Another name of variable speed drive (VSD) isQuestion 7Answera.Variable Voltage/Variable Frequency (VVVF)b.Direct Torque Control (DTC)c.Field Orientated Control (FOC)d.Variable Frequency Drive (VFD)

VFD stands for variable frequency drive. When used in HVAc equipment and appliances they reduce noise, use less energy, and _________ a. can match the system demand b. eleminate motor line starting shock c. eleminate short cycling d. all are correct

The setting for the speed of a VSD is known as which of the following:Question 2Select one:a.Setpointb.Speed Pointc.Control Pointd.All of the above are common names for the speed setting.e.Reference

Variable speed drives loads are the ______ type of loads. Constant current Constant impedance Constant Power ZIP load

The controller for a VFD uses microprocessors to switch on and off the wave form. The longer the switch is on the higher the output voltage will be. The speed at which the device switches on and off is referred to as _________ a. switch speed b. carrier frequency c. modulation speed d. reciprocation frequency

In __________ transmissions can be four or six speeds.rear wheel drivefront wheel drivefour wheel drivepassenger carsCVT