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1) On which among the following factors does the magnitude of the fault current depend? a. Total impedance upto the fault. b. Voltage at the fault point c. Both (a) and (b) d. None of these
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2) Which among the following reactance have a greater value? a. Sub transient reactance b. Transient reactance c. Synchronous reactance d. All of these e. None of these
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3) Which among the following methods are generally used for the calculation of symmetrical faults? a. Norton theorem b. Thevnin’s theorem c. Kirchhoff’s laws d. Only (b) and (c) e. All of these
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4) What is the multiplication factor to be multiplied with symmetrical momentary current to account for the presence of DC off set current? a. 1.2 b. 1.5 c. 1.6 d. 2.5
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5) What is the rated breaking capacity of the circuit breaker? a. The product of rated voltage and rated breaking current b. The product of rated voltage and rated symmetrical breaking current c. The product of fault voltage and breaking current d. None of these
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6) If the speed of the circuit breaker is 8 cycles or slower than that what will be the multiplying factor? a. 2.3 b. 1.0 c. 1.5 d. 1.7
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7) What will be the multiplying factor if the speed of the circuit breaker is 2 cycles? a. 2.2 b. 1.2 c. 2.8 d. 1.4
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8) What is the percentage of occurrence of symmetrical faults? a. 10 % b. 15 % c. 5 % d. None of these
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9) What does the positive sequence component consist of? a. Three balanced phasors of equal magnitude and displaced by 120° b. Three unbalanced phasors displaced by 120° c. Three phasors with equal magnitude and zero displacement. d. None of these
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10) What are zero sequence components? a. Three balanced phasors of equal magnitude and displaced by 120° b. Three balanced phasors displaced by 120° and having phase sequence opposite to that of the original phasors. c. Three phasors with equal magnitude and zero displacement. d. None of these
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