HVAC Electrical Basics Practice Test Questions with Correct Solutions, A+

Magnetic lines of force flow between _______ of a magnet - North Pole and South Pole Resistance is measured in which of the following: - Ohms In a three phase supply system, each phase is _______ with each other: - 120 degrees Power factor in a normal electrical circuit be ______: - Lagging In a series current which of the following quantity remains same: - Current Capacitors used in motors will be rated in _______: - Microfarads A 4 pole motor runs at ______ rpm: - 3600 In which of the following energy is stored in the form of magnetic filed: - Inductor Rate of change of charge is defined as: - Current The starting winding of an AC single phase motor is _______ out of phase with the run winding: - 45 degrees The Locked Rotor Current (LRC) of a single phase motor is about _______ of full load current of the motor: - 5 to 7 times Fuse is used in a circuit for which of the following protection: - Short Circuit Protection The current carrying capacity of a wire depends on the: - Size of conductor cross section All electrical installations must meet the _______: - NEC Wattmeter is used to measure which of the following: - Power Capacitor motor has which of the following: - high starting current, high starting torque In a dc circuit, capacitor acts as ______: - Open Circuit When a conductor is cut by magnetic flux lines emf is produced: - True Which of the following factors affect the Insulation Resistance Measurement value: - All the options are correct (Temperature,Humidity,Duration of the measurement) Solenoid valves are ________ operated: - Electrically In a 60 Hz ac circuit current wave, current value reaches to zero ______ times in a second - 120 In a purely capacitive circuit, power factor of the circuit will be _______ - Leading In a series circuit, ______ remains same through out the circuit: - Current Frequency in a dc circuit will be ______: - 0 Hz In a parallel circuit , which of the quantity remains same: - Voltage Power factor in a resistive circuit will be _______ : - Resistive Ground wire that connects frame of an electrical load and earth has a color code _______: - Green 1 watt power = _______ Btu - 3.412 Which of the following has negative charge: - Electron Impedance in AC Circuit constitutes which of the following: - All the options are correct (Inductive Reactance,Capacitive Reactance,Resistance) A 4 pole machine operates at a speed of about: - 1600 rpm Ohms law is applicable to which of the following circuits: - Resistive An Induction motor always runs _______ the synchronous speed: - Below A centrifugal switch is used to take out the starting winding out of the circuit once the motor reaches ____ of its rated speed: - 75% Which of the following is a self starting motor: - 3-phase induction motor Most of the ac voltmeter and ammeters are calibrated to