Power Electronics Multiple Choice Questions

Electronics and Communication Multiple Choice Questions

1. A step up chopper is required to deliver a load voltage of 660V from a DC source of 220V. Let the non-conduction time of thyristor be 100 micros required the requited pulse width, ton:

a. 150 micro sec

b. 200 micro sec

c. 330 micro sec

d. 240 micro sec

2. The thyristor can be turned on by applying?

a. a positive signal to gate

b. a negative signal to gate

c. holding current to the gate

d. none of the above

3. When two SCRs are connected in parallel configuration?

a. the SCR with lower dynamic resistance will carry lesser value of current

b. the SCR with lower dynamic resistance will carry higher value of current

c. both the SCR with carry equal values of current even if their dynamic resistance are different

d. none of the above

4. A class-C chopper (DC to DC converter) is also known as?

a. one-quadrant regulator

b. two-quadrant chopper

c. steady state chopper

d. all of the above

5. The flyback converter topology in a DC to DC switched mode power supply?

a. should be restricted to low power application

b. can be used for high power application

c. would be selected depending upon the DC load of the equipment in question

d. can be selected without considerations of power requirement of the equipment in questions.

6. A UPS is an example of?

a. a DC SMPS

b. an AC SMPS

c. a DC to DC converter

d. a voltage regulation device

7. An n-channel enhancement MOSFET?

a. has a physical channel

b. has no physical channel

c. is similar in construction to a p channel depletion MOSFET

d. none of these

8. The enhancement MOSFETs responds to?

a. positive and negative gate voltages

b. positive gate voltage only

c. negative voltage only

d. none of above is true

9. A DC chopper (DC to DC converter) is turned on for 30 micro sec and turned off for 10 micro sec. What is its duty cycle?

a. 0.62

b. 0.92

c. 0.75

d. 0.85

10. In a three-phase bridge inverter?

a. firing of SCRs can be done for a period of 120 degree only

b. firing of SCRs can be done for a period of 180 degree only

c. firing of SCRs can be done for a period of 120 degree and 180 degree periods

d.  none of the above

Answers:

1.  b

2. a

3. b

4. b

5. a

6. b

7. b

8. b

9. c

10. c

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How to Become a Successful HR Manager

It's a role in the organization formed to maximize workforce performance in service of organizational strategic goals. 

As an HR professional, multitasking is a crucial skill dealing with employees personal issues administrating benefit packages and also developing new recruiting strategies can consume your day priorities. HR professional always does the delicate balancing activities in a workplace.

The main responsibility of the HRM department include:

Hiring

Evaluating

Training

Compensation of Employees

The main objectives of HRM fall into four categories:

Social 

Organizational

Functional

Personal

Criteria used in Human Resource Management:

Value Building

Rarity and Incomparability

Organised workforce

HRM covers essential areas that are:

Job analysis and Designing

Planning the workforce

Legal issues

Traning, development, and performance

Follow these things and you should become more effective HR Manager.

About the Author

Sakshi Batra, having more than 2-year experience in HR operations- Training & Development at Bajaj Capital Ltd.

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How to concatenate text with binding value in label control in Xamarin Forms - Solved

This blog is all about – to concatenate text with binding value in label control in Xamarin Forms.

Actually, you can bind value in two ways: -

I. Binding concatenated text and value in XAML or View.

In this case, if you want to directly bind your concatenate value with text in XAML page itself. This is the easiest way to do so because Label in Xamarin forms supports StringFormat property. The only thing is to create a property and bind it to the View.

For Example:

In Code behind (XAML.CS):

public string Name { get; }

public BindingConcatTextValue()

{

    InitializeComponent();

    Name = "Imagination Hunt";

    BindingContext = this;

}

Then in XAML or View:

<Label Text="{Binding Name, StringFormat='Customer Name : {0}'}" />

Here, StringFormat does the task to add Text+Value in View and BindingContext bind the value from CodeBehind to View.

Output: Customer Name : Imagination Hunt

II. Binding concatenated text and value in XAML.CS ÓR .CS page

In this case, you should create a new property which does the format you want and binds it to the View. And make sure the property is public.

