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
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
