The second virial coefficient (B) describes what about a system? Why is it normally negative?
What will be an ideal response?
B represents the effects of two-body interactions on the compressibility factor. These two body interactions could be dipole-dipole, induction, and dispersion forces between two nearby molecules. The coefficient is typically negative because the net effect of these forces is typically attractive, thus reducing the molar volume of a system compared to the ideal gas value.
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Besides identifying a dead cylinder, what else can a multi-cylinder cutout test identify after performing a cylinder cutout test?
A. emissions analysis B. cold engine operation C. unbalanced cylinder fueling D. all of the above
(a) A copper?75 percent silver alloy is slowly cooled from the liquid state to 900°C, and allowed to come to equilibrium. Estimate the amount and composition of both the liquid and solid phases.
(b) Make a sketch of the 900°C equilibrium structure of the alloy. (c) Now assume the alloy is slowly cooled to just below the eutectic temperature. What are the weight percentages and compositions of the phases and constituents at this point?
Technician A says that one disadvantage of disc brakes is noise. Technician B says that disc brakes are easier to equip with a parking brake mechanism than drum brakes. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
The motor is connected to 220 V supply through a cable of 1.30 ? inductive reactance per phase. At a speed of 1710 rpm, calculate the following:
A four-pole, 60 Hz, Y-connected, squirrel cage induction motor has the following
parameters:
a. Motor current and input power.
b. Terminal voltage
c. Developed torque
Also calculate the terminal voltage at starting. What is the percent change of the
terminal voltage? Can you explain the change in the terminal voltage at starting?