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Quiz 2
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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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