Ask Question, Ask an Expert


Ask Electrical & Electronics Expert

1) A 250 kVA, 6600/400 volts, 3 phase core type transformer has the total loss of 4800 watts on full load. The transformer tank is 1.25 m in height and 1m*0.5m in plan. Develop an appropriate scheme for the cooling tubes if average temperature rise is to be limited to 35º C. The diameter of the tube is 50 mm and is spaced 75 mm from each other. The average height of the tube is 1.05m.

2) Find the estimated diameter and length of stator core, the number of stator slots and the number of stator conductors for a 11 kW, 400 volt, 3 phase, 4 pole, 1425 rpm, delta connected induction motor. Bav= 0.45 Wb/m2 load efficiency=0.8, pf=0.88, L/ τ=1. The stator employs a double layered winding.

3) Evaluate the main dimensions, air gap length, stator slots, stator turns per phase and cross sectional area of the stator and rotor conductors the 3 phase, 15 HP, 400 V, 6 pole, 50 HZ, 975 rpm induction motor. The motor is appropriate for star delta starting. Consider the Bav=0.45 Wb/m2 and ac= 20000 ac/m, L/ τ= 0.85, η=0.9 and pf=0.85.

4) find out the major dimensions of the 12 MVA, 13.8 kV, 50 HZ, 1500 rpm, 3 phase star connected alternator. The following particulars are given: Average gap density= 0.6 Tesla, Ampere conductors per metre = 42000, peripheral speed= 80m/sec.  Also, determine the maximum flux, number of stator slots if one conductor per slot is used, and the number of turns per phase.

5) Find the major dimension of the A 1250 kVA, 3 phase, 6600 Volt salient pole alternator has the following data: Air gap diameter= 1.6 m, length of the core= 0.45 m, number of poles= 20, armature ampere conductors per metre = 28000, ratio of pole arc to pole pitch is 0.68, stator slot pitch= 28 mm, current density in the damper bars= 3 A/mm2.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913284

Have any Question? 

Related Questions in Electrical & Electronics

1 oil is supplied at the center of two long plates the

1. Oil is supplied at the center of two long plates. The volumetric flow rate per unit length is Q and the plates remain a constant distance, b, apart. Determine the vertical force per unit length as a function of the Q, ...

1 the tank is accelerated upward at a uniform rate does the

1. The tank is accelerated upward at a uniform rate. Does the manometer level go up or down? 2. Glass viewing windows are to be installed in an aquarium. Each window is to be 0.6 m in diameter and to be centered 2 m belo ...

1 in an impulse invariance design show that if has is a

1. In an impulse invariance design, show that if Ha(s) is a transfer function of a stable system, the corresponding H[z] is also a transfer function of a stable system. 2. First-order backward differences provide the tra ...

Hugo views donuts and coffee as perfect complements he

Hugo views donuts and coffee as perfect complements: He always eats one donut with a cup of coffee and will not eat a donut without coffee or drink coffee without a donut. Derive and plot Hugo's Engel curve for donuts. H ...

In a kademlia network with m 4 we have five active nodes

In a Kademlia network with m = 4, we have five active nodes: N2, N3, N7, N10, and N12. Find the routing table for each active node (with only one column).

1 in pastry assume the address space is 16 and that b 2

1. In Pastry, assume the address space is 16 and that b = 2. How many digits are in an address space? List some of the identifiers. 2. In a Pastry network with m = 32 and b = 4, what is the size of the routing table and ...

1 why is it that the distances r1 and r2 in the phase

1. Why is it that the distances r 1 and r 2 in the phase factors in equations (8.47a) and (8.47b) cannot be set equal to r, but the same quantities in the amplitude factors can be set equal to r? 2. What is an array fact ...

1 how would you use amperes circuital law in differential

1. How would you use Ampere's circuital law in differential form to find the magnetic field adjacent to the current sheet? 2. If the current density on the infinite plane current sheet of Figure 4.2 were directed in the ...

1 briefly discuss the determination of the fresnel

1. Briefly discuss the determination of the Fresnel reflection and transmission coefficientsv for an obliquely incident wave on a dielectric interface. 2. What is total internal reflection? Discuss the nature of the refl ...

1 explain how a 1 bit 4-to-1 mux can calculate any binary

1. Explain how a 1 bit 4-to-1 MUX can calculate any binary Boolean function. Because the MUX can calculate the result of any Boolean function, we call the MUX a univeral operation. 2. In Logism implement an 8 bit 4-to-1 ...

  • 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

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

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen