B.TECH - Semester 4 fluid machinery Question Paper 2022 (dec)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- (b) What are the conditions for maximum efinciency of a mulli-slage reciprocaling compressor?
- 405 : FLUID MACHINERY (M) (2013 Scheme) Time : 3 Hours Max. Marks : 100 PART - A (2 marks each. All questions are compulsory)
- What is the basis of selection of a turbine for a particular place?
- Write two main use of draf lubes.
- Define specific speed of a lurbine, Wrile the range of specific speed of Francis turbine when it is calculated on the basis of St syslem.
- Whal are the functions of casing and fool valve in a centrifugal pump?
- What are the different losses that occur during the operation of a centrifugal pump?
- Differenliale between singlæ-acling and double-acting reciprocating pump.
- What is an air vessel? What is the main funclion of air vessel?
- Why the efficiency of reciprocaling compressor is given in terms of isolhermal efliciency?
- Why capacity of a compressor is given in lerms of free air delivery?
- Define the term slip factor. $$ (10 \times 2=20 \text { Marks }) $$ (Answer one fult question out of the two from each module)
- (a) Design a Pellon wheel for a head of 80 m and speed 300 rpm . The Pelton wheel develops 103 kVW shaft power. Take $\mathrm{CV}=0.98$, speed ralio $=0.45$ and overall efficiency $=0.80$. (0) Find an expression for the efficiency of a series of movi...
- (a) A Kaplan turbine working under a head of 20 m develops 11772 kW shat power. The outer diameder of the runner is 3.5 m and huc diameder 1.75 m . The guide blade angle al the extreme enge of the runner is $35^{\circ}$. The hydraulic and overall efi...
- (i) Runner vane angles at inlet and outlet al the exlreme edge of the runner. (ii) Speed of the turbine in rons,
- (b) Derive an expression for unit discharge and unit power of a turbine. Module - II
- (a) Prove that in the case of forced vortex, the rise of liquid level at the ends is equal to the fall of liquid level al the axis of rotation.
- (b) A centrifugal pump lifts $2.4 \mathrm{~m}^{3} / \mathrm{min}$ of waler lo a height of 20 m through pipeline of 0.15 m diameter. The total length of the pipeline is 100 m , Considering an inled loss of 0.33 m assuming an overall efficiency of $70 ...
- (a) A pump is lo be located at a place where the baromeltic pressure is 98 kPa (abs). The pump has to deliver $0.15 \mathrm{~m}^{3}$ of water against 30 m head. The vapour pressure is 3 kPa (abs) and the crilical cavitalion number of the pump is 0.1 ...
- (b) Draw and discuss the operaling characterislics of cenlrifugal pump. 15 (a) A single acting reciprocaling pump has a plunger of 7.5 cm ciameter amd a stroke length of 15 cm . Il takes ils supply of waler from a sump 3 m below the pump through a p...
- (b) Draw and explain an indicalor diagram considering the effect of acceleralion in suclion and delivery pipes.
- (a) Show from first principle that the work saved, against friction in the delivery pipe of a single acting reciprocaling pump, by filling an air vessels $84.8 \%$.
- (b) Explain hydraulic ram with neal skelch, Module - IV
- (a) A single acting two-slage compressor with complete intercooling delivers $5 \mathrm{~kg} / \mathrm{min}$ of air al $15 \mathrm{~kg} / \mathrm{cm}^{2}$. Assuming an intake slate of $1 \mathrm{~kg} / \mathrm{cm} \mathrm{cm}^{2}$ and $15^{\circ} \ma...
- (a) A centrifugal compressor used as a supercherger for aulo engine handles $150 \mathrm{~kg} / \mathrm{mm}$ of air 1 bar and 209 K . The suction velocily is $80 \mathrm{~m} / \mathrm{s}$. If the compression in impeller conditions are 15 bar. 345 K a...
- (i) Isentropic efficiency (ii) Power required to drive the compressor
- (b) Describe the working of a roots blower by the help of a neat skelch and pressure volume diagram. $$ (4 \times 20=80 \text { Marks }) $$