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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Answer :

Refer to table 7 - 4 , Ans: b) 4th; 5th

Explanation:

Labor per unit of time	Total Output	Marginal Product	Average Product
0	0	--	--
1	25	25	25
2	75	50	37.5
3	175	100	58.33
4	250	75	62.5
5	305	55	61

Marginal Product = Change in Total output / change in number of labor

Average product = Total output / Number of labor

Refer to Figure 9- 6, Ans: a) Firm A is earning profits, Firm B is breaking even, and Firm C is suffering losses.

Explanation:

Firm A is earning profit because ATC < Price

Firm B is breaking even because P = MC = ATC

Firm C is suffering losses because ATC > Price

Refer to Figure 11- 2, Ans: e) P= AR = MC

Explanation:

Under perfect competiton , the profit maximization condition is where price equals marginal cost ( P = MC).

P = AR = MR = MC

Refer to Figure 10- 2, Ans: e) greater than zero, but less than Q2

Refer to Figure 7- 1, Ans: d) the firm will reach its capacity.

Explanation:

When MP is zero then TP is maximum . It means the firm is at its full capacity. After this point TP will start to decrease.

Refer to table 7 - 5 , Ans: e) $22

Explanation:

Average total cost = Total Cost / Quantity

So ATC of producing 25 chairs = $550 / 25 = $22