3rd Matlab MCQ

For each question, click on the correct solution(s). One or more propositions can be correct.

mandatory answer

Question 1

Enter your name :

Question 2

What action do the "cleaning" of a signal (i.e. removing parasitic effects like combination with other carriers or removing most of the noise) ?

The integration of the signal

The subtraction of signals

The filtering of the signal

The sampling the signal

Question 3

a=1:2:99
what does the following do ?
a(length(a)/2-3 : length(a)/2 + 3 )

returns an error

returns the array [48 49 50 51 52 53]

returns the array [47 48 49 50 51 52 53]

returns the array [1 2 3 4 5 6]

returns the array [1 2 3 4 5 6 7]

returns the array [45 47 49 51 53 55]

returns the array [43 45 47 49 51 53 55]

Question 6

Which statement(s) is/are correct to open a file and READ data ?

fid=fopen('file.txt', 'r'); data=fscanf(fid, '%f');

fid=fopen('file.txt', 'r'); data=fgetl(fid);

fid=fopen('file.txt', 'w'); data=fscanf(fid, '%f');

fid=fopen('file.txt', 'w'); data=fgetl(fid);

Question 7

Thanks to the AppDesigner editor, you can:

create a window and add controls to it, such as buttons, ploting areas, labels, comboboxes, ...

do call back function to call asynchronously (=whenever you want) some matlab code

do toasts and coffee

create user-friendly interfaces for windows environment

Question 8

If you want to access data (variables and/or controls) across different callback functions you can:

do it without specifying anything (since all variables are accessible everywhere in the code)

use the keyword "global" to access user-defined variables (if those are defined as "global" in every function they are used)

use the keyword "global" to directly access controls (such as button, ...)

use the object "appdata" which is always defined for a callback function (so, not everywhere, only in callback functions)

Question 10

When specifying format to fprintf function, %c stands for:

sequence of characters

floating point numbers

integers only

Question 11

When specifying format to fprintf function, %f stands for:

sequence of characters

floating point numbers

integers only

Question 12

What does the following statements exactly do :
fid=fopen('tempfile2.txt', 'w');
fprintf(fid, '%7.3f', 1.123456789);
fclose(fid);

nothing / an error

create a text file and write “1.1234567” into it

create a text file and write “1.123456” into it

create a text file and write “1.123” into it

create a text file and write “1.123e0” into it

create a file and write the floating point number 1.123456789 in binary format into it

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3rd Matlab MCQ

Enter your name :

What action do the "cleaning" of a signal (i.e. removing parasitic effects like combination with other carriers or removing most of the noise) ?

a=1:2:99
what does the following do ?
a(length(a)/2-3 : length(a)/2 + 3 )

Which function(s) can READ from a file ?

Which function(s) can WRITE binary or text to a file ?

Which statement(s) is/are correct to open a file and READ data ?

Thanks to the AppDesigner editor, you can:

If you want to access data (variables and/or controls) across different callback functions you can:

How to transpose 'A' (simple transposition, NOT conjugate transposition) ?

When specifying format to fprintf function, %c stands for:

When specifying format to fprintf function, %f stands for:

What does the following statements exactly do :
fid=fopen('tempfile2.txt', 'w');
fprintf(fid, '%7.3f', 1.123456789);
fclose(fid);

3rd Matlab MCQ

Enter your name :

What action do the "cleaning" of a signal (i.e. removing parasitic effects like combination with other carriers or removing most of the noise) ?

a=1:2:99what does the following do ?a(length(a)/2-3 : length(a)/2 + 3 )

Which function(s) can READ from a file ?

Which function(s) can WRITE binary or text to a file ?

Which statement(s) is/are correct to open a file and READ data ?

Thanks to the AppDesigner editor, you can:

If you want to access data (variables and/or controls) across different callback functions you can:

How to transpose 'A' (simple transposition, NOT conjugate transposition) ?

When specifying format to fprintf function, %c stands for:

When specifying format to fprintf function, %f stands for:

What does the following statements exactly do :fid=fopen('tempfile2.txt', 'w');fprintf(fid, '%7.3f', 1.123456789);fclose(fid);

a=1:2:99
what does the following do ?
a(length(a)/2-3 : length(a)/2 + 3 )

What does the following statements exactly do :
fid=fopen('tempfile2.txt', 'w');
fprintf(fid, '%7.3f', 1.123456789);
fclose(fid);