- Which of these sets of logic gates are designated as universal gates?
Using any one of these 2 gates - NAND, NOR we can design all logic gates.
- Which one of the following is not a vectored interrupt?
Here TRAP, INTR, RST 7.5 are vectored interrupt. But RST 3 is not a non vectored interrupt.
- The 2’s complement of the number of 1010101
The binary number is 1010101. We know that 2’s complement = 1’s complement + 1. So 1’s complement of 1010101 is 0101011. Then add with 1 , we get 2’s complement 101011 + 1 = 0101011.
- In the toggle mode a JK flip-flop has
J = 0, K = 0 - no change condition between pre-state and next state, J = 0, K = 1 - it is always reset condition means next state is always 0, J = 1, K = 0 - it is always set condition means next state is always 1, J = 1, K = 1 - it is toggle condition means when pre-state is 1 then next state is 0 or when pre-state is 0 then next state is 1.
- The resolution of a 12 bit analog to digital converter in percent in
Under construction.
- What will be Excess - 3 code for decimal ( 584 )?
5 8 4 + 3 3 3 = 8 11 7. Then 8 is a decimal no. So it is converted to binary when result is 1000, 11 convert to binary 1011, 7 convert to binary-0111. So result is (1000 1011 0111).
- The number of comparators in a parallel conversion type 8-bit analog to digital converter is
Number of comparators = ( 2
^{N}- 1 ) = ( 2^{12}- 1 ) = 255 ( N = no. of bits ). - Excess 3 code is known as
Complement of Excess 3 code is 9's complement of that digit in excess 3. So excess 3 code is also called self complementing code.
- 8085 microprocessor has how many pins
Intel 8085 NMOS microprocessor is a 8 bit, 40 pins IC. It is a 40 pin I.C. package fabricated on a single LSI chip. The Intel 8085 uses a single + 5 V DC supply for its operation.Its clock speed is about 3 MHz.The clock cycle is 320 ns. It has 80 basic instructions and 246 opcodes.
- How many flip flops are required to build a binary counter circuit to count from 0 to 1023?
Total count = 1024, 2
^{N}= 1024 or, 2^{N}= 2^{10}or, N = 10 (no. of flip flops). - In 8085 microprocessor, the RST6 instruction transfer programme execution to following location
6 × 8 = ( 48 )10 = 0030H.
- HLT opcode means
HLT opcode in 8085 microprocessor means end of program.
- In flip flop clock is present but in latch clock is
Synchronous circuits change their states only when clock pulses are present.The latch with additional control input ( clock, enable input) is called flip flop.
- Counter is a
A counter is a sequential circuit that keeps a record of the clock pulses sent through it. Like a register, a counter also consists of a group of flip-flops. However, a counter has a characteristics internal sequence of states through which it passes when a series of clock pulses are fed to it. Counters are divided into categories : ripple ( or asynchronous ) counters and synchronous counters.
- The 2's complement of 17 is
17 = 010001, 1's complement = 101110, 2's complement = 101111.
- 1’s complement of 17 is
17 = 10001, 1's complement of 17 = 01110. For 1's complement 0 is written as 1 and 1 is written as 0.
- A 10 bit A/D conveter is used to digitize an analog signal in the 0 to 6 volt. The maximum peak to ripple voltage that can be allowed in the D.C. supply voltage is
Smallest incremental change = 1 / 2
^{10}= 1 / 1024. So for 6 Volt incremental change = 6 / 1024 = 5.85 mV. - If a counter having 10 flip flops is initially at 0, What count will if hold after 2060 pulses?
In complete one cycle 1024 pulses 2060 / 1024 =2048 / 2 cycles, Balance = 2060 - 2040 = 12 pulses. Binary no. of 12 is = 000 000 1100
- A switch-tail ring counter is made by using a single D-FF, the following circuit is
In a switch tail ring counter, using D FF, the complementary of output ( Q' ) is connected to D input for a single D-FF it becomes a T FF.
- The fast logic family is
ECL ( Emitter coupled logic) is the fast logic family. Because the switching transistors do not go into saturation in either the on / off state. ECL is sensitive to a threshold level only.

Design with by SARU TECH