# Electrical Engineering (Test 4)

## Tancet Anna University : Eee Electrical And Electronics Engineering

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Q.1
The Boolean expression for the output f of the multiplexer shown below is A. B. P ⊕ Q ⊕ R
C. P + Q + R
D. Answer : Option A
Explaination / Solution:
No Explaination.

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Q.2
Which one of the following expressions does NOT represent exclusive NOR of x and y?
A. xy + x 'y'
B. x ⊕ y'
C. x '⊕ y
D. x '⊕ y'
Answer : Option D
Explaination / Solution: Workspace
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Q.3
What is the Boolean expression for the output f of the combinational logic circuit of NOR gates given below? A. B. C. D. Answer : Option B
Explaination / Solution:
No Explaination.

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Q.4
In the circuit shown below, Q1 has negligible collector-to-emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If Vcc is +5V, X and Y are digital signals with 0V as logic 0 and Voc as logic 1, then the Boolean expression for Z is A. XY
B. C. D. Answer : Option B
Explaination / Solution:
No Explaination.

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Q.5
Consider the following circuit which uses a 2-to-1 multiplexer as shown in the figure below. The Boolean expression for output F in terms of A and B is A. B. C. A + B
D. Answer : Option D
Explaination / Solution: Workspace
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Q.6
When a “CALL Addr” instruction is executed, the CPU carries out the following sequential operations internally: Note: (R) means content of register R ((R)) means content of memory location pointed to by R PC means Program Counter SP means Stack Pointer
A. (SP) incremented (PC) ←Addr ((SP)) ←(PC)
B. (PC) ←Addr ((SP)) ←(PC) (SP) incremented
C. (PC) ←Addr (SP) incremented ((SP)) ←(PC)
D. ((SP)) ←(PC) (SP) incremented (PC) ←Addr
Answer : Option D
Explaination / Solution:
No Explaination.

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Q.7
In the following circuit, X is given by A. B. C. X = AB + BC + AC
D. Answer : Option A
Explaination / Solution: Workspace
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Q.8
For the circuit shown in the following, IIare inputs to the 4:1 multiplexers, R(MSB) and S are control bits.
The output Z can be represented by A. B. C. D. Answer : Option A
Explaination / Solution:  Workspace
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Q.9
In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected Such an interrupt is
A. non-maskable and non-vectored
B. maskable and non-vectored
C. non-maskable and vectored
D. maskable and vectored
Answer : Option D
Explaination / Solution:

Vectored interrupts : Vectored interrupts are those interrupts in which program control transferred to a fixed memory location. Maskable interrupts : Maskable interrupts are those interrupts which can be rejected or delayed by microprocessor if it is performing some critical task.

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Q.10
The Boolean expression converted into the canonical product of sum (POS) form is
A. B. C. D. Answer : Option A
Explaination / Solution:

We have the SOP Boolean form,  Hence, in POS form, we have Workspace
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