

If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?

A. Stays the same
B. Decreases
C. Increases
D. None of the above

If the load current drawn by unregulated power supply increases, the d.c. output voltage______________?

A. Stays the same
B. Decreases
C. Increases
D. None of the above

In a loaded Zener regulator, which is the largest Zener current ?

A. Series current
C. Zener current
D. None of the above

Which of these is the best description for a Zener diode ?

A. It is a constant current device
B. It is a diode
C. It is a constant-voltage device
D. It works in the forward region

If the load resistance decreases in a Zener regulator, then Zener current ______________?

A. Decreases
B. Increases
C. Stays the same
D. None of the above

A Zener diode______________?

A. Has a barrier potential of 1 V
B. Acts like a battery in the breakdown region
C. Is a battery
D. Is forward biased

A 30 V Zener will have depletion layer width_______________ that of 10 V Zener?

A. More than
B. Equal to
C. Less than
D. None of the above

What is true about the breakdown voltage in a Zener diode ?

A. It destroys the diode
B. It decreases when load current increases
C. It equals current times the resistance
D. It is approximately constant

A 5 mA changes in Zener current produces a 50 mA change in Zener voltage. What is the Zener impedance ?

A. 1 O
B. 50 O
C. 100 O
D. 10 O

The current in a Zener diode is limited by _______________?

A. Power dissipation
B. External resistance
C. Both (A) and (B)
D. None of the above

A certain regulator has a no-load voltage of 6 V and a full-load output of 5.82 V. What is the load regulation ?

A. 09%
B. 72 %
C. 87 %
D. None of the above

A Zener diode that has very narrow depletion layer will breakdown by____________ mechanism?

A. Both avalanche and Zener
B. Zener
C. Avalanche
D. None of the above

A Zener voltage regulator is used for ____________ load currents?

A. Very high
B. High
C. Moderate
D. Small

A Zener voltage regulator will cease to act as a voltage regulator if Zener current becomes______________?

B. Zero
D. None of the above

Another name for Zener diode is ______________diode?

A. Breakdown
B. Power
C. Voltage
D. Current

For increasing the voltage rating, zeners are connected in_____________?

A. Series-parallel
B. Parallel
C. Series
D. None of the above

In a Zener voltage regulator, the changes in load current produce changes in _________________?

A. Zener current
B. Zener voltage as well as Zener current
C. Zener voltage
D. None of the above

If the doping level is increased, the breakdown voltage of the Zener_______________?

A. Is increased
B. Remains the same
C. Is decreased
D. None of the above

Zener diode are generally made of _____________?

A. Carbon
B. Silicon
C. Germanium
D. None of the above

As the junction temperature increases, the voltage breakdown point for avalanche mechanism______________?

A. Decrease
B. Remains the same
C. Increases
D. None of the above

A Zener diode is used as a _____________voltage regulating device?

A. Shunt
B. Series-shunt
C. Series
D. None of the above

In a 15 V Zener diode , the breakdown mechanism will occur by ______________?

A. Avalanche mechanism
B. Both Zener and avalanche mechanism
C. Zener mechanism
D. None of the above

As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?

A. Remains the same
B. Is decreased
C. Is increased
D. None of the above

A Zener diode utilises_____________characteristic for voltage regulation?

A. Both forward and reverse
B. Reverse
C. Forward
D. None of the above

Commercial power supplies have voltage regulation ______________?

A. of 15%
B. of 10%
C. of 25%
D. within 1%

In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?

A. Increases
B. Remains the same
C. Decreases
D. None of the above

In an unregulated power supply, if load current increases, the output voltage _____________?

A. Increases
B. Decreases
C. Remains the same
D. None of the above

A power supply which has voltage regulation of ____________ is unregulated power supply?

A. 5 %
B. 0 %
C. 10 %
D. 8%

An ideal regulated power supply is one which has voltage regulation of________________?

A. 0%
B. 10%
C. 5%
D. 1%

The rupture of co-valent bonds will occur when the electric field is__________________?

A. 6 V/cm
B. 100 V/cm
C. 1000 V/cm
D. More than 105 V/cm

Zener diode can be used as__________________?

A. d. voltage regulator only
B. c. voltage regulator only
C. both D.C and A.C voltage regulator
D. none of the above

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