Electronics and Communication Engineering - Automatic Control Systems

41.
The system in the given figure
will be unstable due to the presence of positive feedback in the inner loop
may be stabilized by the negative feedback outer loop
can never be stable
will always be stable
Answer: Option
Explanation:

The relative extent of negative and positive feedbacks determines stability.


42.
The units of thermal capacitance are
k cal/°C
°C/k cal
°C sec/k cal
none of the above
Answer: Option
Explanation:

Heat energy (kcal) is analogous to electric charge and temperature is analogous to voltage.

.


43.

Assertion (A): In the given figure open loop transfer function =

Reason (R): The ratio is called feed forward transfer function.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
R is correct but A is wrong
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
Nichols chart consists of M and N locii in log magnitude versus phase diagram.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
If , initial and final values of i(t) are
zero and 1
zero and 10
10 and zero
70 and 80
Answer: Option
Explanation:

Use initial and final value theorems.