Electronics and Communication Engineering - Microprocessors

16. 

Z flag is reset if an ALU operation results in 0.

A. True
B. False

Answer: Option B

Explanation:

Z flag is set if ALU operation results in zero.


17. 

The power requirements of a DRAM in active and stand by modes is about

A. 350 mW and 5 mW respectively
B. 350 mW each
C. 5 mW each
D. 350 mW and 100 mW respectively

Answer: Option A

Explanation:

Power requirement in stand by mode is very low 1000.


18. 

Which of the following is not a valid real constant in C?

A. 1.2 e 2.0
B. -2.3 e - 2
C. -2.3 E 2
D. -2.3 e 2

Answer: Option C

Explanation:

In C real constant expressed in exponential form, mantissia and exponent should be separated by e (and not E).


19. 

In a computer the instructions, data, intermediate and final results during processing are held in ALU.

A. True
B. False

Answer: Option B

Explanation:

These are not held in ALU. Only computations are done by ALU.


20. 

The number of storage classes in C is

A. 2
B. 3
C. 4
D. 6

Answer: Option C

Explanation:

C has four storage classes viz. automatic storage class, register storage class, static storage class and external storage class.