As shown in the figure,a negative feedback system has an amplifier of gain 100 with ±10% tolerance in the forward path,and an attenuator of value 9/100 in the feedback path.The overall system gain is approximately

1.  10±1%

2.  10 ±2%

3.  10 ±5%

4.  10 ±10%

View Answer  
4
Correct Answer :

10±1\%


Explanation :
No Explanation available for this question

For the system 2/(s+1),the approximate time taken for a step response to reach 98% of its final value is

1.  1s

2.  2s

3.  4s

4.  8s

View Answer  
4
Correct Answer :

4s


Explanation :
No Explanation available for this question

If the electrical circuit of figure(b) is an equivalent of the coupled tank system of figure (a),then

1.  A, B are resistances and C, D capacitances

2.  A, C are resistances and B, D capacitances

3.  A, B are capacitances and C, D resistances

4.  A, C are capacitances and B, D resistances

View Answer  
4
Correct Answer :

A, C are capacitances and B, D resistances


Explanation :
No Explanation available for this question

A single-phase transformer has a turns ratio of 1:2, and is connected to a purely resistive load as shown in the figure.The magnetizing current drawn is 1A, and the secondary current is 1A. If core losses and leakage reactance's are neglected, the primary current is

1.  1.41A

2.  2A

3.  2.24 A

4.  3A

View Answer  
4
Correct Answer :

2.24 A


Explanation :
No Explanation available for this question

Power is transferred from system A to system B by an HVDC link as shown in the figure.If the voltages VAB and VCD are as indicated in the figure, nd I>0,then

1.  VAB

2.  VAB>0, VCD>0, VAB

3.  VAB>0, VCD>0, VAB>VCD

4.  VAB>0, VCD

View Answer  
4
Correct Answer :

VAB>0, VCD>0, VAB>VCD


Explanation :
No Explanation available for this question

A balanced three-phase voltage is applied to a star-connected induction motor, the phase to neutral voltage being V.The stator resistance, rotor resistance referred to the stator, stator leakage reactance,rotor leakage reactance referred to the stator,and the magnetizing  reactance are denoted  by rs, rr, xs, xr and Xm,respectively.The magnitude of the starting current of the motor is given by  

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Consider a step voltage wave of magnitude 1pu travelling along a lossless transmission line that terminates in a reactor. The voltage magnitude across the reactor at the instant the travelling wave reaches the reactor is

1.  -1pu

2.  1pu

3.  2pu

4.  3pu

View Answer  
4
Correct Answer :

-1pu


Explanation :
No Explanation available for this question

Consider two buses connected by an impedance of (0+j5)Ω.The bus 1 voltage is 100L30°V,and bus 2 voltage is 100L0°V.The real and reactive power supplied by bus 1, respectively,are

1.  1000W, 268VAr

2.  -1000W, -134Var

3.  276.9W, -56.7Var

4.  -276.9W, 56.7Var

View Answer  
4
Correct Answer :

1000W, 268VAr


Explanation :
No Explanation available for this question

A three-phase,33kV oil circuit breaker is rated 1200A,2000MVA,3s.The symmetrical breaking current is

1.  1200 A

2.  3600 A

3.  35 kA

4.  104.8 kA

View Answer  
4
Correct Answer :

35 kA


Explanation :
No Explanation available for this question

Consider a stator winding of an alternator with an internal high-resistance ground fault.The currents under the fault condition are as shown in the figure.The winding is protected using a differential current scheme with current transformers of ratio 400/5 A as shown.The current through the operating coil is

1.  0.17875A

2.   0.2A

3.  0.375A

4.  60 kA

View Answer  
4
Correct Answer :

0.375A


Explanation :
No Explanation available for this question
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