1
GATE EE 2016 Set 1
Numerical
+2
-0
A 30 MVA, 3-phase, 50Hz, 13.8 kV, star-connected synchronous generator has positive, negative and zero sequence reactances, 15%, 15% and 5% respectively. A reactance (Xn) is connected between the neutral of the generator and ground. A double line to ground fault takes place involving phases ‘b’ and ‘c’, with a fault impedance of j0.1 p.u. The value of Xn (in p.u.) that will limit the positive sequence generator current to 4270 A is __________.
Your input ____
2
GATE EE 2016 Set 1
Numerical
+1
-0
The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu, respectively. Neglect all resistances in the system and consider the pre-fault system to be unloaded. The pre-fault voltage at all buses in the system is 1.0 pu. The voltage magnitude at bus B during a three-phase fault at bus A is 0.8 pu. The voltage magnitude at bus A during a three-phase fault at bus B in pu, is __________.
Your input ____
3
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in polar coordinates), two of the PV buses are converted to PQ type. In this iteration.
A
the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes increases by two.
B
the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes increases by two.
C
the number of unknown voltage angles increases by two and the number of unknown voltage magnitudes decreases by two.
D
the number of unknown voltage angles remains unchanged and the number of unknown voltage magnitudes decreases by two
4
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+2
-0.6
The output of a continuous-time, linear time-invariant system is denoted by T{x(t)} where x(t) is the input signal. A signal z(t) is called eigen-signal of the system T, when T{z(t)}= yz(t), where $$\gamma$$ is a complex number, in general, and is called an eigen value of T. suppose the impulse response of the system T is real and even. Which of the following statements is TRUE?
A
cos(t) is and eigen-signal but sin(t) is not
B
cos(t) is and sin(t) are both eigen-signal but with different eigen values
C
sin(t) is an eigen-signal but cos(t) is not
D
cos(t) and sin(t) are both eigen-signal with identical eigen values
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