Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1)(a) describe with suitable sketches the construction of a DC machine.

(b) Deduce the EMF equation of DC generator.

2) Draw and describe no-load and load characteristics of DC shunt, series and compound generators.

3) Describe the effect of armature reaction in a DC shunt generator. How is its demagnetizing and cross-magnetizing ampere turns find outd?

4) Describe the process of commutation in a DC machine in detail.

5) With the help of a suitable circuit diagram, describe the procedure for paralleling two DC shunt generators and for transferring load from one machine to the other.

6) A 4-pole, 50 kW, 250 V, wave wound shunt generator has 400 armature conductors. Brushes are given a lead of 4 commutator segments. Compute the demagnetization ampere-turns per pole if shunt field resistance is 50 ohm. Also compute extra shunt field turns per pole to neutralize the demagnetization.

7) Describe the various methods used for speed control of D.C. shunt motor.

8) With the help of neat circuit diagram, describe swinburne’s test and deduce the relations for efficiency (both for generator and motor) also prepare down the merits and demerits of this method

9)(a) Describe about circuit model of D.C. machine in detail.

(b) A 440 V D.C shunt motor takes 4A at no load. Its armature and field resistances are 0.4 ohms and 220 ohms respectively. Evalyate the kW output and efficiency when the motor takes 60A on full load.

10)(a) Deduce the expression for torque developed in an armature of a D.C. motor.

11) With the help of neat circuit diagram, describe Hopkinson’s test and deduce the relations for efficiency (both for generator and motor) also prepare down the merits and demerits of this method.

12)a) Describe about different methods of excitation in detail.

(b) Deduce the expression for efficiency of D.C. machines.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M911394

Have any Question? 


Related Questions in Electrical & Electronics

Download the matlab program ofdmallocm which simulates

Download the MATLAB program "ofdm_alloc.m", which simulates power and bit allocation for a 64 channel OFDM system, assuming that all channel symbol streams have equal power allocation P k = E [|s k [m]| 2 ] = 1, and that ...

Figure 319 in the text shows that des creates 16 different

Figure 31.9 in the text shows that DES creates 16 different 48-bit keys, one for each round. Why do we need 16 different keys? Why can't we use the same key in each round?

Term project - the step response of rlc circuitsthe team

Term Project - The Step Response of RLC Circuits The team project pertains to Chapter 9 in the text book. You should submit a single report and Multisim/ LTSpice file. The report should be submitted as a Word document an ...

1 does sip need to use the service of rtp explain2 we

1. Does SIP need to use the service of RTP? Explain. 2. We mentioned that SIP is an application-layer program used to provide a signaling mechanism between the caller and the callee. Which party in this communication is ...

1 complete the missing steps in the evaluation of the

1. Complete the missing steps in the evaluation of the integral in equation (9.39a). 2. Find the time-average power required to be radiated by a half-wave dipole in order to produce an electric field intensity of peak am ...

Consider a plane-strain square element with unit depth as

Consider a plane-strain square element with unit depth as shown in the figure. Use the St. Venant-Kirchhoff isotropic material model with two Lame's constants λ and μ. A uniformly distributed force T x  (force per area) ...

1 a 15 v aa battery that costs 1 is rated at 18 ah what is

1. A 1.5 V AA battery that costs $1 is rated at 1.8 Ah. What is its cost per kWh? 2. Suppose a 12-V battery bank rated at 200 Ah under standard conditions needs to deliver 600 Wh over a 12-h period each day. If they oper ...

A rectangular plastic specimen of size 100 x 100 x 10

A rectangular plastic specimen of size 100 X 100 X 10 mm 3  is placed in a rectangular metal cavity. The dimensions of the cavity are 101 X 101 X 9 mm 3 . The plastic is compressed by a rigid punch until it is completely ...

1 draw the symbols for the nand nor xor and xnor gates what

1. Draw the symbols for the NAND, NOR, XOR, and XNOR gates. What is the difference between the Buffer, AND, OR, XOR and the NOT, NAND, NOR, and XNOR gates? 2. Modify the circuit from question 2 to use a second AND gate o ...

Suppose that a discrete-time system is specified by the

Suppose that a discrete-time system is specified by the transfer function Compute and plot a. The step response of the system b. The impulse response of the system c. The response of the system to the input signal

  • 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