A THREE DAY NATIONAL LEVEL ONLINE QUIZ "SKYE -2020 "
DAY-2 (3rd July, 2020) on POWER SYSTEMS - Organised by Department of Electrical and Electronics Engineering,
N.B.K.R Institute of Science &Technology , (Autonomous), Vidyanagar, Nellore (Dt), A.P , Estd. 1979
Name of the participant
Name of the Institution/Organization
Name of the Department (In full form i.e ELECTRICAL AND ELECTRONICS ENGINEERING)
Address of the Institution/Organization
For the given circuit, Ybus and Zbus are bus admittance matrix and bus impedance matrix, respectively, each of size 2×2. Which one of the following statements is true?
Both Ybus and Zbus are unsymmetric
Ybus is unsymmetric and Zbus is symmetric
Both Ybus and Zbus are symmetric
Ybus is symmetric and Zbus is unsymmetric
100% string efficiency means
self-capacitance is maximum
shunt capacitance is maximum
shunt capacitance is zero
self-capacitance is zero
A 75 MVA, 10 kV synchronous generator has Xd =0.4 p.u. The Xd value (in p.u.) is a base of 100 MVA, 11 kV is
For a fault at the terminals of a synchronous generator, the fault current is maximum for a
line-to ground fault
3-phase to ground fault
A negative sequence relay is commonly used to protect
A bus bar
A transmission line
In an inverse definite minimum time, electromagnetic type over-current relay, the minimum time feature is achieved because of
Appropriate time delay element.
Saturation of the magnetic circuit
Proper mechanical design
In case of transmission line conductors, with the decrease in atmospheric temperature
length increases but stress Decreases
length increases and stress also increases
length decreases but stress increases
Both length as well as stress decreases
In a 3-step distance protection, the reach of the three zones of the relay at the beginning of the first line typically extends upto
80% of the first line, 50% of the second line and 20% of the third line.
50% of first line, 50% of second line and 20% of the third line.
80% of the first line, 20% of the second line and 10% of the third line.
100% of the first line, 50% of the second line and 20% of the third line.
The maximum demand of a consumer is 2 KW and the corresponding daily energy consumption is 30 units. What is the corresponding load factor
A large hydropower station has a head of 324 m and an average flow of 1370 m3/s. The reservoir is composed of a series of lakes covering an area of 6400 km2. The available hydraulic power is
Referring to daily load curve in Fig., the average load is
For a fixed value of complex power flow in a transmission line having a sending end voltage V, the real power loss will be proportional to
A load draws a power of 10 kW at a p.f. of 0.707 lagging. If power factor is to be improved to 1, then p.f. correction equipment should supply leading kVAR equal to
For the transmission line, if booster transformers are to be used, preferred location will be
at the receiving end
at the sending end
at the intermediate point
any where in the line
By increasing the transmission voltage to three times of its original value, the same power can be dispatched keeping the line loss
One-third of original value
Nine times of original value
One-ninth of original value.
Equal to original value
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