ATT Test 7 with Verified Answers

ATT Test 7 with Verified Answers



Pulsating DC - Answer-Current that varies in amplitude but does not reverse polarity `Not alt. Current
because polarity remains the same



Protection. - Answer-Optional section in an scr power supply. Prevents damage to power supply from
excess current flow



AC to DC - Answer-Diode reflecters



Power Supply - Answer-AC to DC



Half Wave Diode Reflector - Answer-AC to DC

(VDC=VPeak of secondary x .318)



Full Wave Diode Rectifier - Answer-AC to DC

VAVG= [VPP/2] x .636

If center tapped:

VAVG= [VPP/4] x .636

Diodes preform reflection

, 180° out of phase



Bridge Diode Rectifier - Answer-Only conducts if forward biased

(VAVG= VPEAK x .636)

Output: pulsating DC



Half Wave rectifier freq - Answer-Ripple req: same as input freq



Full wave rectifier freq - Answer-Ripple freq: twice input freq

With half VPEAK output



Bridge rectifier freq - Answer-Ripple freq: twice input freq

Output: twice the voltage of a fullwave



Applied voltage is taken across the full potential of the transformer - Answer-Advantage of a Bridge vs
Fullwave



Voltage regulators purpose - Answer-Adjust voltage to maintain Eout at a constant level



Zener diode normal operation - Answer-Fwd biased: low ohms

Rev biased: high ohms



Zener diode - Answer-Series voltage regulator



Efficiency of a full wave vs half wave - Answer-Full wave is more efficient because an output is
developed for entire wave form