1
GATE CSE 2024 Set 1
MCQ (Single Correct Answer)
+1
-0.33

Which one of the following statements is FALSE?

A

In the cycle stealing mode of DMA, one word of data is transferred between an I/O device and main memory in a stolen cycle

B

For bulk data transfer, the burst mode of DMA has a higher throughput than the cycle stealing mode

C

Programmed I/O mechanism has a better CPU utilization than the interrupt driven I/O mechanism

D

The CPU can start executing an interrupt service routine faster with vectored interrupts than with non-vectored interrupts

2
GATE CSE 2023
Numerical
+1
-0

A keyboard connected to a computer is used at a rate of 1 keystroke per second. The computer system polls the keyboard every 10 ms (milli seconds) to check for a keystroke and consumes 100 $$\mu$$s (micro seconds) for each poll. If it is determined after polling that a key has been pressed, the system consumes an additional 200 $$\mu$$s to process the keystroke. Let $$T_1$$ denote the fraction of a second spent in polling and processing a keystroke.

In an alternative implementation, the system uses interrupts instead of polling. An interrupt is raised for every keystroke. It takes a total of 1 ms for servicing an interrupt and processing a keystroke. Let $$T_2$$ denote the fraction of a second spent in servicing the interrupt and processing a keystroke.

The ratio $${{{T_1}} \over {{T_2}}}$$ is __________. (Rounded off to one decimal place)

Your input ____
3
GATE CSE 2022
MCQ (Single Correct Answer)
+1
-0.33

Which one of the following facilitates transfer of bulk data from hard disk to main memory with the highest throughput?

A
DMA based I/O transfer
B
Interrupt driven I/O transfer
C
Polling based I/O transfer
D
Programmed I/O transfer
4
GATE CSE 2021 Set 2
Numerical
+1
-0
Consider a computer system with DMA support. The DMA module is transferring one 8-bit character in one CPU cycle from a device to memory through cycle stealing at regular intervals. Consider a 2 MHz processor. If 0.5% processor cycles are used for DMA, the data transfer rate of the device is __________ bits per second.
Your input ____
GATE CSE Subjects
Software Engineering
Web Technologies
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