NIELIT 2017 July Scientist B (CS) - Section B: 22

Question

What is the average Access Time for a drum rotating at $4000$ revolutions per minute?

• A. $2.5$ milliseconds
• B. $5.0$ milliseconds
• C. $7.5$ milliseconds
• D. $4.0$ milliseconds

Comments

Same question

https://gateoverflow.in/9485/what-average-access-time-drum-rotating-revolutions-minute

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option c) 7.5 ms

Answer 1

Option C

$1 minute=4000$ $revolution$

$60 sec=4000$ $revolution$

$1 sec=4000/60$ $revolution$

$or$ $we$ $can$ $say$ $1$ $revolution=60/4000 sec=15 millisecond$

 $average$ $ access$ $time$ $for$ $a$ $Drum$ = $time$ $in$ $half$ $revolution $

                                                    $=15/2$

                                                    $= 7.5millisecond$