# Electronics Engineering (Test 4)

## Tancet Anna University : Ece Electronics And Communication Engineering

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Electronics Engineering
| Electric Circuits | | Electromagnetic | | Signals and Systems | | Control Systems | | Electrical and Electronic Measurements | | Power Electronics | | Electronic Devices | | Analog Circuits | | Digital Circuits | | Digital Logic |
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.
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'
Explaination / Solution:

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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.
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.
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.
Explaination / Solution:

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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
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.
Explaination / Solution:

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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.
Explaination / Solution:

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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
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.