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

Link will be apear in 30 seconds.

Well done! you have successfully gained access to Decrypted Link.

 

Question:

Determine the ideal efficiency of a diesel engine having a cylinder with bore 200mm and stroke length is 350mm. The clearance volume is 1200cc and fuel cut-off occurs at 5% of the stroke volume. Assume y=1.4.

---

Answer:

Step 1

first of all, we know about the efficiency of diesel engine

Step 2

 length (bore) 200mm and

the stroke length is 350mm.

The clearance volume is 1200cc and

the fuel cut-off occurs at 5% of the stroke volume.

Assume gamma=1.4.

we should find out

clearance ratio=$\frac{V_3}{V_2}$

=1.95

• the ideal efficiency of a diesel engine 

=64.9%