A. is yellow in colour
B. is lighter than air
C. is nontoxic
D. has pungent small
E. none of the above
A. maintain the arc
B. extinguish the arc
C. transmit large power
D. emit the ionizing electrons
A. interception
B. interception and conduction
C. interception, conduction and dissipation
D. interception, conduction, dissipation and reflection
E. none of the above
A. low melting point and high specific resistance
B. low melting point and -low specific resistance
C. high melting point and low specific resistance
D. low melting point and any specific resistance
A. connecting lines in parallel
B. connecting lines in series
E. using machines of high impedance
D. reducing the excitation of machines
E. none of the above
A. motors
B. power outlet circuits
C. fluorescent lamps
D. light circuits
A. Inverse time trip
B. Time-delay trip
C. Shunt trip
D. None of the above
E. All of the above