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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 9) cis 1,2 dimethyl cyclohexane

a)

 most stable conformation ( every other structure is similar because always one methyl will be in equatorial position and other in axial position)

b)

c)

d) Bromination is less exothermic than fluorination. Bromine is less reactive than fluorine and are muchore selective thus only one product is formed. But fluorine is vigourously reactive and forms many produts.

e) The reaction betweem 1 bromo 1, 2 dimethylcyclohexane and hot ethanol follows fist order nucleophilic substitution reaction (S _N 1) ans well as unimolecular elimination reaction (E1).

f)

mechanism

S _N 1

E1

The major product is  according to saytzeff's rule ( According to Saytzeff Rule the elimination will lead predominantly to the olefin in which the double bond is more highly substituted)

g)

The product is (1R,2R)-1-methoxy-1,2-dimethylcyclohexane

 anticlockwise and least priority towards you - R configuration

 clockwise and least priority away from you - R configuration

h)

 cis 1,2-dimethylcyclohex-1-ene ( the two similar groups are on same side)

 1-methyl-2-methylidenecyclohexane ( neither cis nor trans)

 1,6-dimethylcyclohex-1-ene( neither cis nor trans)

i)