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Neha Agarwal
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Quote Neha Agarwal Replybullet Topic: Digital Electronics sample qns.
    Posted: 09Jan2007 at 6:45pm


Que. 1 an R-S latch is a
A
combinatorial ckt
B
synchronous sequential ckt
C
1-bit memory arrangement
D
one clock delay element

Que. 2 Ques 25. in an 8085 microprocessor system the RST instruction will cause 
an interrupt
A
only if an interrupt service routine is not being executed
B
only if a bit in the intreeupt mask is made 0
C
only if interrupts have been enabled by an EI INSTRUCTION
D
NONE OF THE ABOVE

Que. 3 the minimum number of two input NAND gate required to iomplement the boolean 
function    _ Z=ABC,ASSUME that A,Band C are available is
A
2
B
3
C
5
D
6

Que. 4 The threshold level for logic 1 in the TTL family is
A
only voltage above 2.5V
B
any voltage between 0.8V and 5.0V
C
any voltage below 5.0V
D
any voltage below V(cc) but above 2.8V

Que. 5 the binary fraction 0.0111 in decimal form is equal to
A
0.4375
B
0.6225
C
0.8325
D
0.1105

Que. 6 in order to add 1111+1101, we required
A
one FA,one HA
B
three FA
C
three FA,one HA
D
none of these

Que. 7 A system has a word length of 4-bits.If in this system -ve numbers are 
represented by their Two's compliment,then the range of numbers that can 
be represented by the word length is
A
-8 to +8
B
-7 to +7
C
-16 to +16
D
none of these

Que. 8 The decimal value 0.25
A
is equivalent to binary value 0.1
B
is equivalent to the binary value 0.01
C
is equivalent to the binary value 0.00111
D
cannot be represented precisely in binary

Que. 9 How many boolean functions of 3 variables are there?
A
16
B
64
C
256
D
512

Que. 10 The number of 1s in the binary representation of      (3*4096+15*256+5*16+3) 
are
A

8
B
9
C
10
D
12



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