B.TECH - Semester 3 hydraulic machines and heat engines Question Paper 2020 (feb)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- State the Newton's Law of viscosity and explain Newtonian and Non-Newtonian fluids.
- Explain the terms Specific weight, Surface tension and specific gravity.
- Obtain the condition for maximum power transmission through a pipe line.
- What is the role of Surge tank in hydroelectric power plant installations?
- Explain the advantages of using Air vessels in Reciprocating pump.
- What are different heads and efficiencies of centrifugal pump?
- Define Specific speed of a turbine .What is the significance of specific speed?
- What is the advantage of intercooling in two stage compressor?
- What are the methods of governing a Steam turbine?
- Define mean effective pressure of an IC Engine. Distinguish between IMEP and BMEP.
- (a) Derive Euler's equation of motion along a stream line and hence derive the Bernoullis Theorem. List the assumptions made.
- (b) An oil of specific gravity 0.85 and viscosity 0.05 poise flows through a 20 cm diameter pipe at the rate of 75 litres per second. Find the head loss due to friction for a 500 m length of pipe. Also calculate the power required to maintain the flo...
- (a) Derive the Hagen-Poiseullie equation and state the assumptions made.
- (b) The inlet and throat diameters of a horizontal venturimeter are 40 cm and 20 cm respectively. The liquid flowing through the meter is water. The pressure intensity at inlet is $15.934 \mathrm{~N} / \mathrm{cm}^{2}$, while the vacuum pressure head...
- (a) Derive an expression for hydraulic efficiency of a Pelton Wheel in terms of peripheral velocity, jet velocity and the blade angle. Proceed / Further to get the best bucket speed for maximum hydraulic efficiency.
- (b) The penstock supplies water from a reservoir to a Pelton wheel with a gross head of 500 mm . One third of the gross head is lost in the friction in the penstock. The rate of flow of water through the nozzle fitted at the end of penstock is $2.0 \...
- (a) Define Specific speed of a Turbine. Obtain the expression for Specific speed. What is its significance?
- (b) A single acting reciprocating pump has a piston diameter 110 mm and stroke length 250 mm . The length and diameter of the suction pipe are 7 m and 60 mm respectively. If the suction lift of the pump is 4 m and separation occurs when the pressure ...
- (a) Explain in detail the effect of inter coding in the performance of closed cycle gas turbine.
- (b) A gas turbine unit has a pressure ratio of $6: 1$ and maximum cycle temperature of $650^{\circ} \mathrm{C}$. The isentropic efficiencies of the compressor and turbine are $80 \%$ and $83 \%$ respectively. Calculate the power output in KW of an el...
- (a) Derive an expression for the optimum pressure ratio for maximum specific work output of a gas turbine power plant.
- (b) A single cylinder four-stroke diesel engine running at 1500 r.p.m has a bore diameter of 90 mm and stroke length of 100 mm . It takes 0.60 kg of air per minute and develops a BP of 6.5 kw . While the air fuel ratio is $20: 1$. The calorific value...
- (i) The volumetric efficiency (ii) Brake Specific fuel consumption