Related Questions

Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
A 5-10
B 15-20
C 30-35
D 35-40
During which of the following process does heat rejection takes place in Carnot cycle?
A Isothermal expansion
B Isentropic expansion
C Isothermal compression
D Isentropic compression
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
If Q is load factor, S is shape factor and F is factor of safety in elastic design, the following:
A Q = S + F
B Q = S - F
C Q = F - S
D Q = S × F
বুদ্ধির ক্ষেত্রে চালর্স স্পিয়ারম্যান কোন কোন ধরনের সামর্থ্যের কথা উল্লেখ করেছেন? i. e-factor ii. g-factor iii. s-factor নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
Causes of acute graft rejection are
A Antibody mediated
B Cell mediated
C T-cell dependent
D Irreversible
E Seen after first six months
Hyperacute rejection of grafts
A May be minimized by matching blood group
B Mediated by preformed antibodies
C Occurs within 2-4 days of transplantation
D Associated with T-cell mediated reaction
E Occurs in autograft

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