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Esco Electrical Test Questions & 100% Verified
Answers | Latest Update | Already Graded A+
What is current flow? ๐ธ๐ธ๐ธ : D.The flow of electrons in a circuit What is impedance? ๐ธ๐ธ๐ธ : A.Opposition to alternating current Like charges will ๐ธ๐ธ๐ธ : B.Repel each other Any material that will readily release electrons is called: ๐ธ๐ธ๐ธ : B.A conductor The symbol for current is: ๐ธ๐ธ๐ธ : B. I Electricity can produce: ๐ธ๐ธ๐ธ : D. All the above light
heat magnetism The safety ground conductor is usually colored: ๐ธ๐ธ๐ธ : B.Green An electron has: ๐ธ๐ธ๐ธ : B.A negative charge Which of the following materials would be best suited for use as a semi-conductor? ๐ธ๐ธ๐ธ : D.Silicon Which of the following meters must use internal power to check a load or circuit? ๐ธ๐ธ๐ธ : A.Ohmmeter What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm control relay? ๐ธ๐ธ๐ธ : B.Only the control relay would operate Three defrost heaters, each 15 ohms, are wired in parallel to a 120 volt power supply. How many Watts are consumed? ๐ธ๐ธ๐ธ : C. 2880
๐ธ๐ธ๐ธ : D .Both B and C What is the term used to describe the output side of a transformer? ๐ธ๐ธ๐ธ : D .Secondary side One horsepower is equal to ______ watts. ๐ธ๐ธ๐ธ : B. 746 A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? ๐ธ๐ธ๐ธ : A. 6 ohms In a series circuit, the voltage drop across each load will: ๐ธ๐ธ๐ธ : D .Add up to equal the source voltage Which of the following is equal to 2.1kW? ๐ธ๐ธ๐ธ : c. 2100 watts A capacitor analyzer is designed to check: ๐ธ๐ธ๐ธ : D .The capacitance of the a capacitor On an electronic oil safety switch, what changes the pressure signal to an electrical signal?
๐ธ๐ธ๐ธ : A.Transducer A three phase load requires a minimum of ๐ธ๐ธ๐ธ : A.Three supply lines An electronically commutated motor (ECM) is designed to: ๐ธ๐ธ๐ธ : D .Provide proper airflow under various conditions Resistance can be calculated by: ๐ธ๐ธ๐ธ : A.E divided by I The total resistance in a parallel circuit will be: ๐ธ๐ธ๐ธ : D .Less than the smallest resistance Which of the following statements about current is true? ๐ธ๐ธ๐ธ : B.Current flow will increase when voltage increases When resistors are wired parallel: ๐ธ๐ธ๐ธ : B.The voltage drop across each resistor will be the same as the applied source voltage Which of the following is equal to 100 milliamps?
