A) arc dispersion B) arc prevention C) deionization D) none of the above. Ans : (A)
A) high capacitance B) high inductance C) high resistance D) none of above. Ans : (B)
A) reducing current density B) providing arc shield C) providing parallel paths D) deionization. Ans : (D)
A) in the load circuit B) parallel to the axis of the arc C) at right angles to the axis of the arc D) none of above. Ans : (C)
A) it will be possible to interrupt any value of current without bringing contact closer to one another B) it will be possible to interrupt any value of current without arcing C) it will not be possible to pass the current D) it will not be possible to interrupt the circuit. Ans : (B)
A) silver B) tungsten C) graphite D) carbon. Ans : (A)
A) Thermal capacity B) Contact resistance C) Thermal conductivity D) All of the above. Ans : (B)
A) instantaneous duty B) permanent break C) repeated duty D) intermittent duty. Ans : (C)
A) in high MVA capacity circuits B) in mines C) substations D) on transmission lines of low voltage. Ans : (B)
A) same as opening time B) opening time + arc duration C) opening time + arc duration + resistor current duration. Ans : (C)