Constant voltage - Study guides, Class notes & Summaries

How DC motors operate? Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force do not cross. Armature: (Definition) The rotating windings of a DC motor. The ____ is a movable electromagnet located between the poles of another fixed permanent (field) magnet as shown. Armature A twisting force called ______ must be developed. _____ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the magnet and armatu...

In capacitors, what is the purpose of the dielectric? - Prevent arcing within the capacitor Which of the following is true about capacitors in AC circuits? - Current leads voltage all the time What describes a capacitor s ability to store an electrical charge? - Capacitance which of the following statements is correct about polarized electrolytic capacitors? - Voltage polarity must be correct What is the time constant for a circuit with 150k ohms and 2 microfarad capacitor? - .3 seco...

Zener current will decrease - ANSWER-Refer to figure 1. If the load resistance R2 is reduced by half what happens what happens to zener diode? 4v - ANSWER-Refer to figure 1. The zener diode is designed to breakdown at 6VDC what is the voltage drop across R1 with a constant DC supply of 10VDC 30 rpm - ANSWER-An elevators motor rotates at 1200 rpm at contract speed and is geard at a ratio of 40:1. If the motor turns 40 rpm the sheave turns 1 rpm. What is the actual speed of the drive sheave ...

A Calibration procedure calls for checking a chemical cell oxygen analyzer daily. The range of the analyzer is 0 to 1000 PPM, and the procedure states that ambient air be used for the check. The chemical cell costs $350 and has a rated six months life. Cells are being replaced monthly.You Should: - A. Try to find a supplier of the sensor cells that is not as expensive. B. recommend a different type analyzer be used. C. recommend that a calibration system be installed using a 1000 PPM calibr...

What are the 3 funtions of an Oil Burner nozzle? - Answer- Atomize, Meter, Patter. What are the 2 voltage circuits of a primary control? - Answer- Line & Low. What is the function of a fuse? - Answer- Protect circuit. What is the High Limit cut out? - Answer- Max safe Temp or Pressure setting. What is the High Limit cut in? - Answer- Cut out minus Differential. What is the "Max" Lockout time for a burner with a 3 GPH Flow Rate? - Answer- 45 Seconds. What is the minimum stack ...

ASE A6 Test Prep – Electrical/Electronic Systems - Questions, Answers and Explanations Adding an additional path through which the current can flow has decreased the total resistance of the circuit. Each light drops 12 volts. An ohmmeter is being used to check a circuit for continuity. Technician A says an infinity or full scale reading on an ohmmeter indicates no continuity. Technician B says a zero reading on an ohmmeter indicates continuity. Who is right? A. Technician A only B. Technician...

APT4801 Assignment 6 2023 (TEST NO 6) 100% TRUSTED workings, explanations and solutions. For assistance call or whatsapp us on +25479 811 9845 . QUESTION 1 [22] Three-zone mho relays are used for transmission line protection of the power system shown in figure 1 The line impedances are Line 1 – 2: j60  Line 2 – 3: j40  Line 2 – 4: j70  The rated voltage for the HV buses is 400 kV. The CT and VT ratios at B12 are 2 000/1 and 3 600/1, respectively. Figure 1 power netwo...

CETa Practice Test Questions and Answers Already Passed What is voltage in an electrical circuit? a. The rate of flow of electric charge b. The total resistance in a circuit c. The electrical potential difference between two points d. The energy consumed by a circuit What unit is used to measure electrical frequency? a. Volts b. Amperes c. Hertz d. Ohms What is the purpose of a resistor in a circuit? a. To increase voltage b. To store electrical energy 2 c. To lim...

ATT Test 8 (NEW 2024/ 2025 Update) Questions and Verified Answers| 100% Correct| Graded A QUESTION When reverse biased higher than Vz, what is the output voltage of shunt regulator? Answer: Vz QUESTION Which component changes resistances to maintain constant V out (zener diode regulator)? Answer: Q1 QUESTION Which component sets output voltage (zener diode regulator)? Answer: D1 (holds Q1 at Vz) QUESTION The voltage on emitter is establ...

Edexcel IGCSE Physics, question and answer average speed = distance / time v = d / t Standard Unit for mass (m) kilogram (kg) Standard Unit for distance (d) or displacement (s) metre (m) Standard Unit for speed (s) or velocity (v) metre/second (m/s) Standard Unit for acceleration (a) metre/second² (m/s²) Standard Unit for Force (F) Newton (N) Standard Unit for time (t) Second (s) Standard Unit for gravitational field strength (g) ...