๐ธ๐ธ๐ธ : C.IxR An ohmmeter should never be connected to a: ๐ธ๐ธ๐ธ : D. Charged capacitor until it has been discharged Which of the following would be considered an inductive load? ๐ธ๐ธ๐ธ : D. Electric motor The voltage to ground of a high leg or "stinger leg" on a three phase open delta system will be approximately: ๐ธ๐ธ๐ธ : C. 208 Which of the following is the symbol for impedance? ๐ธ๐ธ๐ธ : D. Z What amperage measurement would you expect if you clamped your meter around both wires in a two wire circuit? ๐ธ๐ธ๐ธ : A. 0 due to the cancellation of the two magnetic fields A diode is used to? ๐ธ๐ธ๐ธ : A. Control the direction of electron flow
Three resistors are wired parallel. Two have a value of 12 ohms, one of 6. What is the total resistance? ๐ธ๐ธ๐ธ : C. 3 A transformer has 1000 turns on the primary side and 500 on the secondary. What is the output if the input is 120v? ๐ธ๐ธ๐ธ : C. 60 v A transformer has 1000 turns on the primary side and 2000 on the secondary. What is the output if the input is 120v? ๐ธ๐ธ๐ธ : D. 240 v If the conductor in an AC circuit is wound into a coil, the resulting EMF opposes supply voltage. This is called: ๐ธ๐ธ๐ธ : B. Inductive reactance To change rotation on a 3-phase motor: ๐ธ๐ธ๐ธ : C. Change position of any two wires A solenoid valve operates on the principle of: ๐ธ๐ธ๐ธ : C. Electromagnetism
Utility companies usually provide residential homes with: ๐ธ๐ธ๐ธ : B. 240 v, single phase, three wire Transformers are rated by: ๐ธ๐ธ๐ธ : B. VA at the secondary Circuit breakers and fuses are used to provide: ๐ธ๐ธ๐ธ : C. Protection from an overload of current Excessive current can be caused by: ๐ธ๐ธ๐ธ : D. Short circuit A device with overload protection used to control a motor is a: ๐ธ๐ธ๐ธ : D. Line starter What is the minimum number of wires required between two start/stop push button controls? ๐ธ๐ธ๐ธ : B. 1 If contacts become badly pitted, it is acceptable to: ๐ธ๐ธ๐ธ : B. Replace the contacts or control
The thermal overload contacts on a line starter are usually ___ reset. ๐ธ๐ธ๐ธ : A.Manual Which of the following motors is most energy efficient? ๐ธ๐ธ๐ธ : B. ECM Contactors are rated according to the maximum amperage through the: ๐ธ๐ธ๐ธ : B. Contacts The ____ drawing illustrates where the components are located on the appliance. ๐ธ๐ธ๐ธ : A.Pictorial On a good single phase compressor, which winding terminals have the highest resistance? ๐ธ๐ธ๐ธ : A.Run to start When testing a motor with an ohmmeter, the following measurements are recorded; C to R = 4, C to S = 6.2, R to S = 10.2, R to ground = 20.4. This indicates: ๐ธ๐ธ๐ธ : B. A grounded condition With a motor running at full load, voltmeter leads are placed on L1 and T1 with no measurable voltage detected. This indicates:
๐ธ๐ธ๐ธ : D. 37.5MFD, 440 VAC
When checking the windings on a three phase motor, the resistance readings should: ๐ธ๐ธ๐ธ : C. All read the same Capacitors are always connected _____ with the start winding? ๐ธ๐ธ๐ธ : A. In series The symbol for a heating thermostat is represented by: ๐ธ๐ธ๐ธ : C. The symbol for a pressure switch that closes on a rise of pressure is represented by: ๐ธ๐ธ๐ธ : B. The symbol for a pressure switch that opens on a rise in pressure is represented by: ๐ธ๐ธ๐ธ : D. The synchronous speed of a four pole, 60 Hz single phase motor is: ๐ธ๐ธ๐ธ : D. 1800 RPM The symbol for a transformer is: ๐ธ๐ธ๐ธ : C.
The symbol for a thermal overload is: ๐ธ๐ธ๐ธ : D. The symbol for a pressure switch is ๐ธ๐ธ๐ธ : A. The symbol for a thermostatic switch is: ๐ธ๐ธ๐ธ : B. IN the schematic, what voltage would be found across l1 to l2? ๐ธ๐ธ๐ธ : A. 240 volts IN the schematic,(during operation ) what voltage would be found across the condenser fan motor? ๐ธ๐ธ๐ธ : A. 240 volts IN the schematic,(during operation ) what voltage would be found across the transformer primary ๐ธ๐ธ๐ธ : B. 240 volts In the schematic, what voltage would be found from termianl G to the load side of the transformer?
๐ธ๐ธ๐ธ : C. a faulty thermostat- auto / fan on switch In the schematic, the crankcase heater will operate; ๐ธ๐ธ๐ธ : C. when the compressor is off IN the schematic,, the coil on line # 11 does not control; ๐ธ๐ธ๐ธ : D. the blower motor
