Download Model question papers & previous years question papers
|
Posted By: kondapalli Member Level: Gold Posted Date: 05 Jun 2008
|
2007 Jawaharlal Nehru Technological University B.Tech Applied Electronics and Instrumentation PRIME MOVERS AND MECHANICAL MEASUREMENTS setno1 Question paper
|
|
|
1. (a) Explain the following associated with velocity triangles of turbines:
i. Velocity of flow
ii. Velocity of whirl
iii. Blade angle
iv. Peripheral velocity of blade.
(b) The diameter of the runner of a Francis turbine at inlet is 3m and the breadth
of openings at inlet is 0.9m. The flow leaves the runner radially and the blade
angle is obtuse. At what angle the wicket gates of a Francis turbine be set to
extract 8000 Kw of power from a flow of 30 cum /sec when running at a speed
of 200 rpm. [8+8]
2. (a) Why will the centrifugal pump function only when started at or above mini-
mum speed?
(b) The centrifugal pump discharges 0.2 m3/sec against a head of 25m running at
1400 rpm. The outer diameter of impeller is 25 cm and outer width is 4 cm.
Determine the vane angle at outlet if manometric efficiency is 80%. The blade
is backward facing. [6+10]
3. (a) What are the essential features of a good boiler?
(b) Compare the water tube and fire tube boilers on different aspects. [8+8]
4. (a) Show that the thermal efficiency of a regenerative cycle is always higher than
that of a simple Rankine cycle.
(b) A Carnot engine works between the pressures of 28 bar and 0.15 bar using
steam as working fluid. Dry-saturated steam is supplied to the engine. Find
the work done and thermal efficiency of the engine. Also find the dryness
fraction of steam at the end of isentropic expansion and at the beginning of
isentropic compression. [8+8]
5. (a) Explain the working principle of reheating gas turbine power cycle?
(b) What are the required conditions for the gas turbine power plant? Explain?
[8+8]
6. Derive an expression for the flow rate of an incompressible fluid through a variable
head flow meter. Define the nomenclature used and state clearly the assumptions
made. What modifications are required to be made in the above result to make it
equally applicable for the measurements of compressible flows? [16]
7. (a) Differentiate between LVDT and piezo-electric accelerometers.
(b) Explain the principle and working of multi-lever system for weighing. [6+10]
8. (a) Sketch the schematic arrangement of an oscilloscope for frequency and phase
measurements and explain its working principle.
(b) An oscilloscope displays a sine wave and the distance between the first and
fourth peaks is found to be 5.4cm. If the time base setting is 20 x 10 -03 make
calculations for the periodic time and frequency of the sine wave. [8+8]
Return to question paper search
|
|
|
Submit Previous Years University Question Papers and
make money from adsense revenue sharing program
Are you preparing for a university examination? Download model question papers
and practise before you write the exam.