Ask Question, Ask an Expert


Ask Electrical & Electronics Expert

1) The tank of a 1250 KVA natural oil cooled transformer has the dimensions of length, width and height as 1.55m x 0.65m x 1.85m respectively. The full load loss is 13.1 kw. Determine the  and ampere conductors per metre as  flux density 1wb/m2 number of tubes for this transformer assuming: W/m2°C due to radiation = 6 and due to convection = 6.5. Improvement in convection due to provision of tubes = 40% temperature rise = 40°C. Length of each tube = 1m and diameter of tubes. Neglect the top and bottom surfaces of the tank as regards cooling.

2) Approximate the stator core dimensions, number of stator slots and number of the stator conductors per slot for a 100 kw, 3300v, 50 Hz, 12 pole star connected slip ring induction motor. Assume average gap density = 0.4 wb/m2 efficiency = 0.9, power factor = 0.9 and winding factor = 0.96 choose main dimensions to give overall design.

3) A 3 phase, 6 pole, 50Hz, 10kw, 220v star connected Induction motor has 54 stator slots each containing 6 conductors. Determine the values of bar and end ring currents. The number of Rotor bars is 64. The machine has an efficiency of 0.86 and a power factor of 0.85. The rotor mmf may be assumed as 85% of stator e.m.f. Also determine the bar and end ring sections if the current density is 5A/mm2

4) a) Deduce the output equation of the salient pole synchronous machine.

b) describe the several factors affecting the choice of short circuit ratio.

5) The field coils of a salient pole alternator are wound with a single layer winding of bare copper strip 30mm deep with separating insulation 0.15mm thick. Determine a suitable winding length, number of turns and thickness of conductor to develop an mmf of 12,000 A with potential difference of 5v per coil and with a loss of 1200 w/m2 1.2m. The resistivity of copper is 0.021?/m and mm2; Conductors per metre = 25,000 A/m of total coil surface. The mean length of turn is.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913085

Have any Question? 

Related Questions in Electrical & Electronics

1 what is the propagation vector interpret the significance

1. What is the propagation vector? Interpret the significance of its magnitude and direction. 2. Discuss how the phase constants along the coordinate axes are less than the phase constant along the direction of propagati ...

The electric and magnetic fields of a uniform plane wave

The electric and magnetic fields of a uniform plane wave propagating in a perfect dielectric medium are given by Find the permittivity and the permeability of the medium.

A current distribution is given bywhere j0 is a constant

A current distribution is given by where J 0 is a constant. Using Ampere's circuital law in differential form and symmetry considerations, find the magnetic field everywhere.

Question what is the thevenin theorem or

Question: What is the thevenin theorem or steps

The power output of a hydraulic turbine depends on the

The power output of a hydraulic turbine depends on the diameter D of the turbine, the density ρ of water, the height H of water surface above the turbine, the gravitational acceleration g, the angular velocity ω of the t ...

Afirst-order ltic system has a characteristic root lambda

A first-order LTIC system has a characteristic root λ = -10 4 . a. Determine T r , the rise time of its unit step input response. b. Determine the bandwidth of this system. c. Determine the rate at which the information ...

1 a determine the transfer function vosv1 s for the circuit

1. (a) Determine the transfer function Vo(s)/V1 (s) for the circuit shown below. (b) From the transfer function identify what type of filter it is. (c) Justify your answer of part b 2. (a) Draw the circuit of a free runn ...

A 9 kva 208 v l-l 3-phase y connected stator synchronous

A 9 kVA, 208 V (L-L), 3-phase Y connected stator, synchronous generator has a stator resistance of 0.1 ohm per phase, and a synchronous resistance of 5.6 ohm per phase. The generator is driven by a diesel engine, and is ...

Assume an image uses a palette of size 8 out of the table

Assume an image uses a palette of size 8 out of the table used by JPEG (GIF uses the same strategy, but the size of the palette is 256), with the combination of the following colors with the indicated level of intensitie ...

1 outline the steps involved in the magnetostatic field

1. Outline the steps involved in the magnetostatic field analysis of a parallel plate structure and the determination of its inductance. 2. Outline the steps involved in the electromagnetostatic field analysis of a paral ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro