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Number of Questions: 30
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In which of the following logic gates, the output is OFF only when both the inputs are ON?

  1. NOT

  2. Ex-NOR

  3. NAND

  4. Half Adder

  5. Conversion Rate


Correct Option: C
Explanation:

Here, the output is OFF only when both the inputs are ON.

In which of the following, each operand datum occupies one byte in 8086 processor?

  1. DW

  2. DB

  3. DD

  4. HLT

  5. Register Addressing Mode


Correct Option: B
Explanation:

Each operand datum occupies one byte in 8086 processor.

In which, a latching circuit timed with the clock signal would most likely have to be connected to the IGFET gate to ensure full discharge of the capacitor when the comparator's output goes high?

  1. R-2R Ladder DAC

  2. Flash Type ADC

  3. Single Slope Integrating ADC

  4. Tracking Converter

  5. Half Subtractor


Correct Option: C
Explanation:

Here, a latching circuit timed with the clock signal would most likely have to be connected to the IGFET gate to ensure full discharge of the capacitor when the comparator's output goes high.

In which of the following, the output is ON only when any one of the inputs were ON, and output is OFF if both inputs are at the same logic?

  1. Step Recovery

  2. Half Adder

  3. NOT Logic

  4. Ex-NOR Logic Gate

  5. Ex-OR Logic Gate


Correct Option: E
Explanation:

The output is ON only when any one of the inputs were ON and output is OFF if both inputs are at the same logic.

Which of the following accepts three 1 bit inputs and generate a Sum and a Carry output?

  1. Half Adder

  2. Full Adder

  3. Half Subtractor

  4. Ex-NOR Logic Gate

  5. Tracking Converter


Correct Option: B
Explanation:

 Full Adder :
The Full Adder accepts three 1 bit inputs and generates a Sum and a Carry output.

Which of the following flags is set to 1, if the low-order 8 bits of the result contains an even number of 1's otherwise it is cleared in 8086 processor?

  1. Overflow Flag

  2. Direction Flag

  3. Trap Flag

  4. Parity Flag

  5. X1 and X2


Correct Option: D
Explanation:

This flag is set to 1 if the low-order 8 bits of the result contains an even number of 1's, otherwise it is cleared in 8086 processor.

Which should be used to clock a latch and hold circuit such as a 74LS245 or 74LS373?

  1. Address Lines

  2. Address Data Lines

  3. Address Latch Enable

  4. Status Lines

  5. Trap


Correct Option: C
Explanation:

It should be used to clock a catch and hold circuit such as 74LS245 or 74LS373.

Which of the following line indicates that the 8085 micro processor is going to send data away from itself?

  1. Trap

  2. X1 & X2

  3. Address Lines

  4. HALT

  5. WRITE


Correct Option: E
Explanation:

This line indicates that the 8085 micro processor is going to send data away from itself.

Which line indicates that the 8085 micro processor is expecting data to be fed to it?

  1. MVI Group

  2. READ

  3. TRAP

  4. X1 & X2

  5. Address Lines


Correct Option: B
Explanation:

This line indicates that the 8085 micro processor is expecting data to be fed to it.

Which of the following logic circuits takes n inputs lines and provides pow(2,n) output lines?

  1. Encoder

  2. Demultiplexer

  3. Half Adder

  4. Decoder

  5. NOT Logic


Correct Option: D
Explanation:

It takes n input lines and provides pow(2,n) output lines.

In which circuit, if any of the input resistor is different, the input voltages would have different degrees of effect on the output and the output voltage would not be a true sum?

  1. R-2R Ladder ADC

  2. Binary Weighted Input ADC

  3. Flash Type ADC

  4. Half Adder

  5. Resolution


Correct Option: B
Explanation:

Here, if any of the input resistor is different, the input voltages would have different degrees of effect on the input and the output voltage would not be a true sum.

Which of the following instructions permit the accumulator to access groups of data bytes, as may be necessary with long precision arithmetic in 8085 processor?

  1. LDAX and STAX

  2. LXI Instruction

  3. LDA and STA

  4. ADD instructions

  5. Stack pointer


Correct Option: A
Explanation:

These instructions permit the accumulator to access groups of data bytes, as may be necessary with long precision arithmetic in 8085 processor.

Which of the following logic circuits takes data in parallel from several sources and send the data out serially on one line in a time sequence?

  1. Demultiplexer

  2. Encoder

  3. Half Subtractor

  4. Half Adder

  5. Multiplexer


Correct Option: E
Explanation:

Multiplexers take data in parallel from several sources and send the data out serially on one line in a time sequence.

Which indicates when two numbers are equal or which number is greater than the other?

  1. Encoder

  2. Magnitude Comprartor

  3. Demultiplexer

  4. Half Adder

  5. Ex-NOR Logic Gate


Correct Option: B
Explanation:

It indicates when two numbers are equal or which number is greater than the other.

Which of the following instructions provides a quick means of adding one to the contents of a register or memory location in 8085 processor?

  1. ADD Instruction

  2. ADD Immediate

  3. Increment Instruction

  4. AND Immediate

  5. LXI Instruction


Correct Option: C
Explanation:

These instructions provide a quick means of adding one to the contents of a register or memory location in 8085 processor.

Which of the following instructions provides a means of subtracting 1 from the contents of a register or a memory location in 8085 processor?

  1. Decrement Instruction

  2. Subtract Instruction

  3. Subtract Immediate

  4. AND Immediate

  5. LDA and STA


Correct Option: A
Explanation:

These instructions provide a means of subtracting 1 from the contents of a register or a memory location in 8085 processor.

