# 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.  ∞

4

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

4

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)

4

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

4

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

4

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

4

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

4

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

4

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)

4

(1 - s)

Explanation :
No Explanation available for this question

1.  4,0.4

2.  100,10

3.  4,10

4.  100,0.4

4