TEST YOUR KNOWLEDGE IN DIGITAL ELECTRONICS

Created it, 06/02/22

Last update it, 06/02/22

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Test 1     Test 2     Test 3     Test 4     Test 5     Test 6     Test 7     Test 8     

FOOT-NOTE : You will find several questionnaires which will allow you to test acquired knowledge, answers to these tests you, as for them, being given in the various following pages. With this process, you can thus immediately ensure you of the exactitude of your answers. (Each question is worth 2 points).

We do not address to our fellow-members for these tests, nevertheless, if you wish it to carry out a small revision in the field of DIGITAL electronics, one leaves it to to you to supplement your knowledge.

Test N° 1

1st series of tests

  To give the truth tables of the equations :

1)  X = a . b

2)  S = a + b

3)  L =

4)  M =

5)  S = a . b . c

2nd series of tests

1°) By using the two theorems of MORGAN, to give the equivalents of :

a)     X =                  X =

b)     X =                  X = 

  2°) To draw the electric diagram of the following equations (to deduce simplifications so necessary) :

a)      L = (a + b) . (c + d)

b)      L = . b . c

c)      L = ( . a) + ( . c) + (a . c)

3rd series of tests

1°) By the algebraic method, to simplify the function :

X = a . . + a . b . + a . . c + a . b . c

2°) By the algebraic method and the theorems of MORGAN :

a) To simplify the function below :

b) To interpret the result :

Test N° 2

1°) What differentiates a sequential system from a combinative system ?

2°) can one pass from a level L to a level H in a null time ?

3°) What a secondary variable ?

4°) Knowing that one has two buttons a and b, one imposes the following conditions of exit :

       For a = 0 and b = 0 : S = 1

      One supports on b : S = 0

      One supports on a simultaneously with b : S = 1

      One slackens b by maintaining a : S = 1

To give the primitive matrix of the states.

5°) From the primitive matrix obtained, give the polygon of fusion.

6°) From the polygon of fusion, give the contracted matrix.

7°) From the reduced matrix, give the table of Karnaugh of the exit.

8°) From the table of Karnaugh, give the logigramme system and the simplest equation of the exit.

9°) Supplement the chronogram of the following assembly.

10°) A what serve a bistable rocker ? Which is its principal property ?

11° - a) How one of a rocker R.S. passes to a rocker R.S.C. ?

        b) How does one pass of a rocker R.S.C to a rocker D ?

12°) Supplement the chronogram relating to a rocker D of the latch type

Test N° 3

1°) To supplement the chronogram of the exit Q relating to positive rocker D a “edge triggered”.

2°) Is the following assembly :

To supplement the chronogram of the Q1 exits and S.

Calculate the period T' signal S according to the period T of the signal E. Which is the goal of this assembly ?

3°) Which the role of entries PRESET and CLEAR of a rocker D or JK ?

4°) Is following rocker JK :

To supplement the chronogram of the exits Q and .

Test N° 4

1°) The following assembly is proposed to you. To the point E is applied a level of tension which can last 1 to 2 ms. Which is related to this assembly ? For that, to trace the chronogram relating to the point E, S, A and B.

Take account of the travel time of each door.

2°) From the assembly proposed hereafter, trace the chronogram clarifying the operation of this assembly. Which is related to this assembly ?

It is possible for you to cable this assembly on the digilab. You can connect for example the point A to P0 et S à L0.

3°) From the following assembly, trace the evolution of the exit S according to the entry E.

4°) In the following assembly, calculate using the values of resistances and condensers the frequency of the oscillations to point A then at the point B. to deduce from It the chronograms at points A, B and S.

Test N° 5

1°) To convert the decimal number 17₁₀ into binary.

2°) To convert the decimal number 247₁₀ into binary.

3°) To convert the binary number 10111₂ into decimal.

4°) To convert the decimal number 171₁₀ into hexadecimal

5°) Give the twos complement of the binary number 100111.

6°) Carry out the following binary addition :

7°) Carry out the following binary multiplication :

8°) In these two operations (above), transform the binary numbers of decimal numbers and carry out the operations into decimal to check the results obtained.

  Test N° 6

1°) Give the diagram of a register 3 bits to an entry series and a port serial realized with rockers D synchronous.

2°) Comment can one make so that the information of a register series-series is not lost during the reading ?

3°) Which the four operating modes of a universal register ?

4°) Which characteristic of clock distinguishes the register with shift of the dynamic type of that of static type ?

5°) Give the diagram of a register 4 bits to an entry series and four parallel ports.

Test N° 7

1°) Trace the diagram of the divider by two formed with a rocker D and that of the same divider formed with a rocker JK.

2°) From the diagram of a meter, how can one know if it is synchronous or asynchronous ?

3°) The following meter is a synchronous meter of module 8. There is an error on the diagram, which ?

4°) Which is the module of the following meter :

Plot the diagram of the states of this meter above.

5°) You have a meter of module 16 prépositionnable. How can you transform it to obtain a meter of module 12 passer by state 0 (the entry of presetting is asynchronous

Test N° 8

1°) What a code ?

2°) That it is the utility of a decoder ?

3°) How much figures is it necessary to account for 36₁₀ into binary balanced ?

4°) Which means the expression meter with 12 bits ?

5°) Which means M.S.B. and L.S.B. ?

6°) can one use a decoder only for reading certain values ?

7°) Draw the logical circuit of decoding which makes it possible to extract number 25 of the exits from a binary counter modulates 32 to 5 bits.

8°) Transform into hexadecimal the following binary numbers :

111011 ; 1010001 ; 1100110011001 ; 01110 ; 00011 ; 10000 ; 1

9°) Transform into binary the following hexadecimal numbers :

8 ; 1A ; AB ; B1A ; 32F ; A0 ; 10

10°) Transform into code B.C.D., the decimal numbers following :

4 ; 31 ; 107 ; 1024 ; 43000

11°) What one decade ?

12°) Which the expression “four towards ten” applied to a decoder means ?

13°) What a decoder B.C.D. towards seven segments ?

14°) Comment does one make to restrict the number of wire necessary to order a group of bill-posters ?

15°) Which difference implies a bill-poster with cathode common compared to a bill-poster to common anode with regard to the decoder used ?

16°) Which characteristic introduces a bill-poster L.C.D. ?

17°) Comment is a bill-poster L.C.D. ordered ?

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Daniel