In a simple impulse turbine, the nozzle angle at the entrance is 30°. For maximum diagram efficiency,the blade speed ratio will be ________.
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Solution
The knocking tendency in compression ignition enginer increases with:
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Solution
In compression ignition enginer,higher compression ratio reduces the tendency of knocking due to the a very little delay period
The relation \(\frac{\partial ^{2}\phi }{\partial x^{2}}+\frac{\partial ^{2}\phi}{\partial y^{2}}=0\) for an irrotational flow is termed as :
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Solution
Relation \(\frac{\partial ^{2}\phi }{\partial x^{2}}+\frac{\partial ^{2}\phi}{\partial y^{2}}=0\) is known as Laplace equation for an irrotational flow.
A pens tock of 10 m diameter carries water under a pressure head of 100 m. If the wall thickness is 9 mm, the tensile stress in pipe wall will be ________. (Take g = 10 m/s2)
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Solution
Air conditioning has to be done for a hail whose RSH= 50 kw and RLH= 50 kw. There are no other sources of heat addition or leakager. The value of RSHF will be ________.
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Solution
When the Brayton cycle working in the pressure limits of P1 and P2 is reversed and operated as a refrigerator, the ideal value of CoP for such a cycle will be:
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Solution
In a counter flow heat exchanger, the hot fluid is cooled from 110°C to 80°C by a cold fluid which gets heated from 30°C to 60°C. LMTD for heat exchanger is ________.
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Solution
Given: Temperature difference (ΔT1) = 110 – 60 = 50°C
Temperature difference (ΔT2) =80 – 30 = 50°C
Now, Logarithmic Mean Temperature Difference:
Air can be best heated by steam in a heat exchanger of
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Solution
In a heat exchanger, air can be best heated by steam by using double pipe type with fins on air side because heat transfer coefficient of liquid has more value than that of the gas.
Vander waal’s equation of state is given by \(\left ( P+\frac{a}{V^{2}} \right )\)(V –b) = RT. The constant b in the equation in terms of specific volume at critical point Vc is equal to:
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Solution
In a polytropic process, the term \(\left ( \frac{\gamma -n}{\gamma -1} \right )\left \{ \frac{P_{1}V_{1}-P_{2}V_{2}}{(n-1)} \right \}\) is equal to:
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Solution