Related Questions

The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
A Tempering
B Normalising
C Annealing
D None of these
Which of the following heat treatment processes is used for softening the hardened material?
A Normalising
B Tempering
C Annealing
D None of these
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
A 0.02
B 0.2
C 0.35
D 0.5
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
The percentage of carbon in grey iron castings usually varies between
A 0.5 to 1%
B 1.2%
C 2.5 to 4.5%
D 5 to 7%
The heat treatment process applied to cold formed steel parts is
A Normalising
B Tempering
C Artificial ageing
D Solution annealing
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

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