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ESCO ELECTRICAL TEST 2025-2026|ACTUAL
100Qs&As|ALREADY GRADED A+|100%
VERIFIED|NEW UPDATE SUMMER-FALL 2025
A ___ is commonly used on a single phase fractional horse power compressor to disconnect the start winding. D. Current relay The rotation of a single phase motor is determined by: A.The direction of current through the start winding Single phase motor speed is determined by: B. Number of stator poles Capacitor-start, capacitor-run motors provide: B. Medium running and high starting torque Direct digital control (DDC) is:
D. Electronic controls used for equipment control and monitoring What connects the T1, T2 and T3 terminals on a contactor? B. Load wires A step-up transformer increases B. voltage Utility companies usually provide residential homes with: B. 240v, single phase, three wire Transformers are rated by: B. VA at the secondary Circuit breakers and fuses are used to provide: C. Protection from an overload of current
Contactors are rated according to the maximum amperage through the: B. Contacts The ____ drawing illustrates where the components are located on the appliance. A.Pictorial On a good single phase compressor, which winding terminals have the highest resistance? 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: 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: C. Good, clean contacts
When the temperature of a negative temperature coefficient (NTC) thermistor increases, its resistance: B. Decreases When the temperature of a positive temperature coefficient (PTC) thermistor increases, its resistance: A.Increases The most common type of transducer used with HVAC/R equipment creates a signal based on: D. Pressure A thermocouple can: C. Generate a small DC current To discharge a capacitor: B. Use a 15,000 to 20,000 ohm, 2 to 5 watt resistor across the terminals
D.
The synchronous speed of a four pole, 60 Hz single phase motor is: D. 1800 RPM The symbol for a transformer is: C. The symbol for a thermal overload is: D. The symbol for a pressure switch is A. The symbol for a thermostatic switch is: B.
IN the schematic, what voltage would be found across l1 to l2? A. 240 volts IN the schematic,(during operation ) what voltage would be found across the condenser fan motor? A. 240 volts IN the schematic,(during operation ) what voltage would be found across the transformer primary B. 240 volts In the schematic, what voltage would be found from termianl G to the load side of the transformer? (Assume the thermostat is in the closed position and the fan is set to auto.) B. 24 volts In the schematic, what voltage would be found (during operation) acros the contacts when energized in line #8? (Assume the thermostat is in the closed position and the fan is set to auto.) B. 0 volts
IN the schematic,, the coil on line # 11 does not control; D. the blower motor What is current flow? D.The flow of electrons in a circuit What is impedance? A.Opposition to alternating current Like charges will B.Repel each other Any material that will readily release electrons is called: B.A conductor The symbol for current is: B. I
Electricity can produce: D. All the above light heat magnetism The safety ground conductor is usually colored: B.Green An electron has: B.A negative charge Which of the following materials would be best suited for use as a semi- conductor? D.Silicon Which of the following meters must use internal power to check a load or circuit? A.Ohmmeter
In electrical wiring, a black colored wire indicates: A. A hot conductor How many watts are used by a heater operating on 460 volts and drawing 5 amps? D. How are fuses sized? D .Both A and B What is generally considered the maximum allowable supply voltage variation A.5% Capacitors are rated in: D .Both B and C What is the term used to describe the output side of a transformer? D .Secondary side
One horsepower is equal to ______ watts. B. 746 A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? A.6 ohms In a series circuit, the voltage drop across each load will: D .Add up to equal the source voltage Which of the following is equal to 2.1kW? c .2100 watts A capacitor analyzer is designed to check: D .The capacitance of the a capacitor
When resistors are wired parallel: 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? C. 0.10 amps The meter on a house measures the ____ passing through it. C. Watts What is the correct formula for determining wattage? A.W = E x I A parallel circuit consists of three resistors; R1 = 30 ohms, R2 = 15 ohms, R3 = 10 ohms. If the current through R2 = 4 amps, what is the source voltage? B.60 volts Three 300 ohm resistors are wired parallel. What is the total resistance?
A.100 ohms Amps can be calculated by: A. E/R B.W/E C.The square root of W/R answer: D. all the above Voltage can be calculated by: C.IxR An ohmmeter should never be connected to a: D. Charged capacitor until it has been discharged Which of the following would be considered an inductive load? D. Electric motor The voltage to ground of a high leg or "stinger leg" on a three phase open delta system will be approximately:
A transformer has 1000 turns on the primary side and 2000 on the secondary. What is the output if the input is 120v? D. 240v If the conductor in an AC circuit is wound into a coil, the resulting EMF opposes supply voltage. This is called: B. Inductive reactance To change rotation on a 3-phase motor: C. Change position of any two wires A solenoid valve operates on the principle of: C. Electromagnetism
