Electrical Studys

1➤ In an intel 8085A, which is the first machine cycle of an instruction?

A. An op-code fetch cycle B. A memory read cycle C. A memory write cycle D. An I/O read cycle

2➤ The cycle required to fetch and execute an instruction in a 8085 microprocessor is which one of the following?

A. Clock cycle B. Memory cycle C. Machine cycle D. Instruction cycle

3➤ What are the sets of commands in a program which are not translated into machine instructions during assembly process, called?

A. MnemonicsB. Directives C. Identifiers D. Operands

4➤ The processor status word of 8085 microprocessor has five flags namely:

A. S, Z, AC, P, CY B. S, OV, AC, P, CY C. S, Z, OV, P, CY D. S, Z, AC, P, OV

5➤ I)A total of about one million bytes can be directly addressed by the 8086 microprocessor II)8086 has thirteen 16-bit registers III)8086 has eight flags IV)Compared to 8086, the 80286 provides a higher degree of memory protection Which one of the statements given above are correct?

A. 2,3&4 B. 1,3 &4 C. 1,2 & 4 D. 1,2 & 3

6➤ Which one of the following is not correct?

A. Bus is a group of wires B. Bootstrap is a technique or device for loading first instructionC. An instruction is a set of bits that defines a computer operationD. An interrupt signal is required at the start of every program

7➤ A good assembly language programmer should use general purpose registers rather than memory in maximum possible ways for data processing. This is because:

A. Data processing with registers is easier than with memoryB. Data processing with memory requires more instructions in the program than that with registersC. Of limited set of instructions for data processing with memoryD. Data processing with registers takes fewer cycles than that with memory

8➤ Which of the following statements for intel 8085 is correct?

A. Program Counter (PC) specifies the address of the instruction last executedB. PC specifies the address of the instruction being executedC. PC specifies the address of the instruction to be executed D. PC specifies the number of instructions executed so far

9➤ Output of the assembler in machine codes is referred to as

A. Object program B. Source program C. Macroinstruction D. Symbolic addressing

10➤ Inintel 8085A microprocessor ALE signal is made high to

A. Enable the data bus to be used as low order address bus B. To latch data D0-D7 from data bus C. To disable data bus D. To achieve all the functions listed above

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