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ATT Test 7 - Questions And Correct Answers (Detailed)
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ATT Test 7 - Questions And Correct Answers (Detailed)
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ATT Test 7 - Questions And Correct Answers (Detailed)Pulsating DC Right Ans - Current that varies in amplitude but does not
reverse polarity `Not alt. Current because polarity remains the same
Protection. Right Ans - Optional section in an scr power supply. Prevents
damage to power supply from excess current flow
AC to DC Right Ans - Diode reflecters
Power Supply Right Ans - AC to DC
Half Wave Diode Reflector Right Ans - AC to DC
(VDC=VPeak of secondary x .318)
Full Wave Diode Rectifier Right Ans - 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 Right Ans - Only conducts if forward biased
(VAVG= VPEAK x .636)
Output: pulsating DC
Half Wave rectifier freq Right Ans - Ripple req: same as input freq
Full wave rectifier freq Right Ans - Ripple freq: twice input freq
With half VPEAK output
Bridge rectifier freq Right Ans - Ripple freq: twice input freq
Output: twice the voltage of a fullwave
Applied voltage is taken across the full potential of the transformer Right
Ans - Advantage of a Bridge vs Fullwave
Voltage regulators purpose Right Ans - Adjust voltage to maintain Eout at a
constant level
, Zener diode normal operation Right Ans - Fwd biased: low ohms
Rev biased: high ohms
Zener diode Right Ans - Series voltage regulator
Efficiency of a full wave vs half wave Right Ans - Full wave is more efficient
because an output is developed for entire wave form
Purpose of a series volt regulator Right Ans - Maintain constant output
voltages to a load
series volt regulator Right Ans - Load current increases, r1 square root = er
square root
Eout increases, DC increases (OR current of load square rooted) Right Ans -
In a Parallel volt regulator...
rev bias Zener Diode Right Ans - Rev bias when anode (+) is more - than
cathode (-)
In a zener reg.. Q1 Fwd bias increases when ___ ___ ___. Right Ans - load
current increases
Q1 maintains output voltage level Right Ans - In a variable volt regulator...
input V increases, Q1s voltage increases Right Ans - In a variable volt
regulator...
reverse biasing an SCR with a multimeter Right Ans - Put meters negative
port on anode
Current is applied by jumper cables from anode to gate Right Ans - How to
check an SCR gate
Polarized Outlet Right Ans - Ensures hot wire is not common to chassis and
isolates the circuit from AC line
Voltage doubler Right Ans - When in need of high volt and low current
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