With suitable diagram, explain line and phase quantities in delta connected system. Three inductive coils, each with a resistance of 15 ohm. and in inductance of 0.03H are connected in star to 3-phase 400V, 50Hz supply. Calculate (i) Phase current and line current and (ii) total power absorbed.
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Code No. 210552 II B.Tech. I-Semester Supplementary Examinations, November 2003 PRINCIPLES OF ELECTRICAL ENGINEERING AND NETWORKS (Computer Science and Engineering) Time: 3 hours Max. Marks: 70 Answer any Five questions All question carry equal marks --1.a) Derive an expression for determination of RMS value of sine wave. b) A resultant current wave is made up of two components: direct current of 10A and sinusoidal alternating current of 50 Hz, with peak value of 10A. (i) Calculate the average value of current of the resultant wave over one complete cycle. (ii) Determine the rms value of current of the resultant wave.
Explain the constructional details of DC machines. Develop a general expression for the resistance of a direct current armature winding with z-conductors each of the length L (including overhang ) and cross section S arranged in a pairs of circuit and P pole pairs. The resistivity of the winding materials is P.
4.a) b)
Derive the torque equation of a dc motor. A shunt generator delivers 40 kw at 240V when running at 450 rpm. The armature and field resistances are 0.03 ohm. And 60 ohm respectively. Calculate the speed of the machine running as a shunt motor and taking 40 kw input at 240V. Allow 1V per brush for contact drop.
5.a) b)
Derive an equivalent circuit for a single phases transformer. A 6600/400 V , 50 Hz , single phase core type transformer has a net crosssectional area of the core of 428 cm2. The maximum flux density in the core is 1.5 tesla. Calculate the number of tutns in a primary and secondary windings.
6.a)
Explain with the help of diagrams how a rotating magnetic field is produced in the air gap of a 3-phases induction motor. The voltage applied to the stator of a 3-phase, 6-pole induction motor has a frequency of 50 Hz. The frequency of the emf induced in the rotor is 2 Hz. What is the slip and at what speed is the motor running.
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Code No. 210552
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OR
State and explain the superposition theorem. Calculate the current in the 2 ohm. resistor of given below diagram using thevenin’s theorem.
8.
Write short notes on the following: (a) DC motors starter (b) Efficiency and regulation of single phase transformers (c) Maximum power transfer theorem
Code No. 210552 II B.Tech. I-Semester Supplementary Examinations ...
armature and field resistances are 0.03 ohm. And 60 ohm ... 6.a) Explain with the help of diagrams how a rotating magnetic field is produced in · the air gap of a ...
starter, (iii) Auto transformer starter limiting the supply line starting current to · twice the full-load value. Find the auto-transformer tapping in this case. - - -.
c) A simple Delavel steam turbine nozzle ring is supplied with 200 kg/hr of dry · steam at 10 ... iii) The dryness of steam just as it leaves the turbine rotor blading.
a) Follower moves outwards through 40mm during 60° of cam rotation. ... Draw the profile of the cam when the axis of the follower is offset 20mm towards.
SIMULA. b) What is concurrency ? Briefly explain the concurrency features in ADA. 8. Briefly explain the following : · (a) · Basics of LISP · (b) · Type equivalence.
Code No: 220155. II-B.Tech. II-Semester Supplementary Examinations, April/May-2004 · PROBABILITY AND STATISTICS · (Common to Civil Engineering, Mechanical Engineering, Production ... b) If X is normally distributed with mean 8 and S.D 4, find ... 3.a
b) Explain the concept of Tunnel diode in detail. Draw and explain its ... voltage for a P channel JFET with a=2Ã10-4 cm and channel resistively · Ï=10ohm-cm.
State the second law of thermodynamics and explain how it is applied for · development of heat engine. 6. A reversible heat engine absorbs 252 kcal at 260°C, ...
b) Describe MOTT & WHEELER method of test Coke. 2.a) Describe a method for the manufacture of producer gas. b) Mention important properties and uses of ...
1.a) Explain the star-delta transformation. b) Using mesh analysis, find the currents in all the branches of the network given · below. 2.a) Explain Lenz's law and ...
Derive the equation for steady-state heat transfer through a spherical shell of inner · radius r1 and ... C and the outer wall of the annulus is insulated. Neglecting ...
1.a) Explain with a neat sectional view the operation and advantages of hot blast · cupola. b) Discuss the various types of refractories used for cupola lining.
5.a) What is sine bar. Sketch an arrangement for any one of the applications. b) Describe the constructional features and working of optical collimator.
Polynomials in single variable are stored in the form of linked lists. Each · structure has space for one coefficient and one exponent and a link. Assume.
b) With the help of a neat sketch of psychometric chart show the various psychrometric · processes naming them clearly. c) Explain what effective temperature is ...
b) State the method of manufacturing and special qualities of the following bricks. (i) sand â lime bricks (ii) Fly ash bricks (iii) Stabilised bricks. c) Explain briefly ...
the following (with comments and indentation) · a) To read the ... OR. Develop a complete COBOL program with indentation and comments to do the · following:.
... shown below. Take node 4 as reference · node. 7.a) Obtain the relation between Y and Z parameters. b) Find A B C D parameters of the network shown below.
320256. III-B.Tech. II Semester Supplementary Examinations December 2002/January 2003 · MODELLING OF POWER SYSTEM COMPONENTS · (Electrical and Electronics Engineering) · Time: 3 hours · Max. Marks: 70 · Answer any FIVE questions · All questions carry
10 kVA at 0.8 pf lagging, load B draws 15 kW at a 0.5 pf lagging and load C · dissipates 5 kW at unity pf. (i) Find active power, reactive power and line current.
Code No:220352. II.B.Tech II-Semester. Supplementary ... not to exceed 90 N/mm · 2 · and (ii) The maximum shear stress is not to exceed 45 · N/mm · 2 . Tube.
