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Himachal Pradesh University (HPU) 2010 B.C.A Computer Application - Question Paper

Tuesday, 22 January 2013 02:40Web


[Total No. of Questions - 9] [Total No. of Printed Pages: 3] (2101)


B.C.A. I Year Examination Digital Electronics Paper - BCA-103 (New Syllabus)

Timo : 3 Hours    Max. Marks :(Regular):80

(ICDEOL): 100

The candidates shell limit their answers precisely within the answer-book (40 pages) issued to them and no supplementary/continuation sheet will be issued.

Note : Attempt five questions in all selecting one question each from first four units. Question no.IX is compulsory.

Unit -1

I. a) Discuss the concept of energy bands in solids.


b) What is a pn junction diode? How dq, they work in forward and reverse bias? Explain with the help of suitable diagrams    8(10)

9332/2000    (P.T.O.I


(2)    9332 OR

II. a) Differentiate between    the saturated and

non-saturated logic.    4(5)

b)    Discuss important characteristics of CMOS digital logic family.    8(10)

c)    What are integrated circuits?    4(5)

Unit - II

IILVvrite the Boolean expression and truth tables as well as draw the diagrams for the following logic gates:

a)    OR    b) AND

c) NOR    d) NAND 4x4=16(4x5=20)


IV.    a) Write down 8 basic Boolean laws.    8(10)

b)    What is De-Morgan's theorem? Discuss its duality.



V.    a) Draw the circuit diagram of a half adder and explain

its working with the help of suitable diagrams.


b) Draw the circuit diagram of a full adder and discuss its working.    8(10)

(3)    9332


VI.    a) What are flip-flops? Explain the working of RSFF

and write down its truth table    8(10)

b) What is a master-slave FF? Discuss its working with the help of a suitable diagram.    8(10)


VII.    Discuss the working of a R-2R ladder D/A converter 3. , 16<20>


VIII.    Explain how can dual slope integrator method be used for A/D conversion?    16(20)


IX.    a)    What is a semiconductor?

b)    What is a diode?

c)    What is a NOR gate?

d)    What is a truth table?

e)    What are combinational circuits?

f)    What are sequential circuits?

g)    What is a multiplexer?

h)    What is a decoder?    8x2=16(0x2.5=20)

+ + + *

(a) The Total Sales Book page, Rs. 12,136 was carried forward as Rs. 12,100.

(b) An item in the sales return book of Rs. 408 relating to Z was posted to his account as Rs. 588.

(c)    A chcquc of Rs. 1,000 entered as cash sales on 31st Dec. was not posted to Sabs Account.

(d)    Depreciation of Plant at 10% on Rs. 15,440 has been credited to plant account, there being no corresponding debit.

(e)    An item of Rs. 19 appearing in the debit discount column of the Cash-Book representing discount allowed to B had been posted to the debit of C.

% Pass journal entries to rectify the errors and give the Suspense Account. *


3. Distinguish between Trading and Profit and Loss Account. Give a specimen of trading and profit and loss account with imaginary figures.

*4. X. Ltd. issued for public subscription 20,000 equity shares of Rs. 10 each at a premium of Rs. 2 per share payable as under:

Rs. 2 per share on application; Rs. 5 per share (Including Premium) on allotment; Rs. 2 per share on first call; Rs. 3* per share on final call.

9213/2,50<y777/498    2

Application for 30,000 shares were received. Allotment was made pro-rata to the applicants for 24,000 shares, the remaining applications being rejected. Money overpaid on application was utilised towards sum due on allotment. Shri Y to whom 800 shares were allotted failed to pay the allotment money, fust and scconds calls money and Shri Z to whom 1,000 shares were allotted failed to pay the last two calls.

These shares were subsequently forfeited after the second call was made. All these forfeited shares were reissued to Shri W as fully paid-up at Rs. 8 per share.

Give the necessary journal entries to record the above transactions.


5. From the following data, you arc required to calculate :

(a)    P/V ratio.

(b)    Break Even Sales.

(c)    Sales required to cam a profit of Rs. 4,50,000 Fixed Expenses    = Rs. 90,000 Variable Cost per unit:

Direct Material = Rs. 5 Direct Labour    = Rs. 2

Direct Overheads = 100% of Direct Labour .Selling price per unit = Rs. 12



9213/2,500/777/498    3    [P.T.O.

Total No. of Questions - 9) (2041)

f    9202

Tola! Pages : 3

B.C.A. 1st Year Examination

DIGITAL ELECTRONICS Paper : BCA-103 (New Syllabus)

[Regular : 80 Time : Three Hours]    | Max. Marks :J

[ICDEOL : 100


The candidates shall limit their answers precisely within the answer-book (40 pages) issued to them and no supplementary/ continuation sheet will be issued.

Note : Attempt five questions in all, selecting one question each from four units. Question No. 9 is compulsory.


1.    Draw the circuit of ECL gate and explain its operation.    16(20)

2.    (a) What arc Intrinsic and Extrinsic semiconductor ?

Explain conductivity in intrinsic semiconductor.


(h) Discuss the working of n-p-n u-ansistor.    4(15)

9202/3,500/777/487    [P.T.O.



3.    Explain the laws related to Boolean Algebra.

4.    (a) Explain ihc following :

, (i) Sum of product (SOP).

(ii) Min term.



io(i2) ;

(b) Find the De-morgans equipment of



5.-    Design a full subtracter using 3x8 decodcr and OR gate.    16(20)

6.    What is Shift register ? What arc its types ? List application of shift register.    16(20)


7.    Discuss the various types of A/D converters and also discuss the advantages and disadvantages of each.    16(20)

8. Discuss the performance criteria of a D/A converter. Mow these help in selecting a D/A converter ?    16(20)

UN1T-V (Compulsory Question)

(a.) A-f A.B+A.B = A + B.

(b)    Comparison of Analog Versus Digital.

(c)    Combinaiional versusSequential.

(d)    Advantages of CMOS over Bipolar tech.

4x4 (4x5)

9202/3.500/777/467    3


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