# Proposed Test Protocol for Calculating the Energy Efficiency of Internal Ac-Dc Power Supplies

## Quiz Questions

 1. Devices designed to convert ac voltage into dc voltage for the purpose of powering electrical equipment is called __________________. Ac-Dc Power Supply Current Supply 2. AC signal is a time-varying signal whose polarity varies with a period of time T and whose average value is zero. True False 3. Apparent power is also called __________________. Total Power Circuit Power 4. A signal of which the polarity and amplitude do not vary with time is called DC signal. True False 5. What is UUT mean? Unit Under Test Under Unit Test Unit Under Temperature None of the above 6. A power supply designed to provide one dc voltage level or bus is called Multiple Output Power supply. True False 7. _____________________ is a power supply whose components are grouped on a single printed circuit board but are not enclosed in a case. Open Frame Modular Internal Power Supply Multiple Frame Modular Internal Power Supply 8. Any of the dc outputs of the power supply, to which loads can be connected and current and power supplied is called Output Voltage Bus. True Flase 9. ____________ is the ratio of the active, or real, power (P) consumed in watts to the apparent power (S) drawn in volt-amperes. True power factor Current supply factor 10. The ___________________ is defined as the ratio of peak current to rms current (or peak voltage to rms voltage). Crest factor Displacement factor 11. The supply voltage declared by the manufacturer in the specification of the power supply is called Rated Dc input voltage. True False 12. The dc output current range (minimum/maximum) for each output voltage bus of the power supply as declared by the manufacturer in the specification of the power supply. True False 13. The square root of the average of the square of the value of the function taken throughout the period is called __________________. Root Mean Square Output Mean Square 14. Standby mode represents the mode during which all dc power is delivered through the standby voltage rail of the power supply. True False 15. The ___________________ is the output voltage bus that is present whenever ac power is applied to the ac inputs of the supply. Standby voltage rail Power Voltage 16. The operating condition of a system wherein the observed variable has reached an equilibrium condition in response to an input or other stimulus in accordance with the definition of the system transfer function is known as a Steady state. True False 17. What does THD stand for? Total Harmonic Distortion Total Harmonic Displacement Temperature Harmonic Distortion None of the above 18. The ratio, expressed as a percentage, of the total real output power (produced by a conversion process) to the real power input required to produce it is called ________________. Efficiency Total Current supply 19. The maximum difference between rms phase to neutral or phase-to-phase voltage amplitudes at the UUT input terminals is called Rated Input Frequency. True False 20. Active dc loads such as electronic loads or passive dc loads such as rheostats used for efficiency testing of the UUT shall be able to maintain the required current loading set point for each output voltage within an accuracy of ± 0.5%. True False