ATT TEST 8 QUESTIONS AND ANSWERS 2025

ATT TEST 8 QUESTIONS AND ANSWERS 2025




Parts of a power supply - (ANSWER)Input, rectifier, filter, regulator, protection



Optional parts of a power supply - (ANSWER)Regulator and protection



Purpose of a power supply - (ANSWER)To convert AC power into smooth DC power



Function of the input in a power supply - (ANSWER)Step up or down the AC input voltage



Function of the rectifier in a power supply - (ANSWER)Changes AC into pulsating DC



Function of the filter in a power supply - (ANSWER)Changes pulsating DC into smooth DC



Components used by filters - (ANSWER)Reactive components



Function of the regulator in a power supply - (ANSWER)Maintains the output voltage at a constant level
despite changes in load current



Function of the protection circuit in a power supply - (ANSWER)Prevents damage to power supply if load
becomes faulty, limits or disables output



Half wave rectifier equivalent circuit - (ANSWER)Series limiter



Least efficient rectifier using only half the input - (ANSWER)Half-wave



Rectifiers requiring two input signals 180 degrees out of phase - (ANSWER)Full-wave and bridge



Rectifier using a center tapped transformer - (ANSWER)Full wave

, ATT TEST 8 QUESTIONS AND ANSWERS 2025




Frequency determination for half wave rectifier - (ANSWER)Output frequency is same as input
frequency



Frequency determination for full wave rectifier - (ANSWER)Output is twice the input frequency



Frequency determination for bridge rectifier - (ANSWER)Output is twice the input frequency



Purpose of series voltage regulators - (ANSWER)To adjust voltage drop to maintain V out at constant
level



V out increase in series voltage regulator - (ANSWER)When load current decreases OR DC input
increases



V out decrease in series voltage regulator - (ANSWER)When load current increases OR DC input
decreases



Maintaining constant level of V out when load current decreases - (ANSWER)Increase R1 resistance to
increase voltage drop on R1



Maintaining constant level of V out when load current increases - (ANSWER)Increase R1 resistance to
decrease voltage drop on R1



Purpose of parallel voltage regulator - (ANSWER)Adjust current flow to maintain V out at constant level



V out increases in parallel voltage regulator - (ANSWER)DC input increases or load current decreases



V out decreases in parallel voltage regulator - (ANSWER)When DC input decreases or load current
increases