INTERVIEW QUS ON MP

 INTERVIEW QUS ON MP

 
Our 50+ Microprocessor questions and answers focus on all areas of Microprocessor subject covering the most important topics in the Microprocessor. These topics are chosen from a collection of most authoritative and best reference books on Microprocessor.

1	What does microprocessor speed depend on?
	a)Clock	b)Data bus width
	c)Address bus width	d)Control bus width
2	Why 8085 Processor called an 8-bit processor?
	a)Because the 8085 processor has 8-Bit ALU.	b)Because the 8085 processor has an 8-Bit data bus.
	c)Both because the 8085 processor has 8-Bit ALU and because the 8085 processor has an 8-Bit data bus.	d)none of these
3	Which one is not a flag bit
	a)Parity	b)Cary
	c)Sign	d)Operand
4	What is the maximum number of memory locations supported by 8085?(Probable duplicate)
	a)10000	b)32768
	c)65536	d)No limit
5	Name of the program responsible to transfer hex input to binary is
	a)System Program	b)Application Program
	c)Compiler	d)Monitor Program
6	HLT is a _______ instruction
	a)1 Byte	b)2 Byte
	c)3 Byte	d)4 Byte
7	Which is not a valid register pair?
	a)BC	b)DE
	c)HL	d)BL
8	Which flag is used for BCD Addition?(Probable duplicate)
	a)Carry	b)Auxiliary Carry
	c)Parity	d)Sign
9	Which is a 16 bit register?
	a)Accumulator	b)Flag
	c)Program Counter	d)Register C
10	LDA 8050H requires ____ numbers of machine cycle
	a)3	b)1
	c)4	d)none of these
11	How many T-States are there in STA 8050H instruction?(Probable duplicate)
	a)9	b)10
	c)11	d)13
12	Which one is closely related to the Clock pulse?
	a)Instruction Cycle	b)Machine Cycle
	c)T-States	d)None of these
13	Which combination of S1 and S0 is for Halt?(Probable duplicate)
	a)00	b)01
	c)10	d)11
14	Which stack is used in 8085?
	a)FIFO	b)LIFO
	c)FILO	d)None of these
15	What are the Control signals used for DMA operation?(Probable duplicate)
	a)INT and INTA	b)IN and OUT
	c)HOLD and HLDA	d)None of these
16	What is a SIM?(Probable duplicate)
	a)Select Interrupt Mask	b)Sorting Interrupt Mask
	c)Set Interrupt Mask	d)None of these
17	Vector Address of RST 3 is
	a)0020H	b)0018H
	c)0081H	d)None of these
18	Address line for RST3 is?
	a)0020H	b)0028H
	c)0018H	d)0038H
19	Addressing mode of STA 8055H instruction is
	a)Immediate	b)Implied
	c)Stack	d)Memory Direct
20	MVI B, 60H is _____ Byte instruction
	a)1	b)2
	c)3	d)None of these
21	The interrupt line having highest priority is
	a)RST 7.5	b)TRAP
	c)Both RST 7.5 and TRAP	d)None of these
22	Stack Pointer is a _________ register
	a)4 bit	b)8 bit
	c)16 bit	d)None of these
23	DAD D is a _______ instruction
	a)1 Byte	b)2 Byte
	c)3 Byte	d)4 Byte
24	When DMA controller works as a normal peripheral device, it acts in(Probable duplicate)
	a)Master Mode	b)Slave Mode
	c)both Master Mode & Slave Mode	d)None of these
25	In ADD C instruction, one of the operands is stored in
	a)Stack Memory	b)Accumulator
	c)Main Memory	d)None of these
26	What is the clock frequency of an 8085 Microprocessor?
	a)6 MHz	b)4 MHz
	c)3 MHz	d)None of these
27	RD pin of 8085 is _______ and ________
	a)Active low, Input	b)Active low, Output
	c)Active High, Input	d)Active High, Output
28	Which flag is associated with JNC 8050H instruction?
	a)Zero	b)Sign
	c)Carry	d)Auxiliary Carry
29	Which flag is associated with JNZ 8050H instruction?
	a)Zero	b)Parity
	c)Carry	d)Sign
30	HLT op-code means
	a)Load data to accumulator	b)Store result in memory
	c)Load accumulator with content of register	d)End of program
31	Length of the instruction POP D is
	a)1 Byte	b)2 Byte
	c)3 Byte	d)4 Byte
32	XCHG instruction exchanges the content of H-L with ______ register pair.
	a)BC	b)DE
	c)PSW	d)SP
33	To interface a memory with 2048 locations, how many address lines will be used?
	a)10	b)11
	c)12	d)16
34	In peripheral-mapped-I/O, every device address is of
	a)8 bit	b)16 bit
	c)24 bit	d)32 bit
35	The advantage of memory mapped I/O over I/O mapped I/O is
	a)Faster	b)Many instructions supporting memory mapped I/O
	c)Require a bigger address decoder	d)All of these
36	An interrupt in which the external device supplies its address as well as the interrupt requests is known as
	a)Vectored interrupt	b)Maskable interrupt
	c)Non maskable interrupt	d)Designated Interrupt
37	Number of Hex digits needed to represent the 16-bit address of a memory location are
	a)3	b)4
	c)5	d)6
38	Priority Encoder essentially is a
	a)Encoder	b)Decoder
	c)R/W memory	d)Multiplexer
39	Third state of a tri-state device is
	a)High	b)Low
	c)High-Impedance	d)both high and low
40	Address bus width of Intel 8086 is
	a)10 bit	b)8 bit
	c)16 bit	d)20 bit
41	Total addressable memory location supported by Intel 8086 is
	a)28	b)210
	c)216	d)220
42	Full form of OF in Intel 8086 microprocessor is
	a)Overflow Flag	b)Overdue Flag
	c)One Flag	d)Over Flag
43	in Intel 8086 microprocessor, the work of EU is
	a)Encoding	b)Decoding
	c)Processing	d)Calculation
44	In Intel 8086, ________ is used to write into the memory
	a)RD	b)WR
	c)RD/WR	d)CLK
45	The RD, WR, M/IO are the heart of control for ________ mode(Probable duplicate)
	a)Minimum	b)Maximum
	c)Compatibility	d)Control
46	The ___________ pin is used to select direct command word
	a)A0	b)D7
	c)D6	d)A12
47	The _____ is used to connect more microprocessor(Probable duplicate)
	a)Peripheral	b)Cascade
	c)I/O devices	d)Control unit
48	ALE stands for
	a)Address Level Enable	b)Address Latch Enable
	c)Address Leak Extension	d)Address Leak Enable
49	The instruction, MOV AX, 0005H belongs to the address mode
	a)Register	b)Direct
	c)Immediate	d)Register Relative
50	NOP instruction introduces
	a)Address	b)Delay
	c)Memory Location	d)None of these