Related Questions

Direct conversion of heat into electrical energy is possible through
A fuel cells
B solar cells
C MHD generators
D none of the above
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
A Resistance
B Arc
C Low frequency induction
D None of these
Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
A Fusion
B Vaporisation
C Transition
D None of these
Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of
A Sublimation
B Fusion
C Transition
D Vaporisation
Direct conversion of chemical energy into electrical energy is done in a
A Magnetohydrodynamic (MHD) generator
B Fuel cell
C Fast breeder reactor
D None of these
Pick out the wrong conversion formula for the conversion of weight units :
A 1 tonne = 1000 kg = 22.046 lbs
B 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D None of these

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