A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %.
Find the horse power of the motor without counterweight
A. 150.
B. 160.
C. 170.
D. 180.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
To calculate the horsepower (HP) of the motor without a counterweight, we can use the following formula:
HP = (Load in lbs * Speed in ft/min) / (33,000 * Efficiency)
Given:
Load = 900 lbs
Car weight = 855 lbs
Speed = 110 ft/min
Overbalance = 40% (This value is not used in the calculation of horsepower)
Efficiency = 45%
First, we need to calculate the effective load by subtracting the car weight from the total load: