Stationary Engineer Electric 2023 (correctly answered)

1. An AC circuit consists only of a pure inductance and a power source. The relationship between the voltage and the current in this circuit is that the: current lags the voltage 2. The power factor of a load is equal to the power divided by the power.: True ; apparent 3. A 10-ohms and 20-ohms resistor are connected in parallel. The total line current drawn by this parallel combination is 30 amps. Under these condi- tions, the line voltage will be volts.: 200 4. A 20-ohm resistor is connected in series with a parallel combination of two resistors, one of which is 10-ohms, the other 40-ohms. If the voltage across the parallel combination is 40 volts, the voltage across the 20-ohm series resistor is volts.: 100 5. A certain 120-volts single-phase AC circuit has a power factor of 80 percent and a watt-meter reading of 1150 watts. The current drawn by the circuit is amperes.: 12 6. If the voltage between lines of a 3-phase, 3-wire delta connected system is 2400 volts, then the phase voltage is volts: 2400 7. A circuit consists of an inductive reactance of 15 ohms and a resistor of 20 ohms in series across a 100-volts, 60 cycles AC supply. The current in this circuit is amperes.: 4 8. A 3 phase, 3 wire, 208 volt, 60 cycles AC service supplies a balanced load consisting of three 30 ohms resistors connected wye. The line current under these conditions os MOST NEARLY amperes.: 6.9 9. If the level of the electrolyte in a lead acid storage battery falls below the top of the plates because of evaporations under normal operating condi- tions, it is BEST to add: Water 10. A 600 volt cartridge fuse must have knife blade contacts if its current rating exceeds amperes.: 60 11. When the magnitude of the short circuit currents in a feeder circuit must be limited, this is USUALLY accomplished by means of: reactors 12. The cross sectional area in circular mils of a standard cable having 37 strands, each of which ha a diameter of 90 nils, is MOST NEARLY: 300,000 13. A coil having an average diameter of 4 inches is to be made up from a 1,260 ft long length of wire. The numbers of turns in this coil will be MOST NEARLY: 1,200 14. The device commonly known as a growler is FREQUENTLY used to: test DC armature windings for shorts 15. When a megger is applied alternately to the two leads of a direct current electrolytic capacitor, the reading will: start at zero but increase gradually for one of the connections 16. The device used to convert direct current to alternating current is called- : inverters 17. Of the following conditions, the one which is MOST likely to cause flash- ing or excessive arcing from brush to brush in a motor is: Excessively high voltage on the line 18. The currents in the armature equalizer connections in a DC generator are: alternating currents 19. A generating station has one 1000 Kw and two 2000 Kw generators. To supply 2000 Kw MOST economically, the operating conditions should be: one 2000 Kw generator at full load 20. The terminal voltage of a DC shunt generator having an armature current of 100 amperes, an armature resistance of 0.02 ohms, and a generated E.M.F of 222 volts is MOST NEARLY volts.: 220 21. The number of poles in the field of an alternator generating voltage at a frequency of 60 cycles per second while rotating at 1200 rpm is: 6 22. If the field of a shunt motor opens while running, the motor will: run away 23. To reverse the direction of rotation of a cumulative compound motor, and not have it run as a differential compound motor, reverse the connections to the field.: shunt field and to the