Which split-phase motor has the lowest starting torque?
A. PSC
B. CSIR
C. CSCR
D. three-phase
Answer: A
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An existing Rankine heat engine has been operating with an overall efficiency of 15% for some months. The efficiency today is only 13%. Which of the following process upsets is NOT a possible explanation for the decrease in efficiency?
A. Operators allowing the controls to drift B. Calculation mistakes when designing C. Fouling (hard water minerals) buildup on the boiler D. Loss of lubrication on the turbine bearings E. Pump impeller wear
Describe how plastic mulch could be used in a landscape
What will be an ideal response?
One advantage of using the 2's-complement system to represent signed numbers is:
A) division can be accomplished by performing multiplication. B) subtraction can be accomplished by performing addition. C) addition can be accomplished by performing subtraction. D) multiplication can be accomplished by performing division.
A common model for a practical capacitor has a “leakage” resistance, RC , in parallel with an ideal capacitor, as shown in Figure P4.67. The effects of lead wires are also represented by resistances R1 and R2 and inductances L1 and L2.
a. Assume C = 1?F, RC = 100 M?, R1 = R2 = 1??, and L1 = L2 = 0.1?H, and find the equivalent impedance Zab seen across terminals a and b as a function of frequency ?.
b. Find the range of frequencies for which Zab is capacitive.
[Hint: Assume that RC is much greater than 1/?C such that RC can be ignored in part b.]
