A) Over-voltages B) Surges C) Transients D) All of the above. Ans : (D)
A) copper tungsten alloy B) electrolytic copper C) porcelain D) aluminium alloy. Ans : (A)
A) connecting a capacitance between line and earth B) connecting an inductor in series with the line C) either of (A) or (B) above D) connecting an inductor between line and earth and connecting a capacitor in series with the line. Ans : (C)
A) frequent arcing ground B) difficult earth fault relaying C) voltages oscillations D) all of the above. Ans : (D)
A) Direct-on-line B) Stator rotor starter C) Star-delta starter D) Auto-transformer. Ans : (A)
A) over current protection B) short-circuit protection C) open-circuit protection D) none of the above. Ans : (B)
A) reduce the steepness of wave-from B) reduce the voltage of wave-from C) reduce the current of wave-from D) modify the shape of wave-front. Ans : (A)
A) SF6 gas is yellow in colour B) SF6 gas has pungent smell C) SF6 gas is lighter than air D) SF6 gas is nontoxic. Ans : (D)
A) its low density B) its low cost C) its high resistivity D) its low melting point. Ans : (B)
A) over-current relay B) kit kat fuses C) cartridge fuses D) all of the above. Ans : (A)