(f) Quiz on Energy Conservation

(f) Quiz on Energy Conservation

1.	The boiler manufacturer has specified that their boiler must operate with no more than 3000 ppm (part per million) of solids in the drum water. If the solids content in the condensate feed to the boiler is 150 ppm, what is the minimum boiler blowdown necessary to meet the boiler manufacturer’s specification?
	a.2%
	b.10%
	c.20%
	d.None of the above.
2.	A deaerator consumes exhaust steam and thus increases the fuel that must be burned in the boilers. .
	a.True.
	b.False.
3.	The three critical parameters for good combustion are time, temperature and turbulence.
	a.True.
	b.False.
4.	A deaerator removes air and gases from the boiler feed water, improves boiler steam production by providing hotter boiler feed water, and can recover the heat in excess exhausr that might otherwise be lost.
	a.True.
	b.False.
5.	If saturated live steam at 250 psig is throttled for use as make-up to the exhaust system, will the make-up exhaust be:
	a.Saturated.
	b.Superheated.
	c.Contain condensate.
6.	If a turbine, operating on 250 psig live steam, was designed to operate with 20 psig exhaust, but instead is operated with 15 psig exhaust. How would the actual water rate achieved compare to the design value?
	a.It would be higher.
	b.It would be lower.
	c.It would be unchanged.
7.	Generally, the more stages a turbine has, the higher will be the turbines water rate.
	a.True.
	b.False.
8.	The higher the live steam pressure to a turbine, the greater will be the turbine’s thermodynamic efficiency.
	a.True.
	b.False.
9.	The thermodynamic efficiency of a simple turbine is about 80%
	a.True.
	b.False. (about 50 to 60 %).
10.	A steam turbine operates on superheated steam. Is it possible that the exhust from this turbine could contain water?
	a.Yes.
	b.No.
11.	To produce saturated live steam at a pressure of 400 psig requires about twice the heat required to produce saturated live steam at 200 psig.
	a.True.
	b.False. (about 1205 btu/lb vs 1200btu/lb)
12.	An unsaturated quadruple effect is used to concentrate 100 tons/hour of a 12 Brix sugar solution to 60 Brix syrup.How much vapor will the condenser on the fourth effect have to condense?
	a.15 tons steam/hour.
	b.20 tons steam/hour.(water to be evaporated 80 ton, each effect, 20 ton/hr)
	c.25 tons steam/hour.
	d.40 tons steam/hour. e.None of the above.
13.	In question 12 above, what is the Brix of the juice leaving the second effect?
	a.12.
	b.15.
	c.20.(brix= 12/60 x100 = 20)
	d.30.
	e. None of the above.
14.	The calandrias of evaporators must be vented or the evaporators will eventually stop boiling.
	a.True.
	b.False.
15.	The use of triple effect evaporator always requires more heating surface than a single effect evaporator.
	a.True.
	b.False.
16.	Air compressor intakes should be installed in __________location possible.
	a.coolest (to reducepower requirment.
	b.warmest.
	c.any available.
17.	Insulating steam lines can reduce heat loss by approximately .
	a.50%
	b.75%
	c.95%
18.	The largest steam user in the plant is typically.
	a.the white sugar pans.
	b.the low grade pans.
	c.the evaporators.
19.	The quantity of heat required to raise the temperature of 1 lb of water 1 degree F is called the latent heat of water. .
	a.True
	b.False.(Sensible heat in btu)
20.	Vapor recompression can be economical up to a compression ration of around 2
	a.True.
	b.False.
21.	The purpose of a superheater is to raise the feedwater temperature to the proper temperature before pumping it into the boiler.
	a.True.
	b.False. 23.High efficiency electric motors are generally cost effective.
22.	If an evaporator evaporates 1.8 lb of water for every pound of steam that it uses, the evaporator is likely a ___________effect evaporator.
	a.single.
	b.double.
	c.triple.
23.	High efficiency electric motors are generally cost effective.
	a.True.
	b.False.
24.	Raising the Brix of the liquor leaving a triple effect fine liquor evaporator from 65 to 72 Brix will yield substantial steam savings.
	a.True.
	b.False.



	last updated 10/30/2017