Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 52, Problem 3SQ
What three alignment checks should be made to ensure satisfactory and long service for directly coupled and belt-coupled power transmissions?
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Chapter 52 Solutions
Electric Motor Control
Ch. 52 - What are the disadvantages of low-speed, directly...Ch. 52 - What type of AC motor can be directly coupled at...Ch. 52 - What three alignment checks should be made to...Ch. 52 - What special tools, not ordinarily carried by an...Ch. 52 - Prob. 5SQCh. 52 - Prob. 6SQCh. 52 - How tightly should V-belts be adjusted?Ch. 52 - Prob. 8SQCh. 52 - A machine delivered for installation has a 2-inch...
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- Explain the role of protective relays in ensuring the safety and reliability of power systems.arrow_forwardIf the armature resistance of a 3-phase, 318.75 kVA, 2300-V synchronous generator is 0.35 ohms per phase, the synchronous reactance is It is 1.2 ohms. Calculate the excitation voltage and voltage regulation for the following load cases: a) Full load, back power factor of 0.8 and rated voltage. b) Full load, forward power factor of 0.6 and rated voltage.arrow_forwardYour only control over the load voltage is the adjustment of a variable resistance in parallel with the load, what does this imply about the APU’s output voltage (directly across the generator terminals), compared to the target load voltage?arrow_forward
- Inductive reactance, resistance, and impedance are always present in circuit serving motors. Which of the three actually determines the required conductor size?arrow_forwardQ1: Describe the application of the following distance types of relay. (i) Definite-distance relay. (ii) Time-distance relay Q2:What is Translay System?  Q:3What is the difference between a balanced voltage relay and a Translay relay? Q4:Describe Generator protection scheme in Details?arrow_forwardWhich NEC table is used to determine the full -load running current for single-phase motors?arrow_forward
- State if the statement is true or false. Over-powering results in high overhead charges, inefficient operation, and damage to driven machines.arrow_forwardThe following information is given for a 300 kw, 600 V long shunt compound generator. Shunt field resistance = 75 Ω, armature resistance including brush resistance = 0.03 Ω, commutating field winding resistance = 0.011 Ω, series field resistance = 0.012 Ω, diverter resistance = 0.036 Ω. When the machine is delivering full load, calculate the voltage, power generated by the armature and efficiency.arrow_forward3 phase , delta connection , 2 pole , 1000 Volt , 50 Hz asynchronous motor 2920 RPM (friction losses will not be considered) a) calculate the iron losses of the engine ? b)calculate the output power of the engine ? c)calculate the input power ? d) effiency ? thank you :)arrow_forward
- What is the role of protective relays in ensuring the safety of power systems?arrow_forwardWhich of the following factor is responsible for negative voltage regulation of a DC generator? Under compunding Over compounding Flat compounding Critical resistancearrow_forwardWhat is a Vertical Speed Indicator? -Operation-Partsarrow_forward
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