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C-DAC Microprocessor placement questions


In the written test of C-DAC Microprocessor the students can expect objective type of questions.

It has been seen that each question carries 2 marks.

Here are a few questions given below:

From the following questions given below choose the correct alternative: 

Q.1 What is 8251?

(A) UART
(B)USART
(C)Programmable Interrupt controller
(D)Programmable interval timer/counter

Q.2 What does 8088 microprocessor have?

(A)16 bit address bus
(B)4 byte pre-fetch queue
(C)6 byte pre-fetch queue
(D)16 bit data bus

Q.3 If the crystal oscillator is operating at 15 MHz. What will be the PCLK output of 8284?

(A)5 MHz.
(B)2.5 MHz.
(C)7.5 MHz.
(D)10 MHz.
Q.4 In which T-state does the CPU sends the address o memory or I/O and the ALE signal for Demultiplexing 
(A)T3.
(B)T1.
(C)T2.
(D)T4.

Q.5 If a1M1× DRAM requires 4 ms for a refresh and has 256 rows to be refreshed, no more than __________ of time must pass before another row is refreshed. 
(A)4 ms.
(B)4 ns.
(C)0.5 ns.
(D)15.625

Q.6 Where the data is transferred in a DMA write operation?

(A)from I/O to memory.
(B) from memory to I/O.
(C)from memory to memory.
(D)from I/O to I/O.

Q.7 Which type of JMP instruction assembles if the distance is 0020h bytes 

(A)far
(B)near
(C)short
(D)none of the above. 

Q.8 A certain SRAM has 0CS=,0WE=and1OE=. In which of the following modes this SRAM is operating

(A)Read
(B)Write
(C)Stand by
(D)None of the above 

Q.9 Which of the following is true with respect to EE PROM?

(A) contents can be erased byte wise only.
(B) contents of full memory can be erased together.
(C) contents can be erased using ultra violet rays
(D)contents cannot be erased

Q.10 What are Pseudo instructions basically?

(A) instructions that are treated like comments. 
(B)instructions that are ignored by the microprocessor.
(C)assembler directives.
(D)false instructions 
Q.11 What number of the times the instruction sequence below will loop before coming out of loop is MOV AL, 00hA1: INC AL JNZ A1 
(A)00
(B)256
(C)255
(D)001

Q.12 After the following has been executed MOV BL, 8C MOV AL, 7E ADD AL, BL; what will be the contents of register AL?

(A) 0A and carry flag is reset
(B)0A and carry flag is set
(C)6A and carry flag is reset
(D)6A and carry flag is set

Q.13 With which of the following is the direction flag used? 

(A)String instructions.
(B)Stack instructions.
(C)Arithmetic instructions.
(D)Branch instructions. 

Q.14 In what is the ready pin of a microprocessor used

(A)to indicate that the microprocessor is ready to receive inputs.
(B)to indicate that the microprocessor is ready to receive outputs.
(C) to provide direct memory access.. 
(D) to introduce wait states. 

Q.15 These are two ways in which a microprocessor can come out of Halt state.

(A)When hold line is a logical 1.
(B)When interrupt occurs and the interrupt system has been enabled.
(C)When both (A) and (B) are true.
(D) When either (A)or (B) are true.

Q.16 In the instruction FADD, What does F stands for

(A)Floppy
(B)Far
(C)File
(D)Floating

Q.17 What does SD RAM refers to

(A)Synchronous DRAM
(B)Static DRAM
(C)Semi DRAM
(D)Second DRAM

Q.18 In case of DVD, the speed is referred in terms of n X. Here what does X refers to 
(A)150 KB/s
(B)300 KB/s
(C)1.38 MB/s
(D)2.4 MB/s

Q.19 What is the bit size of Itanium processor of Intel?

(A)32 bit microprocessor.
(B)64 bit microprocessor.
(C)128 bit microprocessor.
(D)256 bit microprocessor.

Q.20 When is the LOCK prefix used often?

(A) during normal execution.
(B)during DMA accesses
(C)during memory accesses
(D)during interrupt servicing

Q.21 The Pentium microprocessor has how many execution unit?

(A)1
(B)2
(C)3
(D)4

Q.22 How is EPROM generally erased 

(A) by using Ultraviolet rays 
(B) by infrared rays
(C) by 12 V electrical pulse
(D) by 24 V electrical pulse

Q.23 Signal voltage ranges for a logic high and for a logic low in RS-232C standard are

(A)Low = 0 volt to 1.8 volt, high = 2.0 volt to 5 volt
(B)Low =-15 volt to –3 vol, high = +3 volt to +15 volt
(D)Low = +3 volt to +15 volt, high = -3 volt to -15 volt
(E)Low = 2 volt to 5.0 volt, high = 0 volt to 1.8 volt

Q.24 The PCI bus is the important bus found in all the new Pentium systems because

(A)It has plug and play characteristics
(B)It has ability to function with a 64 bit data bus
(C)Any Microprocessor can be interfaced to it with PCI controller or bridge
(D)All of the above

Q.25 Which of the following is a true statement?

(A)The group of machine cycle is called a state.
(B)A machine cycle consists of one or more instruction cycle.
(C)An instruction cycle is made up of machine cycles and a machine cycle is made up of number of states.
(D)None of the above

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