Related Questions

In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.
A Same
B Less
C Greater
D None of these
Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.
A Chromel - alumel
B Iron - constantan
C Platinum - platinum + rhodium
D Copper-constantan
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
Heat flux, as defined in heat flow is analogous to __________ in electricity flow.
A Current
B Voltage
C Resistance
D None of these
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
A Copper
B Steel
C Aluminium
D Brass
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
A 250
B 500
C 750
D 1000
Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.
A True
B False
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
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
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
A 1 n-mho
B 106 mho
C 1 milli-mho
D None of the above

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