Explain why a lubricant with high viscosity index would be beneficial for an application with a wide operating temperature range.
What will be an ideal response?
Viscosity index is the measure of oils stability with changes in temperature. A high viscosity index means that its viscosity does not change much with an increase or decrease in temperature. Maintaining the oil viscosity with a wide operating temperature can reduce wear compared to oil with a low VI.
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The motor is driven by a slip energy-recovery system. The triggering angle of the dc/ac converter is adjusted to 120o . Calculate the following:
A three-phase, four-pole, Y-connected, 480 V induction motor is driving a 400
Nm constant-torque load. The motor has the following parameters:
a. Motor speed
b. Current in the dc link
c. Average voltage at the input of the dc/ac converter
d. Rotor rms current
e. Stator rms current
f. Power returned back to the source
The recommended number of 8d finish nails used to fasten each tread to the riser below it is _____
a. two b. three c. four d. five
The compressor in an existing split system is being replaced. The system has a 35 ft line set. The factory charge for the condensing unit is 80 oz. The installation instructions state that the factory charge assumes a line length of 15 ft and gives the per-ft adjustment as 0.6 oz per foot. How much refrigerant should be added to the system after the system has been evacuated?
A) (35 — 15 ) × 0.6 = 12 oz B) 80 oz + ((35 — 15 ) × 0.6 ) = 92 oz C) 80 oz D) 80 oz + (35 × 0.6 ) = 101 oz