# A synchronous generator connected to an infinite bus delivers power at a lag p.f. If its excitation is increased

1.  the terminal voltage increases

2.  voltage angle S increases

3.  current delivered increases

4.   all of these

4

current delivered increases

Explanation :
No Explanation available for this question

# A motor is receiving 25% of the power that it is capable of receiving from an infinite bus. If load of the motor is doubled, then maximum value of δ during swinging of the rotor around its new equilibrium position will be

1.  400

2.  > 300

3.  < 300

4.  250

4

> 300

Explanation :
No Explanation available for this question

# The asymptotic Bode plot of the transfer function K/1+s/2 is given  in the figure. The error in the phase angle and db gain at frequency of ω=0.5 a are respectively

1.  4.06o,0.97 db

2.  5.7o,3 db

3.  4.9o,3db

4.  5.7o,0.97 db

4

4.06o,0.97 db

Explanation :
No Explanation available for this question

# A 10 KVA, 400 V/200 V single phase transformer with 10 % impedance draws a steady short circuit line current of

1.  50A

2.  150A

3.  250A

4.   350A

4

150A

Explanation :
No Explanation available for this question

# The system having the Bode magnitude plot shown in the figure has the transfer function

1.  60(s+0.01)(s+0.1)/s2(s+0.05)2

2.  10(1+10s)/s(1+20s)

3.  3(s+0.05)/s(s+0.1)(s+1)

4.  5(s+0.1)/s(s+0.05)

4

5(s+0.1)/s(s+0.05)

Explanation :
No Explanation available for this question

# The percentage resistance and percentage reactance of a 10 KVA, 400 V/200 V, 3-phase transformer are 2% and 10% respectively. If the constant losses in the machine are 1 %, the maximum possible percentage efficiency of the transformer is

1.  98.32

2.  97.25

3.  96.85

4.   96.12

4

96.85

Explanation :
No Explanation available for this question

# The  asymptotic approximation of the log magnitude versus frequency plot of a minimum phases system with real poles and one zero is shown in the figure. Its transfer function is

1.  20(s+5)/s(s+2)(s+25)

2.  10(s+5)/(s+2)s2(s+25)

3.  20(s+5)/s2(s+2)(s+25)

4.  50(s+5)/s2(s+2)(s+25)

4

50(s+5)/s2(s+2)(s+25)

Explanation :
No Explanation available for this question

# The steady state error corresponding to a ramp input is

1.  0.25

2.  0.2

3.  0

4.  ∞

4

0.25

Explanation :
No Explanation available for this question

# The damping ratio is

1.  0.063

2.  0.17

3.  0.483

4.  0.639

4

0.17

Explanation :
No Explanation available for this question

1.  -2,-2

2.  -2,-1

3.  -2,j

4.  -2,2

4