Design of Electrical Machines Mock Test 6

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Question 1 of 10

1. What type of core does the electromagnetic consist of?

ferromagnetic

diamagnetic

paramagnetic and diamagnetic

paramagnetic

Question 1 of 10

Question 2 of 10

2. What is the value of specific electric loading for the salient pole alternators?

25,000-40,000 A per m

50,000-75,000 A per m

20,000-40,000 A per m

20,000-45,000 A per m

Question 2 of 10

Question 3 of 10

3. What is the formula of the number of turns per coil?

number of turns per coil = number of conductors/2*coils/slot*number of armature teeth

number of turns per coil = number of conductors/2*coils/slot/number of armature teeth

number of turns per coil = number of conductors*2*coils/slot*number of armature teeth

number of turns per coil = number of conductors*2*coils/slot/number of armature teeth

Question 3 of 10

Question 4 of 10

4. What is the voltage drop in the carbon and graphite brushes?

0.3 V

1 V

0.6 V

0.75 V

Question 4 of 10

Question 5 of 10

5. How is the steady state stability related with the air gap density?

air gap density is directly proportional to the square of the steady state stability

air gap density is directly proportional to the steady state stability

air gap density is indirectly proportional to the steady state stability

Question 5 of 10

Question 6 of 10

6. What is the relation between the flux and the no local speed?

flux is directly proportional to the square of the no local speed

flux is indirectly proportional to the no local speed

flux is directly proportional to the no local speed

flux is indirectly proportional to the square of the no local speed

Question 6 of 10

Question 7 of 10

7. What type of gear is made use of in the high inertia motors?

helical gears

worm gears

spur and helical gears

spur gears

Question 7 of 10

Question 8 of 10

8. What does the copper factor in PMDC motors represent?

it represents the fraction of the field circular area for conductors

it represents the armature circular area for conductors

it represents the field circular area for conductors

it represents the fraction of the armature circular area for conductors

Question 8 of 10

Question 9 of 10

9. How are the air gaps arranged in the flat faced armature type?

mechanical in series and parallel

magnetic in series and mechanical in parallel

magnetic in parallel and mechanical in series

magnetic in series and parallel

Question 9 of 10

Question 10 of 10

10. Name the slots that are commonly used.

rectangular

circular

square sided

parallel sided

Question 10 of 10