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MCQ from PREVIOUS YEARS PSU EXAMINATIONS

Likhitha Darsi
GATE EE AIR-382,DISC FROM IIT MADRAS, interviewed by BARC,IOCL,PGCIL,APGDC Junior Executive in AAI Interested in reading books and watching

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1. MCSs ON BOOLEAN AL GEBRA, LOGIC GATES AND K- MAPS DARSI LI KH THA

2. ) AssexkonBoolean AeBin ben system Alqe bra on umbe system ane ssetion emen o m each oten There e some penormed in boolean Alebra Reason (R): basic openaon ike AND, oR and NoT which ane (a) Bolh A om R are true omd is correct explanaton f A UA fase butR irue Bo.Ilean Algebraa Bin :In (d) A numb e SusFenn Syshem ane elent bina stem = lo ut in boolean 1+1=1- n lke ANo, OR, NoT cant be med i Binany ^^tem enatonA -) Balh are true but Ris not correct explanation Assenton Sentior

3. (e) Acoyding to De Morgan heovem I NoR gate is eauivalenbabbled NAND 3ate individual vasiables cam be 91emoved fiom unden NOT sign and SoP com be trans formed 2 o POS 3. Complement of product of variables s eaual to sum 4' NAND gate 'b 5 ndividual variables can hemoved in dividual comblements cqui valent to bubbledoR a be nem oved Unden NOT sign be tansforme amd Pos cam to SOP whch of above s r NOT Correct? NAND aae: NOR Bubbled NAND Bubbled NOR A8 ate OR gate gate = ANDgate At8 8 6 C D A-5 A +8 8

4. (S) (oriden the llowina statements associated ith Boolean Algebra ebra 1. Thene is ike subtraction Y division in Boolean Algebra 2. Tene is hossibili, having ov factional numbers 3. A variable has no numenica fcance 4. Logical uicaon is same as AND, logical addhon is same 5 There ae only tree constants within the booleanm negati ve a chon umbenk as oR obena-ho system which of abore ane correck ? N ossibik, op negative Y factoral numbers only two constants (o, oolean Algtbha 0,in ebia

5. (Q) The expression f= (A%)((+6) aften den, organization reaolks into (a) (A B C+D (b) AB CD AB+cD None (9) The dualf e expresi on (a) o (b(CA d None of these am Dual of fun chon-) change + to an and to . I to O 9ff: A+Ra, Dual will be A.A20 and ent wil be A+Ai=- Com plem

6. (e) Match ust (Bodlean exresion) t st I m Minimized expresi on and select the co answen using odes Codes list 1. A +8 2. AB+C ist I 8 A. A (A+B) (a) 3 2 4 3. A (c)2 3 4