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115.

P is a 16-bit signed integer. The 2’s complement representation of P is (F87B)₁₆. The 2’s complement representation of 8*P is [1 mark]
(A) (C3D8)₁₆
(B) (187B)₁₆
(C) (F878)₁₆
(D) (987B)₁₆

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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116.

A main memory unit with a capacity of 4 megabytes is built using 1M 1-bit DRAM chips. Each DRAM chip has 1K rows of cells with 1K cells in each row. The time taken for a single refresh operation is 100 nanoseconds. The time required to perform one refresh operation on all the cells in the memory unit is [1 mark]
(A) 100 nanoseconds
(B) 100*2¹⁰ nanoseconds
(C) 100*2²⁰ nanoseconds
(D) 3200*2²⁰ nanoseconds

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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117.

The minterm expansion of f(P, Q, R) = PQ + QR + PR is [1 mark]
(A) m₂+ m₄ + m₆ + m₇
(B) m₀ + m₁ + m₆ + m₇
(C) m₀ + m₁ + m₃ + m₅
(D) m₂ + m₃ + m₄ + m₅

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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118.

What is the value of Lim_n→∞ (1- 1/n)²ⁿ [1 mark]
(A) 0
(B) e^-2
(C) e^-1/2
(D) 1

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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119.

Consider the set S = {1,ω ,ω² }, where ω and ω² are cube roots of unity. If * denotes the multiplication operation, the structure {S, *} forms [1 mark]
(A) a group
(B) a ring
(C) an integral domain
(D) a field

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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120.

What is the possible number of reflexive relations on a set of 5 elements? [1 mark]
(A) 2¹⁰
(B) 2¹⁵
(C) 2²⁰
(D) 2²⁵

last reply by CpjJwWHV • 14 years ago • asked in Computer Science And Engineering, 2010

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