For Example:

In View Model (.CS):

public class BindingConcatTextValueViewModel

{

    private string _name;

    public string Name

    {

        get { return _name; }

        set { _name = value; }

    }

    public string CustName { get; set; }

    public BindingConcatTextValueViewModel()

    {

        CustName = "Imagination Hunt";

        Name = string.Format("Customer Name: {0}", CustName);

    }

}

Then in Code-Behind (XAML.CS)

public string Name { get; }

public string CustName { get; set; }

public BindingConcatTextValue2()

{

     InitializeComponent();

     //When you want your label value bind from CodeBehind

     CustName = "Imagination Hunt";

     Name = string.Format("Customer Name: {0}", CustName);

     BindingContext = this;

     //Or when you want your label value bind from ViewModel

     BindingContext = new BindingConcatTextValueViewModel();

}

Then in XAML:

<Label Text="{Binding Name}" />

Output: Customer Name: Imagination Hunt

Hope you find the article helpful and interesting. For any query, comment us below.

Previous - What is Xamarin?

 

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Related Questions: -

#newtoprgm try the first program

Ques - How you connect these “Name” property to your View or XAML page?

Ans. – BindingContext.

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Posted By - +Manish Kumar Gautam +LIVE VIAR +ASP.NET SOLUTIONS

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Electronic Measurement and Instrumentation Multiple Choice Questions

Electronic and Communication Multiple Choice Questions

1. The accuracy of the digital voltmeter is specified as:

a. percentage of the actual reading

b. percentage of the full-scale reading

c. number of least significant digits

d. all of the above

2. An FET VM employs FETs in?

a. cascade mode

b. cascode mode

c. differential mode

d. common mode

3. A DVM measure?

a. peak value

b. rms value

c. peak to peak value

d. average value

4. Resolution of DVM with 4 digit display is?

a. 1/4

b. 1/1000

c. 1/1000

d. 1%

5. The best method of measuring capacitance is the?

a. CRO method

b. transistor-Voltmeter method

c. voltmeter-ammeter method

d. a.c bridge method

6. Transistor voltmeter is a?

a. dynamometer type instrument

b. moving iron instrument

c. moving coil instrument

d. none of these

7. Parallel connection Q meter is used for measuring?

a. Low impedance component

b. High impedance component

c. a and b both

d. none of these

8. Transistor voltmeter is a highly sensitive instrument and can be used for measurement of?

a. energy

b. power

c. voltage and current

d. d.c. voltage only

9. Transistor voltmeter?

a. cannot measure a.c. voltage

b. cannot be designed to measure resistance as well as voltage

c. cannot measure high-frequency voltage

d. can measure a.c. voltage

10. The maximum input signal frequency that can be used with a CRO is limited by?

a. input probe capacitance

b. the vertical amplifier

c. the frequency of the sync signal

d.  the horizontal amplifier

Answers:

1.  d

2. c

3. d

4. c

5. d

6. c

7. b

8. c

9. d

10. b

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Profit and Loss Tricks for bank PO and SSC CGL

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Electromagnetic Theory Multiple Choice Questions

Electronics and communication Multiple Choice Questions

1. The electric field intensity magnitude at a point (1,2,3) m, in Cartesian coordinates due to a charge(1/9) nC located at the origin is equal

a. 3.3 V/m

b. 0.33 V/m

c. 0.033 V/m

d. zero

2. The divergence theorem applies to?

a. static fields only

b. time-varying fields only

c. both static as well as time-varying fields

d. magnetic fields only

3. For a plane electromagnetic wave traveling in a linear, isotropic, homogeneous stationary medium?

a. E and H lie in the same plane

b. E * H = 0

c. E and H are mutually perpendicular

d. None of these

4. An electromagnetic wave propagates from a dielectric medium to the interface with free space. If the angle incidence is the critical angle of 30 degrees, the relative permittivity of the dielectric medium is?

a. 8

b. 4.5

c. 6.8

d. 4

5. When an electromagnetic wave traveling in one medium strike upon a second medium having a different conductivity the wave will be?

a. neither transmitted and partially reflected

b. totally reflected

c. partially transmitted and partially reflected

d. totally transmitted

6. In the perfect conductor, the incident and the reflected waves combine to produce?

a. linearly polarized

b. circularly polarized

c. elliptically polarized

d. horizontal polarized

7. The polarization of dielectric materials results in?

a. absorption of electrons

b. the release of high-velocity protons

c. creation of electric dipoles

d. production of eddy currents

8. The absorption of radio waves by the atmosphere depends on?

a. the polarization of atmosphere

b. the polarization of the waves

c. their frequency

d. their distance from the emitter

9. As an electromagnetic wave travels in free space the only one of the following can happen to them?

a. reflection

b. absorption

c. attenuation

d. refraction

10. When a current carrying conductor is brought into the magnetic field the force that moves the conductor depends upon which of the following?

