# Consider a power system with three identical generators. The transmission losses are negligible. One generator (G1) has a speed governor which maintains its speed constant at the rated vaule, while the other generators (G2 and G3) have governors With a droop of 5 %. If the load of the system is increased, then in steady state

1.  generation of G2 and G3 is increased equally while generation of G1 is uncharged

2.  generation of G1 alone is increased while generation G2 and G3 is uncharged

3.  generation of G1, G2 and G3 is increased equally

4.  generation of G1, G2 and G3 is increased in the ratio 0.5 : 0.25 : 0.25

4

generation of G1 alone is increased while generation G2 and G3 is uncharged

Explanation :
No Explanation available for this question

# In a synchronous machine, in case the axis of field flux is in line with the armature flux, the machine is working

1.  as synchronous meter

2.  as synchronous generator

3.  as floating machine

4.  the machine will not work

4

as floating machine

Explanation :
No Explanation available for this question

# An ideal voltage source is connected across a variable resistance. The variation of current as a function of resistance is given by

1.  a straight line passing through the origin

2.  a rectangular hyperbola

3.  a parabola

4.   all of the above

4

a rectangular hyperbola

Explanation :
No Explanation available for this question

# The bandwidth of control system is the range of frequency over which C/R(jω)? is greater than or equal to

1.  1/√2 and it depends only on the undamped natural frequency of the system

2.  1 and it depends only on the damping factor of the system

3.  1 and it depends only on the undamped natural frequency of the system

4.  1/√2 and it depends on the both undamped natural frequency and the damping factor of the system

4

1 and it depends only on the damping factor of the system

Explanation :
No Explanation available for this question

# Pure inductive circuit takes power (reactive) from the a.c . line when

1.  both applied voltage and current rise

2.  both applied voltage and current decrease

3.  applied-voltage decreases but current increases

4.   none of the above

4

both applied voltage and current decrease

Explanation :
No Explanation available for this question

# Bode plot of a stable system is shown in the figure, the transfer function of the system is

1.  G(s)=100/s+10

2.  G(s)=10/s+10

3.  G(s)=1/s+10

4.   None of these

4

G(s)=100/s+10

Explanation :
No Explanation available for this question

# The 3-db bandwidth of a typical second-order system with the transfer function c(s)/R(s) = ω2n/s2 + 2ωns + ω2n is given by

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# An alternator has a phase sequence Of RYB for its phase voltage. In case of field current is reversed, the phase sequence will become

1.  RBY

2.  RYB

3.  YRB

4.  none of these

4

RYB

Explanation :
No Explanation available for this question

# In a synchro error detector, the output voltage is proportional to [ω(t)]n where ω(t) is the rotor velocity and n equals

1.  -2

2.  -1

3.  1

4.  2

4

1

Explanation :
No Explanation available for this question

1.  -2

2.  -1

3.  1

4.  2

4