Power supplies Flashcards
Batteries in series add voltages where batteries in parallel add currents.
true
A dual-voltage power supply is also called a ? .
bipolar supply
Which of the following is not one of the steps or processes involved in a complete power supply system?
Combining the outputs of the taps
When connecting power supplies that convert AC to DC, note that the ? will determine the load polarity.
diode polarity
If the waveform across a load resistor is observed to be half-wave pulsating direct current, the rectifier is classified as a ? rectifier.
half-wave
Which of the following represents a half-wave rectifier for the positive input half cycle?
b
Which of the following represents the waveform across RL?
a
Find the effective (rms) voltage of the “AC source.“ Hint: This is a pure sine-wave calculation; do not deduct for the diode.
Vp = Vp - p/2
Veff = Vp/sq root 2
The half-wave average voltage across load RL is ? . Hint: The deduction for the diode must be included in the calculation. Calculate your answer to two decimal places.
Vp(load) = Vp(xfmr) - Vd
Vl(avg) = Vp(load)/pi
The peak current through load RL is ? . Calculate your answer to three decimal places.
Ip(load) = Vp(xmfr) - Vd/Rl
A ? rectifier uses a center-tapped transformer secondary and two diodes.
full-wave
A waveform across the load of a full-wave rectifier is pulsating direct current with half the peak voltage of the secondary because of the center-tap.
true
The AC input cycle is divided into two parts: the positive alternation and the negative alternation.
true
A full-wave rectifier that does not use a center-tapped transformer and utilizes four diodes to provide full-wave rectification is called a ? rectifier.
bridge
Which of the following represents a full-wave rectifier with a center-tapped transformer and a connected load?
a
Which of the following represents an output waveform that results from two input cycles on a full-wave rectifier?
B
full wave on top
Which of the following represents a full-wave rectifier with lines and arrows to indicate direction of electron flow for the positive half of input cycle?
a
Which of the following represents a full-wave rectifier with lines and arrows to indicate direction of electron flow for the negative half of input cycle?
b
The image represents a ? with load RL.
full-wave bridge rectifier
The peak voltage across RL is ? . Calculate your answer to one decimal space.
Vrl(peak) = Vp - (Vd + Vd)
The rectifier converts AC to a(n) pulsating DC voltage.
true
The average voltage across RL is ? . Calculate your answer to two decimal places.
Vave = 2 x Vp/pi
Which of the following is a method used to measure rectified voltages in a half-wave rectifier?
Peak average
Peak-to-peak
Rms
Which of the following formulas is used to find the peak voltage of an un-rectified sine wave?
Vp = Vp-p/2
Which of the following formulas is used to find the rms value of a half-wave rectifier?
Vrms = Vp-p/pi