Which of the following instructions perform a logical AND function between the specified byte, either in a register or in the address contained in the H and L registers, and the contents of the accumulator?

  1. AND Immediates

  2. ADD Instructions

  3. ADD Immediates

  4. AND Instructions

  5. MVI Group


Correct Option: D
Explanation:

These instructions perform a logical AND function between the specified byte, either in a register or in the address contained in the H&L registers, and the contents of the accumulator in 8085 processor.

In which of the following, the highest value input digit is encoded and any other active input is ignored?

  1. Enocoder

  2. Priority Encoder

  3. Demultiplexer

  4. Half Subtractor

  5. NOT Logic Gate


Correct Option: B
Explanation:

In a priority encoder, the highest value input digit is encoded and any other active input is ignored.

In which circuit, all the flip-flops are simultaneously triggered from the same clock input?

  1. Serial-in, Serial-out Shift Register

  2. Serial in, Parallel out Shift Register

  3. Ring Counters

  4. Synchronous Counter

  5. Demultiplexer


Correct Option: D
Explanation:

It is one in which all the flip-flops are simultaneously triggered from the same clock input.

Which of the following is used for error detection in digital codes?

  1. Sum bit

  2. Carry bit

  3. Parity bit

  4. Code Converter

  5. Gray Code


Correct Option: C
Explanation:

These bits are used for error detection in digital codes.

Which instructions perform inclusive Or's between the specified byte, either in a register or in the address contained in the H&L registers and the contents of the accumulator in 8085 processor?

  1. OR Instructions

  2. MVI Group

  3. ADD Instructions

  4. Ex-OR Instructions

  5. LXI Instruction


Correct Option: A
Explanation:

These instructions perform inclusive OR's between the specified byte, either in a register or in the address contained in the H&L registers and the contents of the accumulator in 8085 processor.

Which situates various bits to form masks or generate output data via the SOD line in 8085 processor?

  1. Interrupt Mask Bits D0, D1, D2

  2. Interrupt Enable Bit

  3. Set Interrupt Mask

  4. TRAP

  5. Halt


Correct Option: C
Explanation:

It situates various bits to form masks or generate output data via SOD line in 8085 processor.

Which instructions perform Exclusive Or's functions between a specified byte, either in a register or in a byte contained in the address in the H&L registers, and the contents of the accumulator in 8085 processor?

  1. ADD Instruction

  2. Ex-OR Instructions

  3. OR Instructions

  4. AND Instructions

  5. LXI Instruction


Correct Option: B
Explanation:

These instructions perform Exclusive Or's functions between a specified byte, either in a register or in a byte contained in the address in the H&L registers, and the contents of the accumulator in 8085 processor.

Which of the following instructions compares the contents of the accumulator to a fixed value provided by the second byte of the instructions?

  1. Compare Immediate

  2. Compare Instruction

  3. Ex-OR Immediate

  4. OR Instruction

  5. AND Instruction


Correct Option: A
Explanation:

This instruction compares the contents of the accumulator to a fixed value provided by the second byte of the instruction in 8085 processor.

In which of the following circuits, the mode control may control the direction of shifting in some real devices and the data will be shifted one bit position for each clock pulse?

  1. Serial-in, Parallel-out Shift Register

  2. Ring Counter

  3. Synchronous Counter

  4. Parralel-in, Parallel-out Shift Register

  5. Latch


Correct Option: D
Explanation:

The mode control may control the direction of shifting in some real devices and the data will be shifted one bit position for each clock pulse.

Which of the following flags is set to 1 if the result is zero, and 0 if the result is non zero in 8086 processor?

  1. Condition Flag OF

  2. Condition Flag DF

  3. Condition Flag TF

  4. BX

  5. Condition Flag ZF


Correct Option: E
Explanation:

This flag is set to 1 if the result is zero and 0 if the result is nonzero in 8086 processor.

Which instruction permits the system to examine the interrupt mask by loading into the A register a byte which defines the condition of the mask bits for the maskable interrupts in 8085 processor?

  1. Interrupt Mask Bits D0, D1, D2

  2. Interrupt Enable Bit D3

  3. Read Interrupt Mask

  4. Trap

  5. X1 & X2


Correct Option: C
Explanation:

This instruction permits the system to examine the interrupt mask by loading into the A register a byte which defines the condition of the mask bits for the maskable interrupts in 8085 processor.

In which of the following, the complement output of a ring counter is fed back to the input instead of the true output?

  1. Johnson Counter

  2. Ring Counter

  3. Serial-in, Parallel-out Shift Register

  4. Decade Counter

  5. Latch


Correct Option: A
Explanation:

If the complement output of a ring counter is fed back to the input instead of the true output, a Johnson Counter results.

Which instruction includes the carry flag in the circle in 8086 processor?

  1. HLT

  2. RCR

  3. DW

  4. DD

  5. TRAP


Correct Option: B
Explanation:

This instruction includes the carry flag in the circle in 8086 processor.

In which of the following circuits, the high-to-low transition of the comparators's output will cause the shift register to load whatever binary count is being output by the counter, thus updating the ADC circuit's output?

  1. Staircase Ramp ADC

  2. Single-slope Integrating ADC

  3. Dual Slope Integrator ADC

  4. Flash Type ADC

  5. Resolution


Correct Option: A
Explanation:

The high-to-low transition of the comparator's output will cause the shift register to load whatever binary count is being output by the counter, thus updating the ADC circuit's output.

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