Power engineering 4th class unit 11 chapter 4 with complete solutions

Power engineering 4th class unit 11 chapter 4 with complete solutions Electric boilers a) require tall stacks for pollution dispersal b) tend not to be very compact c) require sootblowers when fuel is coal d) have energy conversion efficiencies close to 100% e) are not as safe as other boilers D Electric boilers: 1) Are low pressure boilers only 2) Do not need gauge glasses 3) Do not need a chimney 4) Are economical in power consumption 5) Are hot water boilers only 3 The electrode type boiler: 1) Cannot have a varying load 2) Must operate at very constant pressure 3) Utilizes bundles of electric elements 4) Requires water which conducts electricity 5) Will produce hydrogen by electrolysis of water 4 A main disadvantage of an electric boiler is a) they are not very compact b) furnace refractory tends to be high maintenance item c) vibration requires special footings d) input energy cost is high e) energy transfer efficiency is low D one disadvantage of an electric boiler is that it: 1) Requires alternating current 2) Requires DC power 3) Has no chimney 4) Is not very efficient