A relay is ___________switch?
A. A mechanical
B. An electronic
C. An electromechanical
D. None of the above
Month: December 2018
A power supply has a voltage regulation of 1%. If the no-load voltage is 20 V, what is the full-load voltage ?
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. 7 V
C. 6 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 ?
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. 10 O
B. 50 O
C. 25 O
D. 40 O
When load current is zero, the Zener current will be_____________?
When load current is zero, the Zener current will be_____________?
A. Zero
B. Minimum
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 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. 20 O
C. 15 O
D. 40 O
A Zener regulator _____________ in the power supply?
A Zener regulator _____________ in the power supply?
A. Increases the ripple
B. Decreases the ripple
C. Neither increases nor decreases the ripple
D. Data insufficient
The Zener current will be minimum when_____________?
The Zener current will be minimum when_____________?
A. Load current is maximum
B. Load current is minimum
C. Load current is zero
D. None of the above
Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
Two similar 15 V Zeners are connected in series. What is the regulated output voltage ?
A. 15 V
B. 5 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?
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. 10%
B. 20%
C. 15%
D. 5%
The load voltage is approximately constant when a Zener diode is ________________?
The load voltage is approximately constant when a Zener diode is ________________?
A. Forward biased
B. Unbiased
C. Reverse biased
D. Operating in the breakdown region