Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
4th Edition
ISBN: 9780357097755
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 24, Problem 2RQ
What advantage does a reactor have when limiting in-rush current that is not available with a resistor?
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Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
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- A wye-connected load has a phase current of 25 A. How much current is flowing through the lines supplying the load?arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forwardState the physical differences between a run and a start capacitor.arrow_forward
- Explain why an SCR must be phase shifted.arrow_forwardAn inductor has an inductance of 0.025 H and a wire resistance of 3 Ω. How long will it take the current to reach its full Ohm’s law value?arrow_forwardSchematics are always drawn to show components in their de-energized or off state.arrow_forward
- Select the proper choice(s) for each of the following statements: 1) To control single-acting cylinder we just need: double-acting cylinder we should use A2/2-way, 5/2-way, (C) 3/3-way, 3/4-way, 2) In DCV. (B) 3/2-way, 4/2-way, (D) 4/3-way, 3/2-way. mid poistion of DCV, we can move cylinder piston rod freely without resistance by hand. (A) working ports are exhausted, (C) working ports are pressurized, 3) In pneumatics we use A Compressor (B) Pump, DCV, while to control the 4) Quick exhaust valve is used to (A) increase the cylinder return speed. (C) meter-out the cylinder speed (B) all ports are closed. no one of these options. to obtain high pressure air. (C) Turbine, (D) pressure relief valve. (B) meter-in the cylinder speed, (D) increase the cylinder extending speed. 6) Meter-in of cylinder movement is used to control the Afluid that enters the hydraulic cylinder, (B) fluid that exits the hydraulic cylinder, (C) fluid that enters the DCV (D) fluid that exits the DCV. 5) One of the…arrow_forwardRefer to the circuit shown in Figure 15-2. Why is there an overload contact symbol shown in series with the compressor contactor but not the condenser fan contactor or evaporator fan contactor?arrow_forwardAnswer and explain correctly. Iarrow_forward
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