In direct current motors, by what is the initial in-rush current limited?
What will be an ideal response?
Initial in-rush current is limited by the resistance of the windings. When the armature begins to turn, counter EMF is developed in the armature. Counter EMF is the main current limiting force in a direct current motor.
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What will be an ideal response?
Determine the maximum possible efficiency of the heat engine sketched in the figure.
A) 75%
B) 72%
C) 68%
D) 63%
The body mass index (BMI) of a person is defined to be the person’s body mass divided by the square of the person’s height. The article “Influences of Parameter Uncertainties within the ICRP 66 Respiratory Tract Model: Particle Deposition” states that body mass index 
in men aged 25–34 is lognormally distributed with parameters µ = 3.215 and ? = 0.157.
a. Find the mean BMI for men aged 25–34. b. Find the standard deviation of BMI for men aged 25–34. c. Find the median BMI for men aged 25–34. d. What proportion of men aged 25–34 have a BMI less than 22? e. Find the 75th percentile of BMI for men aged 25–34.
For the cash flow diagram shown, determine the value of G that will make the present worth in year 0 equal to $2500 at an interest rate of 10% per year.
What will be an ideal response?