Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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 1. What is the break-even point in sales for product A, B, and C?

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First calculate the weighted average contribution margin ratio for the product mix.

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Calculate the contribution margin ratio per unit for each product individually:

contribution margin ratio = Contribution margin per units / Selling price of each units

Product	A	B	C
Contribution margin per units	6	3	3
Selling price of each units	8	5	4
contribution margin ratio	6 / 8 =0.75	3 / 5 =0.60	3/4 =0.75

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Divide the fixed costs by the contribution margin ratio to calculate the break-even sales for three products:

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Break-even point in sales revenue = Fixed cost / contribution margin ratio

Break-even point in sales units = Fixed cost / contribution margin per units

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Product	A	B	C
Fixed cost	4000	7000	1000
Contribution margin ratio	0.75	0.60	0.75
Contribution margin per units	6	3	3
Break-even sales revenue	$ 5333	$ 11667	$ 1333
Break-even point in sales units	667	2333	333

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2. What is the total profit given the sales mix in the table?

Total contribution - fixed cost = profit

	Product A	Product B	Product C	Total
Contribution (units * Contribution per units )	600*6 =3600	4000*3 =12000	400*3 =1200	$16800
Fixed cost	4000	7000	1000	$12000
Total Profit				$4800