# What is the maximum efficiency (in %) at unity pf load

1.  95.1

2.  96.2

3.  96.4

4.  98.1

4

96.2

Explanation :
No Explanation available for this question

# The post fault voltages at buses 1 and 3 in per unit respectively are

1.  0.24, 0.63

2.  0.31, 0.76

3.  0.33, 0.67

4.  0.67, 0.33

4

0.67, 0.33

Explanation :
No Explanation available for this question

# The per unit fault feeds  from generators connected to buses 1 and 2 respectively are

1.  1.20, 2.51

2.  1.55, 2.61

3.  1.66, 2.50

4.  5.00, 2.50

4

5.00, 2.50

Explanation :
No Explanation available for this question

# The minimum time in µsec for which the SCR M should be ON is

1.  280

2.  140

3.  70

4.  0

4

140

Explanation :
No Explanation available for this question

# The average output voltage of the chopper will be

1.  70 V

2.  47.5 V

3.  35 V

4.  0 V

4

35 V

Explanation :
No Explanation available for this question

# The common emitter forward current gain of the transistor shown is βF = 100.The transistor is operating in

1.  Saturation region

2.  Cutoff region

3.  Reverse active region

4.  Forward active region

4

Reverse active region

Explanation :
No Explanation available for this question

# The three-terminal linear voltage regulator is connected to a 10 load resistor as shown in the figure. If Vin is 10 V, what is the power dissipated in the transistor?

1.  0.6 W

2.  2.4 W

3.  4.2 W

4.  5.4 W

4

2.4 W

Explanation :
No Explanation available for this question

# Consider the transformer connections in a part of a power system shown in the figure.The nature of transformer connections and phase shifts are indicated for all but one transformer Which of the following connections, and the corresponding phase shift θ, should be used for the transformer between A and B

1.  Star - Star (θ = 0°)

2.  Star - Delta (θ = -30°)

3.  Delta - Star (θ = 30°)

4.  Star - Zigzag (θ = 30°)

4

Star - Star (θ = 0°)

Explanation :
No Explanation available for this question

# The incremental cost curves in Rs/MW hr for two generators supplying a common load of 700 MW are shown in the figures. The maximum and minimum generation limits are also indicated. The optimum generation schedule is : GENERATOR-A GENERATOR-B

1.  Generator A : 400 MW, Generator B : 300 MW

2.  Generator A : 350 MW, Generator B : 350 MW

3.  Generator A : 450 MW, Generator B : 250 MW

4.  Generator A : 425 MW, Generator B : 275 MW

4

Generator A : 450 MW, Generator B : 250 MW

Explanation :
No Explanation available for this question

# Two regional systems, each having several synchronous generators and loads are interconnected by an ac line and a HVDC link as shown in the figure. Which of the following statements is true in the steady state:

1.  Both regions need not have the same frequency

2.  The total power flow between the regions (Pac + Pdc) can be changed by controlling the HVDC converters alone

3.  The power sharing between the ac line and the HVDC link can be changed by controlling the HVDC converters alone.

4.  The direction of power flow in the HVDC ling (Pdc) cannot be reversed.

4