The gain margin of a unity feedback control system with the open loop transfer function G(s)=(s+1)/s2 is:

1.  0

2.  1/√2

3.  √2

4.  ∞

View Answer  
4
Correct Answer :

∞


Explanation :
No Explanation available for this question

In the matrix equation Px=q,which of the flowing is a necessary condition for the existence of at least one solution for the unknown vector x:

1.  Augmented matrix [P q] must have the same rank as matrix P

2.  Vector q must have only non-zero elements

3.  Matrix P must be singular

4.  Matrix P must be square

View Answer  
4
Correct Answer :

Augmented matrix [P q] must have the same rank as matrix P


Explanation :
No Explanation available for this question

If P and Q are two random events,then the following is TRUE:

1.  Independence of P and Q implies that probability (P ∩ Q) = 0

2.  Probability (P ∪ Q) > Probability (P) = Probability (Q)

3.  If P and Q are mutually exclusive,then they must be independent

4.  Probability (P ∩ Q) < Probability (P)

View Answer  
4
Correct Answer :

Probability (P ∩ Q) < Probability (P)


Explanation :
No Explanation available for this question

If , then S has the value

1.  -1/3

2.  1/4

3.  1/2

4.  1

View Answer  
4
Correct Answer :

1/2


Explanation :
No Explanation available for this question

The solution of the first order differential equation x(t) =-3x(t),x(0)=x0 is:

1.  x(t)=X0e-3t

2.  x (t) = X0e-3

3.  x (t) =x0e-t/3

4.  x (t) = X0e-t

View Answer  
4
Correct Answer :

x(t)=X0e-3t


Explanation :
No Explanation available for this question

The equivalent circuit of a transformer has leakage reactanceX1, X’2 and magnetizing reactance XM.Their magnitudes satisfy

1.  x1 X’2 ? XM

2.  X1  X’2 ? XM

3.  X1 = X’2 ? XM

4.  X1 = X’2 ? XM

View Answer  
4
Correct Answer :

X1 = X’2 ? XM


Explanation :
No Explanation available for this question

Which three-phase connection can be used in a transformer to introduce a phase difference of 30° between its output and corresponding input line voltages

1.  Star - Star

2.  Star - Delta

3.  Delta - Delta

4.  Delta - Zigzag

View Answer  
4
Correct Answer :

Star - Delta


Explanation :
No Explanation available for this question

On the torque/speed curve of induction motor shown in Fig.below,four points of operation are market as W, X, Y and Z.Which one of them represents the operation at a slip greater than 1

1.  W

2.  X

3.  Y

4.  Z

View Answer  
4
Correct Answer :

W


Explanation :
No Explanation available for this question

For an induction motor,operating at a slip s,the ratio of gross power output to air gap power is equal to:

1.  (1 - s)2

2.  (1 - s)

3.  √(1 - s)

4.  (1 -√s)

View Answer  
4
Correct Answer :

(1 - s)


Explanation :
No Explanation available for this question

The p.u. parameters for a 500 MVA machine on its own base are inertia M=20 p.u;reactance X=2 p.u.The p.u. values of inertia and reactance on 100 MVA common base,respectively are

1.  4,0.4

2.  100,10

3.  4,10

4.  100,0.4

View Answer  
4
Correct Answer :

100,0.4


Explanation :
No Explanation available for this question
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