The roots of the closed loop characteristics equation of the system are  

1.  -1 and -15  

2.  6 and 10

3.  -4 and -15

4.  -6 and 10

View Answer  
4
Correct Answer :

-6 and 10


Explanation :
No Explanation available for this question

The following equation defines a separately excited dc motor in the form of a differential equation .The above equation may be organized in the state-space form as follows .Where the P matrix is given by

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The loop gain GH of a closed system is given by the following expression .The value of K for which the system just becomes unstable is

1.  K=6

2.  K=8

3.  K=48

4.  K=96

View Answer  
4
Correct Answer :

K=48


Explanation :
No Explanation available for this question

The asymptotic bode plot of the transfer function is given in the figure.The error in phase angle and dB gain at a frequency of ω=0.5 a are respectively.

1.  4.9o,0.97 dB

2.  5.7o,3 dB

3.  4.9o,3 dB

4.  5.7o,0.97 dB

View Answer  
4
Correct Answer :

4.9o,0.97 dB


Explanation :
No Explanation available for this question

The block diagram of a control system is shown in figure.The transfer function G(s)=Y(s)/U(s) of the system is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

A rectifier type ac voltmeter consists of a series resistance Rs,an ideal full wave rectifier bridge and a PMMC instrument as shown in figure.The interval resistance of the instrument is 100Ω and a full-scale deflection  is produced by an dc current  of 1 mA.The value of Rs required to obtain full scale deflection with an ac voltage of 100 V(rms)applied to the input terminals is

1.  63.56Ω

2.  89.93Ω

3.  89.39Ω

4.  141.3Ω

View Answer  
4
Correct Answer :

89.39Ω


Explanation :
No Explanation available for this question

A wattmeter reads 400 V when its current coil is connected in the Rphase and its pressure coil is connected between this phase and the neutral of a symmetrical 3-phase supplying a balanced star connected 0.8p.f  inductive load.The phase sequence is RYB.What will be the reading of this wattmeter if its pressure coil alone is reconnected between the B and Y phases all other connections remaining as before

1.  400.0

2.  519.6

3.  300.0

4.  692.8

View Answer  
4
Correct Answer :

692.8


Explanation :
No Explanation available for this question

The inductance of a certain moving-iron ammeter is expressed as L=10+30- .where  is the deflection in radians from the zero position.The control spring torque in 25×10-6 Nm/radian.The deflection of the pointer in radian.when the meter carries a current of 5A,is

1.  2.4

2.  2.0

3.  1.2

4.  1.0

View Answer  
4
Correct Answer :

1.2


Explanation :
No Explanation available for this question

A 500 A/5 A,50 Hz current transformer has a bar primary.The secondary burden is a pure resistance of 1Ω and it draws a current of 5 A.If the magnetic core requires 250 AT for magnetization,the percentage ratio error is

1.  10.56

2.  -10.56

3.  11.80

4.  -11.80

View Answer  
4
Correct Answer :

-10.56


Explanation :
No Explanation available for this question

The voltage flux adjustment of a certain 1-phase 220 V induction watt hour meter is altered so that the phase angle between the applied voltage and the flux due to its 85o The errors introduced in the reading of  this meter.when the current is 5A at power factors of unity and 0.5 lagging are respectively

1.  3.8 mW,77.4 mW

2.  -3.8 Mw,-77.4  mW

3.  -4.2 W,-85.1 W

4.  4.2 W,85.1 W

View Answer  
4
Correct Answer :

-4.2 W,-85.1 W


Explanation :
No Explanation available for this question
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