34304. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
34305. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
34306. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
34307. Use of pulverised coal in boilers provides
34308. In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ?
34309. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
34310. Turndown ratio of a burner gives an idea of the __________ in the furnace.
34311. In low or standard frequency induction furnace, heat is produced by the
34312. Which furnace employs natural draft ?
34313. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
34314. Regenerators compared to the recuperators for the same duty
34315. Regenerators are used for waste heat recovery in
34316. Which of the following furnaces will have maximum thermal efficiency ?
34317. Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
34318. The heating capacity of muffle furnace depends on the
34319. Which of the following is a batch furnace ?
34320. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
34321. Maximum thermal efficiency of boiler may be about __________ percent.
34322. Rotary kilns are used in the
34323. The method of Lobo and Evans is concerned with the calculation of the
34324. Reverberatory furnace is used for
34325. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
34326. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
34327. Which of the following is a directly fired intermittant furnace ?
34328. Dampers are located
34329. Protective gas used in the annealing furnace for steel coil comprises of
34330. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
34331. Scaling of furnace stock is reduced by __________ in flue gas.
34332. __________ furnace is not an electric furnace.
34333. Forced recirculation of furnace gases is practised
34334. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
34335. Air filtration in a furnace
34336. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?
34337. Which of the following is a periodic furnace?
34338. Regenerators are normally provided in the
34339. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
34340. Furnace pressure is normally controlled by regulating the
34341. An example of indirectly heated furnace is the
34342. Specific heating capacity of a furnace is expressed as
34343. The main function of a muffle in the muffle furnace is to
34344. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
34345. Very high pressure boilers are usually __________ boilers.
34346. Heat transfer rate to the charge/stock in a furnace does not depend upon the
34347. Heat balance of furnace provides means of determining the
34348. Thermal efficiency of furnaces can be improved by
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