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Question 2 Why use dc motors when ac power is delivered on the line? a. dc...
6. Explain why high speed motors have a higher power to weight ratio than low speed...
6. Explain why high speed motors have a higher power to weight ratio than low speed motors. Explain the reason for applying a reduced voltage to d.c. motors at start up. Describe how to change the speed and direction of rotation of a separately excited dc motor from 2000 rpm forward to 2000 rpm reverse direction.
1. Is the power supply for a transformer AC or DC? Explain in detail why only...
1. Is the power supply for a transformer AC or DC? Explain in detail why only this type of power supply will work. 2. Some configurations with the iron core have low efficiency while others have high efficiency. What is the iron core doing to cause this? Be specific. (Hint: think about how a transformer works.) 3. For an ideal transformer the energy must be conserved, so the average power (P=IV) in the two circuits must be equal. Therefore, if...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Qu...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Question-4: Calculate the speed regulation (full load - 12 lbf.in) using the equation: 2-143) 143 (no load Regulation (full load speed) Speed regulation- % Part-II - Motor Efficiency Calculation: Set the dynamometer control knob at its full CW position (to provide the maximum starting load for the shunt-wound motor). Turn on the power...
DC-AC inverters have many commercial and residential applications, including uninterruptible powe...
DC-AC inverters have many commercial and residential applications, including uninterruptible power supply (UPS) units, adjustable speed drives (ASD) for AC motors, and electronic frequency changer circuits. They are also used in solar electrical systems where batteries are charged from solar panels and used as the input DC voltage source. The inverter circuit converts the DC into AC voltage of desired frequency. Most of us are also familiar with HVDC transmission systems, where high voltages are first converted from AC to...
Experiment 7 BJT Power Amplifiers ipolar junction transistors when used as power amplifiers must be able to provide power to drive a load -anywhere from a few watts to hundreds of watts. Heat dis...
Experiment 7 BJT Power Amplifiers ipolar junction transistors when used as power amplifiers must be able to provide power to drive a load -anywhere from a few watts to hundreds of watts. Heat dissipation and efficiency are considerations with any power amplifier including BJT power amplifiers. Except in low-power applications, the class-A amplifier is not widely used because it is not particularly efficient. In Part 1 of this experiment, you will measure the power gain and efficiency of a simple...
One or two sentence answers are fine. But please be clear with explanations. For each statement,...
One or two sentence answers are fine. But please be clear with explanations. For each statement, decide whether it is always true, always false or true in certain circumstances. State which case applies to the statement, describing why you chose the answer you did and cite an experiment or principle of Physics which supports` your claim. [1] In a capacitor in an AC circuit, the electric field leads the current. [2] The impedance of a capacitor increases with frequency. [3]...
1. Why can the DSO only measure node voltages when the Function Generator is the power supply in ...
1. Why can the DSO only measure node voltages when the Function Generator is the power supply in a circuit (unless it is using a current probe)? 2. Consider Figure 1. According to the calculations in the lab handout, if Z-1kΩ +/6914, then the phase difference (фи-фі) between u(t) and i (t) is 34.6". a. If this v(t) and i(t) were displayed on a DSO (v(t) being a node voltage and using a current probe for i(t) as shown in...
The current in a series RLC circuit is minimum when the AC power supply is operating...
The current in a series RLC circuit is minimum when the AC power supply is operating at the circuit's resonant frequency Magnetic field lines can, but do not always form closed loops No matter the frequency, light waves always propagate at a speed of A stationary charged particle can be affected by an external magnetic field, In a mass spectrometer, two particles are launched into a uniform magnetic 2 8 299792458 m/s. 1 via magnetic force field with identical charges...
HELLO my english is not good enough to paraphrase this paraphrase this passage any trial will be so appracoated . typing is better than handwritting , no plagarisim please . goooood luck Here is a bas...
HELLO my english is not good enough to paraphrase this paraphrase this passage any trial will be so appracoated . typing is better than handwritting , no plagarisim please . goooood luck Here is a basic list of the components you’ll need in order to build yourself a drone: Frame: there are two possibilities when it comes to a frame for your drone. You can make it yourself or buy it in an online store, and for a wide choice...
Question 38 2 pts The benefits a distributor can accrue from making appropriate (i.e., good) dock...
Question 38 2 pts The benefits a distributor can accrue from making appropriate (i.e., good) dock-level decisions include which of the following: o An increase in the number of vehicles the distibutor uses O An increase in a distributorうs transportation expenses. O An increase in capital investment of equipment O An improvement and more responsive customer service. O All of the above are considered benefits in good dock-level decisions. Question 46 2 pts As the new profit center manager, you...
6. Explain why high speed motors have a higher power to weight ratio than low speed motors. Explain the reason for applying a reduced voltage to d.c. motors at start up. Describe how to change the speed and direction of rotation of a separately excited dc motor from 2000 rpm forward to 2000 rpm reverse direction.
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Question-4: Calculate the speed regulation (full load - 12 lbf.in) using the equation: 2-143) 143 (no load Regulation (full load speed) Speed regulation- % Part-II - Motor Efficiency Calculation: Set the dynamometer control knob at its full CW position (to provide the maximum starting load for the shunt-wound motor). Turn on the power...
DC-AC inverters have many commercial and residential applications, including uninterruptible power supply (UPS) units, adjustable speed drives (ASD) for AC motors, and electronic frequency changer circuits. They are also used in solar electrical systems where batteries are charged from solar panels and used as the input DC voltage source. The inverter circuit converts the DC into AC voltage of desired frequency. Most of us are also familiar with HVDC transmission systems, where high voltages are first converted from AC to...
Experiment 7 BJT Power Amplifiers ipolar junction transistors when used as power amplifiers must be able to provide power to drive a load -anywhere from a few watts to hundreds of watts. Heat dissipation and efficiency are considerations with any power amplifier including BJT power amplifiers. Except in low-power applications, the class-A amplifier is not widely used because it is not particularly efficient. In Part 1 of this experiment, you will measure the power gain and efficiency of a simple...
1. Why can the DSO only measure node voltages when the Function Generator is the power supply in a circuit (unless it is using a current probe)? 2. Consider Figure 1. According to the calculations in the lab handout, if Z-1kΩ +/6914, then the phase difference (фи-фі) between u(t) and i (t) is 34.6". a. If this v(t) and i(t) were displayed on a DSO (v(t) being a node voltage and using a current probe for i(t) as shown in...
The current in a series RLC circuit is minimum when the AC power supply is operating at the circuit's resonant frequency Magnetic field lines can, but do not always form closed loops No matter the frequency, light waves always propagate at a speed of A stationary charged particle can be affected by an external magnetic field, In a mass spectrometer, two particles are launched into a uniform magnetic 2 8 299792458 m/s. 1 via magnetic force field with identical charges...
Question 38 2 pts The benefits a distributor can accrue from making appropriate (i.e., good) dock-level decisions include which of the following: o An increase in the number of vehicles the distibutor uses O An increase in a distributorうs transportation expenses. O An increase in capital investment of equipment O An improvement and more responsive customer service. O All of the above are considered benefits in good dock-level decisions. Question 46 2 pts As the new profit center manager, you...
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