Explain why using the ratio of actual stator current to rated stator current is not a...
Explain why using the ratio of actual stator current to rated stator current is not a good measure of torque, especially at low values of torque
Homework Answers
Ratio of the actual stator current and rated stator current is not a good measure of the torque because stator current also compute losse in which some losses are not proportional to the torque such as iron loss and windage loss. At lower value of torque stator current loss component become comparable to load component therefor at low values of torque ratio of the actual stator current and rated stator current is not a good measure of the torque.
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Explain why using the ratio of actual stator current to rated
stator current is not a...
Can you make sure solution has the answer that is stated above on the right
Can you make sure solution has the answer that is stated above
on the right
3. A 3ф, 460 V, 60 Hz, 50 hp, 1180 rpm induction motor has the following parameters: Ts-0.191 ohms, -0.0707 ohms, Lis 2 mH, (stator leakage inductance) Lr 2 mH (rotor leakage inductance, referred to stator) Lm 44.8 mH Determine the values of the rated stator current Is and rated motor torque Te using the exact T equivalent circuit. Hint: a motor reactance X-jaeL Answer:...
Consider the headcount ratio as a statistic for measuring the extent of poverty. Explain why using...
Consider the headcount ratio as a statistic for measuring the extent of poverty. Explain why using the headcount ratio to guide poverty reduction policies may not be a good idea
a. Would the required rate of return be lower on an A rated bond or a...
a. Would the required rate of return be lower on an A rated bond or a BBB rated bond, and why? b. What is the best measure of risk for an asset held in isolation and in portfolio? c. Is the yield to maturity (YTM) on a bond an estimate or an actual rate of return on a bond? Explain. d. If a stock has a beta measure of 0.75, discuss what this means.
a. Explain why P/E ratio and EPS are used in determining health of a stock? Is...
a. Explain why P/E ratio and EPS are used in determining health of a stock? Is it good to have a low EPS ratio? Why or why not? (8) A skeleton of Heuristic Solution's balance sheet appears as follows (amounts in thousands): A B С D 1 Balance Sheet 2 3 4 5 $ 253 (a) 555 (b) (c) Total current liabilities Long-term debt Other long-term liabilities $ 1.164 (e) 826 Cash Receivables Inventories Prepaid expenses Total current assets Property,...
A three-phase 60 Hz synchronous generator is operating at unity power factor, with the following conditions: line-line voltage stator current field current torque angle Determine: (i) the magnitude o...
A three-phase 60 Hz synchronous generator is operating at unity power factor, with the following conditions: line-line voltage stator current field current torque angle Determine: (i) the magnitude of the induced voltage E, and (ii) the value of the synchronous inductance L 13k V 1000A 80A (a) (b) I s now desired to supply 8MVARs (lagging) while maintaining the same real power as above. Sketch the phasor diagram showing E. V, and I for this case, and determine numerical values...
R1=0.98ohms, pole pairs is 2 since rated speed is 1410 rpm and frequency is 50Hz Using this equivalent circuit, calculat...
R1=0.98ohms, pole pairs is 2 since rated speed is 1410 rpm and
frequency is 50Hz
Using this equivalent circuit, calculate the following
quantities out by hand (showing your working) at rated speed when
operating with rated voltage.
1) Rated slip
2) Rated output torque (using torque equation)
3) Rated output power
4) Magnitude and phase of rated stator current
5) rated input power
6) rated input power factor
7) rated efficiency
1В Ri I X3 I RI V R Xm...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
2. A 208V, two pole, 60 Hz, y connected wound rotor induction motor is rated at...
2. A 208V, two pole, 60 Hz, y connected wound rotor induction motor is rated at 15hp. Its equivalent circuit parameters are R:-0.200, R:-0.120, X.-X-0.410, X-150. The rotational losses are 430W. The motor drives a mechanical load with a slip of 5 percent. By using simplified equivalent circuit calculate; (30 pts) a) The motor speed in revolutions per minute and radians per second. b) The line current c) The stator copper losses. d) The air gap power. e) The power...
Explain why reports of family violence might not be representative of actual occurrences. Why is this...
Explain why reports of family violence might not be representative of actual occurrences. Why is this difficult to assess? How might our current social conditions impact this phenomena?
3. CURRENT RATIO Explain what it means for a firm to have a current ratio of...
3. CURRENT RATIO Explain what it means for a firm to have a current ratio of .50. Would the firm be better off with a current ratio of 1.50? What if it were 15.0? Explain your answers.
Can you make sure solution has the answer that is stated above
on the right
3. A 3ф, 460 V, 60 Hz, 50 hp, 1180 rpm induction motor has the following parameters: Ts-0.191 ohms, -0.0707 ohms, Lis 2 mH, (stator leakage inductance) Lr 2 mH (rotor leakage inductance, referred to stator) Lm 44.8 mH Determine the values of the rated stator current Is and rated motor torque Te using the exact T equivalent circuit. Hint: a motor reactance X-jaeL Answer:...
a. Explain why P/E ratio and EPS are used in determining health of a stock? Is it good to have a low EPS ratio? Why or why not? (8) A skeleton of Heuristic Solution's balance sheet appears as follows (amounts in thousands): A B С D 1 Balance Sheet 2 3 4 5 $ 253 (a) 555 (b) (c) Total current liabilities Long-term debt Other long-term liabilities $ 1.164 (e) 826 Cash Receivables Inventories Prepaid expenses Total current assets Property,...
A three-phase 60 Hz synchronous generator is operating at unity power factor, with the following conditions: line-line voltage stator current field current torque angle Determine: (i) the magnitude of the induced voltage E, and (ii) the value of the synchronous inductance L 13k V 1000A 80A (a) (b) I s now desired to supply 8MVARs (lagging) while maintaining the same real power as above. Sketch the phasor diagram showing E. V, and I for this case, and determine numerical values...
R1=0.98ohms, pole pairs is 2 since rated speed is 1410 rpm and
frequency is 50Hz
Using this equivalent circuit, calculate the following
quantities out by hand (showing your working) at rated speed when
operating with rated voltage.
1) Rated slip
2) Rated output torque (using torque equation)
3) Rated output power
4) Magnitude and phase of rated stator current
5) rated input power
6) rated input power factor
7) rated efficiency
1В Ri I X3 I RI V R Xm...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
2. A 208V, two pole, 60 Hz, y connected wound rotor induction motor is rated at 15hp. Its equivalent circuit parameters are R:-0.200, R:-0.120, X.-X-0.410, X-150. The rotational losses are 430W. The motor drives a mechanical load with a slip of 5 percent. By using simplified equivalent circuit calculate; (30 pts) a) The motor speed in revolutions per minute and radians per second. b) The line current c) The stator copper losses. d) The air gap power. e) The power...
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