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NLC Technical Quiz 46
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Question 1
For a fluid flowing over a flat plate, the Nusselt number at a point 0.5 m from the leading edge is 100. If the thermal conductivity of the fluid is 0.025 W/mK, the coefficient of convective heat transfer is
Question 2
Match List-I with List-II and select the correct answer using the code given below the lists:
List-I
A) Radiation heat transfer
B) Conduction heat transfer
C) Forced convection
D) Transient heat flow
List-II
1) Fourier number
2) Wien’s displacement law
3) Fourier law
4) Stanton number
Question 3
A reversible engine operates between temperatures 900 k and T2(T2 < 900K) and another reversible engine between T2 and 400 K (T2>400 K) in series. The value of T2 if work outputs of both the engines are equal is
Question 4
The process of making hollow castings of non-circular shape and desired thickness by permanent mould without the use of cores is known as ____.
Question 5
In Ammonia-water VARS, water acts as
Question 6
The following readings refer to a vapour compression refrigerator:
The enthalpy per kg of refrigerant flow, from p-h chart
at inlet to compressor – 1500 kJ/kg
at outlet to compressor – 1700 kJ/kg
at exit of condenser – 300 kJ/kg
The COP of the refrigerator is
The enthalpy per kg of refrigerant flow, from p-h chart
at inlet to compressor – 1500 kJ/kg
at outlet to compressor – 1700 kJ/kg
at exit of condenser – 300 kJ/kg
The COP of the refrigerator is
Question 7
The slenderness ratio for long columns is:
Question 8
The COP of a refrigerator working on a reversed Carnot cycle is 5. The ratio of the highest absolute temperature to the lowest absolute temperature would be
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