Asked to find volumetric flow rate of gas - what equation could you use? Correct Answer: PV=mRT -
Pv=RT - V(rate) = m(rate)*R*T/P====remember
... [Show More] v=V(rate)/m(rate)
How do you calculate feet of air from inches of H20? Correct Answer: Convert inches of H20 to feet
of H20 and then multiply by (density water/density air) - counterintuitive.
What is a good way of manipulating the equation for velocity through a pitot tube in handbook?
Correct Answer: v=(2g(p0-p1/y))^1/2 can be changed to v= (2gh)1/2
How do you find the dew temp of a coil apparatus? Correct Answer: Extend the coil load line to the
saturation temperature point
Difference between cogeneration and Rankine with regeneration? Correct Answer: Cogeneration
sends extract steam to a process heater, and Rankin regeneration sends extract steem to a feed
water heater
Does stoichiometric combustion equation include excess air? Correct Answer: No
How is turbine efficiency calculated? Correct Answer: Actual Work/Isentropic Work, Ti-Te/Ti-Tes, hihe/hi-hes
How do you find Brayton cycle temps after compressor and turbine phases? Correct Answer: Assume
isentropic compression and isentropic expansion, use constant entropy temp, pressure ratio
equations. Think use of k.
Equation for psychometric mixtures of air? Correct Answer: tmix = (t1*CFM1 + t2*CFM2)/(CFM1 +
CFM2)
How do you find psychometric properties of mixed air? Correct Answer: Plot airstream 1 and
airstream 2 on psychometric chart, draw vertical line a dry bulb temp - read properties at intersection.
Given pump head in pressure what is the equation for pump bhp? Correct Answer:
massflow*specificvol*deltaP, or Q(volflow)*deltaP
Knowing the pump bhp, what is the equation for shaft power? Correct Answer: shaft power =
bhp/pump efficiency
How do you calculate change in potential energy? Correct Answer: convert E=mgh/g to
E=massflow*g*h/g
what is the primary assumption in solving parallel pipe flow problems? Correct Answer: head loss in
all branches are equal. Set darcy weisbach equations equal to each and cancel out constants,
remember flow is proportional to velocity.
What is trick about calculating the Carnot Cycle efficiency? Correct Answer: Temperature must be in
absolute.
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