Ans. A
Question ask about stability which is obtained from poles of closed loop transfer function( poles are denominator of the transfer function)

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Ans . C

AC - stands for accumulator, it is a register provided in microprocessor/micro controller to store temporary result after ALU performs operation on input Data.

SP --Stack pointer is used to store data on top of Stack(a set of memory location).it is utilized during execution of Jump instructions to store address of next instruction to be executed. it can also be used to store data by using instructions PUSH(to store the data) and POP (to retrieve the data).

HL--it is 16 bit temporary register inbuilt in microprocessor.They are also called as Memory registers.

PC--Program counter is used to store the address of next instruction to be executed.

Ans. B

Now there may be various method to solve it but if we consider basic methods such as 

1. Mesh analysis.
2. Node analysis.

Consider mesh analysis above circuit consist of Supermesh (current source common between common branch e.g. 2A current source in above ckt.) so number of equation required will be 2(one for super mesh and other for loop without super mesh )

but if we consider node analysis only single equation suffice need, so using node analysis we get

At node X,

I1 +  2 = I2

4 - 3 Vab  - Vab  = -20

Vab = 6

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Answer:   D

Any system with base "Z" consist of elements equal to Z (e.g suppose Z=2 i.e. binary it will consist of 2 elements as 0 and 1) and magnitude of element in collection must be maximum upto Z-1

(e.g. suppose Z=2 as consider above then maximum amplitude that an element possesses in this base is "1" [Z-1=2-1=1]).

Consider above problem, number given is 132 so max. amplitude element is "3" so base should be 

Z-1=3

Z=4

so base should be at least 4 to represent 132.so base 2 is invalid since it is less than 4.