JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD III .B.TECH – I SEM REGULAR EXAMINATIONS JANUARY- 2010 ELECTRICAL AND ELECTRONICS ENGINEERING (CIVIL ENGINEERING) Time: 3hours Max.Marks:80 Answer any FIVE questions All questions carry equal marks --When three inductances of values L1, L2 and L3 Henries are connected in series. Prove that Lequivalent = L1 + L2 + L3. In and A.C circuit, containing pure inductance, the voltage applied is 110V, 50Hz while the current is 10A. Find the value of inductive reactance and inductance. [8+8] A 4-pole, long shunt, lap wound generator supplies 25 KW at a terminal voltage of 500 V. The armature resistance is 0.03 ohms, series field resistance is 0.04 ohms and shunt field resistance is 200 ohms. The brush drop may be taken as 1 V. Determine: a) The EMF generated b) Cu – Losses & iron Losses c) Efficiency at Full load. [16]
3.
A 11000/230 V, 150 KVA, 1-phase, 50 Hz transformer has core loss of 1.4 kW and full load copper loss of 1.6 kW. Determine. a) KVA load for maximum efficiency and value of maximum efficiency at unity power factor. b) The efficiency at half full load at 0.8 power factor leading. [16]
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State the advantages and disadvantages of using short-pitch winding and distributed winding in alternator. Deduce the relation between the number of poles, the frequency and the speed of rotation in alternator. [8+8]
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Explain the different methods of supporting the moving system in instruments. Explain the advantages and disadvantages of different damping systems. [8+8]
6.
The turn’s ratio of the transformer used in a half-wave rectifier is 2:1 and the primary is connected to 230 V, 50 Hz power mains. Assuming the diodes to be ideal, determine a) D.C voltage across the load, b) PIV of each diode and c) Medium and average values of power delivered to the load having a resistance of 200 Ω. Also find the efficiency of the rectifier and output ripple frequency. [16]
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Explain the following: a) Firing angle. b) Conduction angle of an SCR and c) Once the SCR is triggered, the gate looses its control.
[16]
What happens to an electron when it is exposed to parallel electric and magnetic fields? Explain. In a vacuum diode, the spacing between the parallel plates of cathode and anode is 5 mm and the potential difference is 250 V. Calculate the time taken by the electron, with an initial velocity of 1 x 106 m/s, to travel from cathode to anode. [16]
of 500 V. The armature resistance is 0.03 ohms, series field resistance is 0.04 · ohms and shunt field resistance is 200 ohms. The brush drop may be taken as 1 ...
b) State the characteristics of an ideal crusher. c) Discuss the characteristics of comminuted particles. [4+4+8] · 4.a) Write about the construction and working of a ...
b) Write in detail the classical theory of diamagnetism. [8+8] · 5.a) Explain Fermi-Dirac distribution for electrons in a metal. Discuss its variation · with temperature.
6.a) List three basic requirements for a good rolling lubricant. b) A 300 mm wide aluminum alloy strip is hot-rolled in thickness from 20mm to · 15mm. The rolls ...
[8+8] · 2. (a) Describe the concept of automation in Machine Tools with examples. ... [8+8] · 5. (a) Describe the design and fabrication of automated flow lines.
6.a) Discuss the relative requirements of foundry furnaces suitable for melting Alluminium · and Copper alloys. b) Why is not the cupola furnace used for melting ...
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7) a) With the help of P-V and T-S diagrams, show that for the same maximum · pressure and temperature of the cycle and the same heat rejection thermal.
b] A project consists of six activities (Jobs) designated from A to F, with the · following relationships. ... C Follows D but precedes F. ... Write the names · and sizes ...
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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD. II .B.TECH âII SEM SUPPLEMENTARY EXAMINATIONS JANUARY- 2010 · SWITCHING THEORY AND LOGIC DESIGN · (COMMON TO ECE, ETM) · Time: 3hours · Max.Marks:80 · Answer any FIVE questions · All questions ca
Derive the equation for the viscosity. ... motion. Calculate the friction drag on one side of the plate. .... Derive an equation for computing the heat loss per.
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b) Maintainability distributions ... 5) Define maintainability distributions and explain the different types of ... Explain reliability and maintainability trade off. [16].
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1.a) What are the improvements in 8086 over the 8085 microprocessor? Explain in · detail. b) What are the different directives in 8086 programming? Explain each one of · them with an example. 2.a) Determine the memory location addressed by the follow
