Que. 1 The number of bits needed to encode all letters (26),10 symbols and all
numbers (10) is
A 5
B 7
C 6
D 8
Que. 2 The use of a cache in a computer system increases the
A available memory space for the program
B available memory space for data
C avrage speed of memory acces
D addressing range of CPU
Que. 3 A microprocessor has 24 address lines and 32 data lines if it uses 10-bits
of op-code the size of its memory buffer register is
A 22 bits
B 24 bits
C 32 bits
D 14 bits
Que. 4 Schottky damping is resosted to in TTL gates
A to reduce propogation delay
B to increases the noise margin
C to increase the packing margin
D to increase fan-out
Que. 5 A pulse train can be delayed by a finite number periods using of clock
A a serial-in-serial out shift resistor
B a serial -in parallel out shift resistor
C a parallel -in series out shift resistor
D a serial -in parallel shift resistor
Que. 6 The switching speed of ECL is very high,because
A the transistors are switched between cutoff and saturation regions
B the transistors are switched between active and saturation regions
C the transistors are switched between active and cutoff regions
D the transistors may be operated in three regions
Que. 7 The number of comparators in a parallel conversion type 8-bit A to D converter
is
A 8
B 16
C 255
D 256
Que. 8 A dynamic RAM cell which holds 5v has to be refreshed every 20m secs,
so that the stored voltage does not fall by more than 0.5v. if the cell
has a constant discharge current of 0.1pA the storage capacitance of the
cell is
A 4*10^-6F
B 4*10^-9 F
C 4*10^-12F
D 4*10^-15F
Que. 9 The minimized from of the logical expression (ABC+ABD+ABC+ABC)
A AC+BC+AB
_ _ _
B AC+BC+AB
_ _ _
C AC+BC+AB
_ _ _
D AC+BC+AB
Que. 10 For a binary half-subtractor having two inputs A and B the correct set
of logical expression for the output D(=A minus) and X(=barrow) are
A D=AB+AB, X=AB
_ _ _ _
B D=AB+AB+AB, X=AB
_ _ _
C D=AB+AB, X=AB
__ _
D D=AB+AB, X=AB
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