Electrical Engineering Questions with Answers

Electrical Engineering Questions with Answers

Questions

 - A  generating  station  has  a  maximum demand of 30 MW, a load factor of 60% and a  plant  capacity  factor  of  50%.  The  reserve capacity of the plant is

- A 100 km long transmission line is loaded at 110 kV. If the loss of the line is 15 MW and the  load  is  150  MVA,  the  resistance  of  the line is

(a) 8.06 ohms per phase

(b) 0.806 ohms per phase

(c) 0.0806 ohms per phase

(d) 80.6 ohms per phase

- When  the  load  on  a  transmission  line  is equal to the surge impedance loading

(a)  The  receiving  end  voltage  is  less  than the sending end voltage

(b)  The  sending  end  voltage  is less than  the receiving end voltage

(c)  The  receiving  end  voltage  is  more  than the sending end voltage

(d)  The  receiving  end  voltage  equal  to  the sending end voltage

- HVDC transmission is preferred to EHV AC because

(a)  HVDC  terminal  equipments  are inexpective

(b)  VAR  compensation  is  not  required  in HVDC systems

(c)  System stability can be improved

(d)  Harmonic problem is avoided

- Zero-sequence  current  is  used  for  relaying purpose only in the case of

(a) Phase over current relay

(b) Phase impedance relay

(c) Ground over current relay

(d) Ground impedance relay

- In  order  to  quench  the  are  quickly  and  also optimize the dimensions generally

(a) Air blast C.B. is preferred

(b) Oil C.B. is preferred

(c) SF6 C.B. is preferred

(d) Minimum oil C.B. is preferred

- The  corona  loss  in  a  50  Hz  system  is  0.25 kW/ph/km.  At  a  frequency  of  60  Hz,  the corona loss would be

(a) 0.30 kW/ph/km  (b) 0.36 kW/ph/km

(c) 028 kW/ph/km  (d) 0.21 kW/ph/km

- The critical point lies within the nyquist plot then the system is

(a) Marginally stable

(b) Unstable

(c) Stable

(d) Undetermined

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