Which of the following is the least expensive protection for overcurrent is low voltage system ?

A. split-phase relays
B. reactance relays
C. impedance relays
D. none of the above

A. overload
B. short-circuit and overload
C. open circuit, short-circuit and overload
D. none of the above

A. resistance, reactance or impedance
B. voltage and current
C. light intensity
D. temperature
E. all above

A. single phase motors only
B. two phase motors only
C. two single phase motors running in parallel
D. three phase motors

A. current carrying contacts called electrodes
B. arc extinguishers
C. circuits to break the system
D. transformers to isolate the two systems
E. any of the above

A. Zero
B. Unity
C. Infinity
D. None of the above