NATE CORE EXAMINATIONS WITH A GRADED SOLUTIONS (100% GUARANTEED PASS)

NATE CORE EXAMINATIONS WITH A GRADED SOLUTIONS (100% GUARANTEED PASS) Sling psychrometers. - Answer-21. Because they are very accurate, liquid filled thermometers are often used in? a. Electronic wall thermostats. b. Infrared thermometers. c. Superheat and sub cooling measuring equipment. d. Sling psychrometers. a. E=I/R b. R=E/1 c. Pitting, dirt or a dead bug. - Answer-What would cause a reading of 6 volts AC across the closed contacts of a relay in an ener- gized circuit? a. Counter emf. b. A low voltage condition. c. Pitting, dirt or a dead bug. d. This is a normal feedback voltage reading. Always the same. - Answer-The overload protections of the "1OA" and "mA" inputs of a digital multimeter typically used in HVAC works are? a. Sometimes the same. b. Always the same. c. Never the same. d. Rarely the same. At zero or a specific resistance. - Answer-As a general rule, a continuity check using an ohmmeter shows continuity by reading?a. At zero or a specific resistance. b. Greater than 1 M ohm c. At or very near an infinite number of ohms. d. Of O volts. By connecting the voltmeter in parallel with the voltage to be measured. - Answer-How is a voltmeter connected for taking voltage readings? a. By connecting the voltmeter in parallel with the voltage to be measured. b. By connecting the voltmeter in series with the voltage to be measured. c. By always connecting the voltmeter with one lead at one side of the voltage and the other lead at ground. d. By always connecting the voltmeter with an external shunt across the voltage to be read. Reading type and range of values for all volts, amps and ohms. - Answer-A digital electric multimeter marked for "auto ranging" will automatically set itself for? a. Reading ohms and range when connected to a resistive load. b. Reading voltage and range when connected to a voltage source. c. Range of approximate value when set for either volts, amps or ohms. d. Reading type and range of values for all volts, amps and ohms. Broken light lines. - Answer-Field wired 120V and 240V wiring is typically shown on a wiring diagram as? a. Broken heavy lines. b. Solid heavy lines. c. Broken light lines. d. Solid light lines. 240/460V three phase - Answer-Motors above five horsepower that are used with belt driven fans are typically? a. 120V single phase b. 120V three phase c. 240/460V single phase d. 240/460V three phase Color coding is almost always used for low voltage wiring. - Answer-In most field wiring diagrams, the color cod- ing of wiring remains consistent. Which of the following is applicable? a. Color coding is rarely used for any wiring. b. Color coding is always used for all wires. c. Color coding is rarely used for low voltage wiring. d.. Color coding is almost always used for low voltage wiring. Troubleshooting a unit. - Answer-A ladder schematic is useful for? a. Finding where components are located inside a unit. b. Quickly determining all field wiring. c. Troubleshooting a unit. d. Quickly visualizing each component in a unit In their approximate positions in the equipment. - Answer-Pictorial wiring diagrams generally show components: a. In their approximate positions in the equipment. b. Grouped together by component type. c. Grouped with no pattern that is useful. d. Using IEEE symbols. Reverse the connections of any two motor leads. - Answer-To change the direction of rotation of a fan driven by a three phase induction motor, it is necessary to: a. Turn the motor around. b. Reverse the connections of any two motor leads. c. Reverse the brush leads. d. Turn the fan around. Each leg of line voltage only. - Answer-Which of the following is typically represented by the two lines on the sides of a ladder diagram? a. Ground and hot leg. b. Each leg of control voltage only. c. Each leg of line voltage only. d. Each leg of line or low voltage power. a. 2 pole - Answer-Which of the following motors will produce the greater speed (RPM). a. 2 pole b. 4 pole c. 6 pole d. 8 pole a. double. - Answer-If you double the RPM of a motor, then the CFM will a. double. b. halve c. square d. cube square - Answer-If you double the RPM of a motor, then the static pressure will a. double. b. halve c. square d. cube cube - Answer-If you double the RPM of a motor, then the horse power requirement will a. double. b. halve c. square d. cube The external static pressure of the system. - Answer-What determines the actual operating RPM of a PSC blower motor? a. The speed tap connections. b. The system switch on the thermostat. c. The external static pressure of the system. d. The room or space demand. Amp draw decreases - Answer-What happens to the amp draw of a PSC motor as the external static pressure increases? a. Amp draw increases b. Amp draw decreases c. Amp draw remains the same d. This should never be done as it will irreparable damage to the motor.