a. The value of current

b. The weight of conductor

c. The direction of the conductor

d.  None of these

Answers:

1.  b

2. c

3. c

4. d

5. c

6. c

7. c

8. c

9. c

10. a

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Network Theory Multiple Choice Questions

Electronics and Communication Multiple Choice Questions

1. Zero of a network is the critical frequency at which network function becomes___

a. zero

b. unity

c. infinite

d. sinusoidal

2. Poles of E z(s) are:

a. always simple

b. always in multiple form

c. always imaginary

d. either simple or of higher multiplicity

3. An impedance function whose real part vanishes at some real frequency is called?

a. minimum impedance function

b. minimum reactance function

c. minimum susceptance function

d. minimum resistance function

4. A minimum reactance function is one which has?

a. no zero at origin

b. no poles at origin

c. no zero on imaginary axis

d. no poles on the imaginary axis

5. In an impedance function, a pole at infinity is realized by using?

a. a capacitance In series

b. an inductance in series

c. an inductance in parallel with the driving point terminal

d. none of these

6. The response of a network is decided by the location of?

a. it's zero

b. it's poles

c. both zero and poles

d. neither zeros nor poles

7. As the poles of network shift away from the axis, the response?

a. remains constant

b. becomes less oscillating

c. becomes more oscillating

d. none of these

8. Pole of a network is a critical frequency at which network function?

a. becomes zero

b. becomes unity

c. becomes infinite

d. becomes very large

9. An inductor has self-resistance of 5 ohm and inductive reactance of 250 ohms at the operating frequency. The quality factor of the inductor is?

a. 1250

b. 50

c. 250

d. 5

10. The Q factor of a series LCR circuit increases if?

a. R increases

b. R decreases

c. applied voltage increases

d.  current decreases

Answers:

1. a

2. d

3. d

4. d

5. b

6. c

7. b

8. c

9. b

10. b

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Initializecomponent doesnot exist in xamarin forms visual studio 2017

Hi Developers, there is various solution whatever suits you try down from the list: -

Solution 1: R.Click the Solution file and select Clean Code. Once solution cleaned succeeded. R.Click the solution and select Build Solution.

Solution 2: Close the project and Re-open the same project using File -> Open project -> Select Solution file (.sln). Clean and Build Solution.

Solution 3: Re-build solution will sometime remove the error.

Solution 4: Update Xamarin.Forms package from NuGet package manager. To do so Goto the Menu bar, select Tools TAB -> Select NuGet Package Manager -> Select Manage NuGet Packages for Solutions -> Under Updates TAB select Xamarin.Forms -> Check All Mobile O.S. and click on Install button.

Solution 5: MyProject.projitems: Open project in File Explorer there you will find a file whose extension is .projitems. Open the file in notepad.

Now, change the code layout as below:

For Example:

<?xml version="1.0" encoding="utf-8"?>

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <PropertyGroup>

    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>

    <HasSharedItems>true</HasSharedItems>

    <SharedGUID>00000-00000-00000-00000-00000</SharedGUID>

  </PropertyGroup>

  <PropertyGroup Label="Configuration">

    <Import_RootNamespace>DemoXamarin</Import_RootNamespace>

  </PropertyGroup>

  <ItemGroup>

    <EmbeddedResource Include="$(MSBuildThisFileDirectory)App.xaml" />

  </ItemGroup>

  <ItemGroup>

    <Compile Include="$(MSBuildThisFileDirectory)App.xaml.cs">

      <DependentUpon>App.xaml</DependentUpon>

    </Compile>

    <Compile Include="$(MSBuildThisFileDirectory)Model\Employee.cs" />      

    <Compile Include="$(MSBuildThisFileDirectory)MainPage.xaml.cs">

      <DependentUpon>MainPage.xaml</DependentUpon>

      <SubType>Code</SubType>

    </Compile>

  </ItemGroup>

  <ItemGroup>

    <EmbeddedResource Include="$(MSBuildThisFileDirectory)MainPage.xaml">

      <SubType>Designer</SubType>

      <Generator>MSBuild:Compile</Generator>

    </EmbeddedResource>

  </ItemGroup>

</Project>

Hope you find the article helpful & interesting.

For any query, comment us below.

Previous – What is Xamarin?

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Posted By - +Manish Kumar Gautam +LIVE VIAR +ASP.NET SOLUTIONS 

Keep learning and sharing...

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