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EGB111 Quiz 5...

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04/05/2020

Take Test: Quiz 5 – EGB111_20se1 (QUT Blackboard)

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Take Test: Quiz 5

Test Information Description Instructions Multiple Attempts This test allows 5 attempts. This is attempt number 1. Force Completion This test can be saved and resumed later.

QUESTION 1

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If the line of best t for your torque speed curve is described by the following equation, calculate the no-load speed of the motor. T= -0.023x+0.27 11.73

QUESTION 2 If the line of best t for your torque speed curve is described by the following equation, calculate the stall torque of the motor. T= -0.035x+0.33

0.33

QUESTION 3

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If the line of best t for your torque speed curve is described by the following equation. Given what you have observed in the practical and the information provided in the lecture what torque should be expected at peak power? T= -0.047x+0.31

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04/05/2020

Take Test: Quiz 5 – EGB111_20se1 (QUT Blackboard)

Question Completion Status:

Given the following experimental data collected, what is the approximate speed of this motor at peak eciency? Electrical Load Load Rotational Torque Mechancial Power Eciency Mass Force Speed(rad/s) (Nm) Power (W) (W) (kg) (N) 0.74

0.74

8.9

0.0074

0.072

0.36

0.20

0.174 1.72

8.3

0.0172

0.144

0.48

0.30

0.274

7.5

0.0270

0.210

0.62

0.34

0.374 3.68

7

0.0368

0.260

0.73

0.35

0.574 5.64

5.8

0.0564

0.320

1

0.32

0.774

4.2

0.0760

0.320

1.27

0.25

2.7

7.6

QUESTION 5

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If you observe in your experiment that the peak eciency of your motor occurs atω=6.1 and T=0.065 and you need to lift a mass of 205 g, what is the pulley radius (m) that should be used to achieve peak eciency? 0.03

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