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Some Problems on Three phase Circuits

1. A balanced star connected load of (8+j6) ohm per phase is connected to a balanced 3-phase, 400V, 50Hz supply. Find the line current, power factor, power and total volt-amperes. 2. A balanced star connected load is supplied from a symmetrical 3-phase 440V system .The current in each phase is 30A and lags 30 degree behind the phase voltage. Find phase voltage total power and reactive power. 3. Three identical coils connected in delta across 400V,50HZ 3-phase ac supply, take a line current of 17.32 A at power factor of 0.7 lagging Calculate phase current , the resistance and inductance of each coil, power drawn by each coil. 4. 3-coils are connected in star to a balanced 3-phase 440V 50 HZ supply and takes a line current of 10A AT 0.9 pf lagging. Calculate the resistance and reactance of the coil. If the coils are delta connected to the same supply calculate the line current and real power. 5. The 3-phase voltage and current of a star connected load is 100V and 10 A . The p...
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Some Exercises for Students Learning C/C++ in First Year Engineering

1.      Program to Print the Message “Hello” on the Screen. 2.     Program to display a Triangle of    * on the screen. 3.     Program to calculate area of a triangle 4.     Program to evaluate the area of the circle Area = Pi * R 2 5.      Convert the time in seconds to hours, minutes and seconds. (1 hr=3600 sec). 6.      Find the sum of the digits of a four-digit number (ex 1234    sum=10). 7.      Convert temperature given in Fahrenheit to Centigrade and Centigrade to Fahrenheit. (C=5/9(F-32)). 8.      Converting distance in mm to cm, inch, feet (1 cm =10mm, 1inch=2.5cm, 1 feet =12   inches). 9.      Check whether the given number is odd or even. 10.    Find the roots of a quadratic equation (use of Switch and Break).  Hint: root = -b +/- sqrt (b2-4ac)/2a ...
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Conceptual Questions on Interference of Waves

1. To demonstrate the interference of waves, Thomas Young allowed light from a single illuminated slit to fall on a pair of narrowly spaced slits. Explain a. Why light from two separate lamp bulbs can never produce an interference pattern b. Why double slits used as above give an interference pattern How would the interference pattern differ if c. The double slits had been closer together 2. Why must two loudspeakers be producing sounds of exactly the same frequency in order for us to hear the effects of interference? 3. Two loudspeakers are placed 4 m apart for an open-air concert. They are playing back a flute sounding a note of 680 Hz. Members of the audience sit in a row, 20 m from the loudspeakers, parallel to the line between the loudspeakers. Take the speed of sound as 340 m s–1. Describe, as precisely as possible, what different people in the row will hear. 4. When a spherical surface is put in contact with an optically flat plate, circular interference patterns,...
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Diffraction Grating Experiment

  Aim: To determine the wavelength of prominent spectral lines of mercury by plane diffraction grating in first and second order spectrum. APPARATUS: Spectrometer, mercury lamp, plane diffraction grating, readings lens, sprit level et. THEORY AND FORMULA: The grating spectrum formed in the direction 𝜃 is given by  (e + b) sin 𝜃 =  ( )sin e b n      where (e + b) = grating element (cm)  = angle of diffraction n = order of the spectrum PROCEDURE: Before performing the experiment, the following adjustments are made. 1. Setting the Grating for Normal Incidence (a) The spectrometer is well adjusted for parallel beam using the usual procedure of seeing a far object. (b) The position of the telescope is adjusted in such a way that the image of the slit is focussed on the vertical crosswire of the telescope. In this position, the collimator and the telescope are in the same line. The reading is noted on the circular scale. (c) The telescope is now turned th...
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Making A Sample App using Android Studio

package xyz.himeshjain.thequotes ; import android.content.Intent ; import android.media.MediaPlayer ; import android.support.v7.app.AppCompatActivity ; import android.os.Bundle ; import android.view.View ; import android.widget.CompoundButton ; import android.widget.RelativeLayout ; import android.widget.Switch ; import android.widget.TextView ; import java.util.ArrayList ; public class Quotes extends AppCompatActivity { MediaPlayer namokar1 ; Switch namo ; int count= 0 ; @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState) ; setContentView(R.layout.activity_quotes) ; namokar1 = MediaPlayer.create( this, R.raw.namokar) ; namo = (Switch) findViewById(R.id.switch1) ; namo.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() { public void onCheckedChanged(CompoundButton buttonView , boolean isChecked) { if (isChecked){ na...
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She Couldn't

The tea nearly spilled out of the ivory cup. Her face appeared relieved after the primary sip – however her arms trembled. She geared toward the saucer and slammed the cup at the internal circle of the saucer, wearing a boastful 1/2-smile to have a good time but some other `fulfillment’. As I cringed at the clink, she ordered, “finish your milk before it turns bad.” I nodded and dragged the glass of milk nearer, deciding on not to give an explanation for that I had asked the cook for a chilly coffee just a couple of minutes ago. glaringly, she hadn’t heard that. because she couldn’t.
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My Review Of Moto X Play After Using It For 6 Months

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I am a proud owner of Moto X Play for the last 6 months. I must say I come out Very Impressed and worried about the lack of its popularity.. So I have written a review of Sorts below.. The Positives: The Motorola Add Ons : Motorola Take a Bow From Me, They know how to do Software.. I was initially keeping this further down in The review as Many in this subreddit know about them and can explain their strengths better than me... But after using the device longer I realised they just make such a big part of my experience that they had to be at the top.. Moto Display : It is one of the best thing about this phone (even Surpassing the great Battery Life) pick it up from the table or from your pocket, screen turns on and helps you quickly access your missed notifications. What others don't mention is that It also prevents wear of Power Button. (I heard Phones even bricking due to weared out/faulty Power button) Moto Voice : I can wake up my phone even while screen i...
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