Diesel fuel may be blended to improve:
A. Fuel economy
B. Cold starting
C. Emissions levels
D. Diesel fuel is not blended
Answer: B
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A storage battery must supply at least what percentage of the system voltage for the total load of circuits supplying legally required standby power?
a. 33-1/3% b. 50% c. 87-1/2% d. 100%
Answer the following statement(s) true (T) or false (F)
1. The wound-rotor induction motor and the squirrel-cage induction motor both were developed for variable speed applications. 2. To minimize the starting surge of current to a wound-rotor induction motor, insert the full resistance of the speed controller in the rotor circuit. 3. If the full resistance of the speed controller is inserted into the rotor circuit when the motor is running, the rotor current decreases and the motor slows down. 4. As resistance is removed from the rotor circuit, the rotor speed will continue to increase until its speed matches the synchronous speed of the field developed by the stator windings. 5. The starting torque output of a wound-rotor induction motor is poor when all resistance is removed from the rotor circuit.
Technician A says that a vehicle’s paint provides corrosion protection. Technician B says a sealer acts as a barrier coat between the repair below and the coating above. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B
Ten kg of copper (use Cp,cu = 0.39 kJ/kg·K) at 200°C are submerged in 50 kg of water at 10°C in an insulated container. After a long time, the temperature will be nearest:
A) 35.5°C B) 28.5°C C) 20.5°C D) 13.5°C