Technician A says that a defective spark plug wire can cause an engine misfire. Technician B says that a defective spark plug can cause an engine misfire. Which technician is correct?
A) Technician A only B) Technician B only
C) Both technicians D) Neither technician
C
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Which of these uses a movable core to act as an electric switch?
A) Solenoid B) Transistor C) Relay D) None of these
The ideal ON resistance of a relay is
A) 10 ?. B) 1 M?. C) 0 ?. D) infinite ?.
The article “Vehicle-Arrival Characteristics at Urban Uncontrolled Intersections” presents data on traffic characteristics at 10 intersections in Madras, India. One characteristic measured was the speeds of the vehicles traveling through the intersections. The accompanying table gives the 15th, 50th, and 85th percentiles of speed (in km/h) for two intersections.
a. If a histogram for speeds of vehicles through intersection A were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.
b. If a histogram for speeds of vehicles through intersection B were drawn, do you think it would be skewed to the left, skewed to the right, or approximately symmetric? Explain.
If an electric heater requires 23 A at 110 V, determine
a. The power it dissipates as heat or other losses. b. The energy dissipated by the heater in a 24-h period. c. The cost of the energy if the power company charges at the rate 6 cents/kWh. Assumptions: The heater works for 24 hours continuously.