Q.1
The generating voltage and frequency in India is about?
  • 11 kV and 60 Hz
  • 11 kV and 50 Hz
  • 220 kV and 60 Hz
  • 220 kV and 50 Hz
Q.2
The advantage of neutral earthing is
  • Freedom from persistent arcing grounds
  • Over voltages due to lightning can be discharged to earth
  • Simplified design earth fault protection
  • All of the above
Q.3
When a line-to-line fault occurs, the short circuit current of an alternator depends upon its
  • Sub transient reactance
  • Transient reactance
  • Synchronous reactance
  • Short circuit reactance
Q.4
Base impedance of the power system is given as:
  • (Base kV)2/Base MVA
  • (Base kV)/Base MVA
  • Base MVA/(Base kV)2
  • None of these
Q.5
If power factor is less than unity then it will result in
  • Large kVA rating of equipment
  • Greater conductor size
  • Large copper losses
  • All of the above
Q.6
Which of the following type of reactors are popularly used in power systems?
  • Compensation reactors
  • Current limiting reactors
  • Suppression or Peterson reactors
  • All of these
Q.7
While designing the distribution to locality of one lac population with medium dense load requirement, we can employ ___________
  • radial system
  • parallel system
  • ring main system
  • any of the mentioned
Q.8
Skin effect is proportional to
  • diameter of conductor
  • (diameter of conductor)1/2
  • (diameter of conductor )2
  • none
Q.9
What are the common assumptions made for the equal area criterion?
  • The transmission line and machine resistances are neglected
  • Rotor speed of the machine is constant
  • Mechanical input remains constant.
  • All of these
Q.10
In India largest thermal power station is located at
  • Kota
  • Sarni
  • Chandrapur
  • Neyveli
Q.11
. One would design the feeders of the transmission system based on its ____________
  • a) current capacity
  • b) voltage drop
  • c) operating voltage
  • d) all of the mentioned
Q.12
The amount of photo generated current increases slightly with increase in _________
  • Temperature
  • Photons
  • Diode current
  • Shunt current
Q.13
The load flow solution is always assured in case of:
  • Newton-Raphson method
  • Gauss method
  • Gauss-Seidel method
  • None of these methods guarantees
Q.14
In a star connected system without neutral grounding, zero sequence currents are
  • Zero
  • Phaser sum of phase currents
  • Same as r.m.s. value of phase currents
  • Same as peak value of phase currents
Q.15
When alternating current passes through a conductor
  • it remains uniformly distributed throughout the section of conductor
  • portion of conductor near the surface carries more current as compared to the core
  • portion of conductor near the surface carries less current as compared to the core
  • entire current passes through the core of the conductor.
Q.16
Wind energy is harnessed as ______ energy with the help of windmill or turbine.
  • Mechanical
  • Solar
  • Electrical
  • Heat
Q.17
A’ is an operator used to symmetrical component analysis
  • Which rotates the vector, it operates upon, through an angle 90° in the clockwise direction
  • Which rotates the vector, it operates upon, through an angle 120°, in the counter-clockwise direction
  • Which rotates the vector, it operates upon, through an angle 120°, in the clockwise direction
  • Which rotates the vector, it operates upon, through an angle 240°, in the clockwise direction
Q.18
By using which component can the transient stability limit of a power system be improved?
  • Series resistance
  • Series capacitor
  • Series inductor
  • a. Shunt resistance
Q.19
For the given distribution system the maximum voltage at the midpoint will be ________
  • 155.6 V
  • 311.12 V
  • 622 V
  • 220 V
Q.20
In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than
  • 200 km
  • 160 km
  • 100 km
  • 80 km.
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