1
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
A lossless single machine infinite bus power system is shown below: GATE EE 2008 Power System Analysis - Power System Stability Question 18 English

The synchronous generator transfers $$1.0$$ per unit of power to the infinite bus. The critical clearing time of circuit breaker is $$0.28$$ s. If another identical synchronous generator is connected in parallel to the existing generator and each generator is scheduled to supply $$0.5$$ per unit of power, then the critical clearing time of the circuit breaker will

A
Reduce to $$0.14$$ s
B
Reduce but will be more than $$0.14$$ s
C
Remain constant at $$0.28$$ s
D
Increase beyond $$0.28$$ s
2
GATE EE 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider a synchronous generator connected to an infinite bus by two identical parallel transmission lines. The transient reactance $$x'$$ of the generator $$0.1$$ pu. Due to some previous disturbance, the rotor angle $$(d)$$ is undergoing an undamped oscillation, with the maximum value of $$\delta \left( t \right)$$ equal to $$\,{130^ \circ }\,.$$ One of the parallel lines trip due to relay mal-operation at an instant $$\,\,\,\,\,$$ when $$\,\delta \left( t \right)\,\, = {130^ \circ }\,\,$$ as shown in the figure. The maximum value of the per unit line reactance $$x,$$ such that the system does not lose synchronism subsequent to this tripping is GATE EE 2007 Power System Analysis - Power System Stability Question 19 English
A
0.87
B
0.74
C
0.67
D
0.54
3
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A generator feeds power to an infinite bus through a double circuit transmission line. A $$3$$ phase fault occurs at the middle point of one of the lines. The infinite bus voltage is $$1$$ pu, the transient internal voltage of the generator is $$1.1$$ pu and the equivalent transfer admittance during fault is $$0.8$$ pu. The 100 MVA generator has an inertia constant of $$5$$ MJ/MVA and it was delivering $$1.0$$ pu power prior of the fault with rotor power angle of $${30^ \circ }\,\,$$. The system frequency is 50Hz.

If the initial accelerating power is $$X$$ pu, the initial acceleration in elect deg/sec2, and the inertia constant in MJ-sec/elect deg respectively will be

A
$$31.4$$$$X,$$ $$18$$
B
$$1800$$ $$X,$$ $$0.056$$
C
$$X/1800,$$ $$0.056$$
D
$$X/31.4,$$ $$18$$
4
GATE EE 2006
MCQ (Single Correct Answer)
+2
-0.6
A generator feeds power to an infinite bus through a double circuit transmission line. A 3 phase fault occurs at the middle point of one of the lines. The infinite bus voltage is 1 pu, the transient internal voltage of the generator is 1.1 pu and the equivalent transfer admittance during fault is 0.8 pu. The 100 MVA generator has an inertia constant of $$5$$ MJ/MVA and it was delivering 1.0 pu power prior of the fault with rotor power angle of $${30^ \circ }\,\,$$. The system frequency is 50Hz.

The initial accelerating power (in pu) will be

A
1.0
B
0.6
C
0.56
D
0.4
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