A) always leading B) always lagging C) always zero D) always unity. Ans : (D)
A) inserting resistance in the line B) inserting a capacitor in series with the contacts C) inserting a capacitor in parallel with the contacts D) none of above. Ans : (C)
A) extinguish the arc B) transmit voltage by arcing C) ionize the surrounding air D) produce the arc Ans : (A)
A) mercury switch B) fuse C) contactor D) relay. Ans : (D)
A) 18 SWG TIN - 12.5 A B) 20 SWG TIN - 10 A C) 22 SWG TIN - 7.5 A D) 24 SWG TIN - 5 A. Ans : (D)
A) in phase wire arc current B) leading the arc current by 90o C) lagging the arc current by 90o D) none of above. Ans : (A)
A) Copper B) Gold C) Tungsten D) Silver. Ans : (C)
A) Tungsten B) Molybdenum C) Nickel alloy D) All of the above. Ans : (D)
A) High rupturing capacity fuses B) Holding and resisting current fuses C) Heat reflecting cool fuses D) High resistance and Capacitance fuses. Ans : (A)
A) Oil immersion of contacts B) Magnetic blow out of arc C) Use of rectifiers D) Deionization of arc path. Ans : (C)