Design of Electrical Machines Mock Test 5

10%

Question 1 of 10

1. What is the classification of the iron loss due to the main field?

eddy current loss

hysteresis loss or eddy current loss

hysteresis loss and eddy current loss

hysteresis loss

Question 1 of 10

Question 2 of 10

2. What is the formula for the total space required for the winding?

total space = copper area / space factor

total space = copper area + space factor

total space = copper area - space factor

total space = copper area * space factor

Question 2 of 10

Question 3 of 10

3. Fractional windings are invariably used in synchronous machines.

false

true

Question 3 of 10

Question 4 of 10

4. The rotor is slotted for one-third of its periphery.

true

false

Question 4 of 10

Question 5 of 10

5. What type of strips is made use of for field coils of small alternators?

iron strips

glass covered rectangular strips

bare copper strips

wood covered rectangular strips

Question 5 of 10

Question 6 of 10

6. What is the formula of the resistance of the winding is calculated at 75°C?

resistance of the winding = (Number of field turns * pole proportion / length of mean turns of the coil) / area of the field conductors

resistance of the winding = (Number of field turns * pole proportion * length of mean turns of the coil) / area of the field conductors

resistance of the winding = (Number of field turns / pole proportion * length of mean turns of the coil) / area of the field conductors

resistance of the winding = (Number of field turns * pole proportion * length of mean turns of the coil) * area of the field conductors

Question 6 of 10

Question 7 of 10

7. What is the formula for the area of cross-section of each damper bar?

area of cross section of each damper bar = total area of bars per pole / number of damper bars per pole

area of cross section of each damper bar = total area of bars per pole * number of damper bars per pole

area of cross section of each damper bar = total area of bars per pole + number of damper bars per pole

area of cross section of each damper bar = total area of bars per pole - number of damper bars per pole

Question 7 of 10

Question 8 of 10

8. The overhang has to be highly reinforced in turbo alternators.

false

true

Question 8 of 10

Question 9 of 10

9. What is the formula for the winding height in the design of the field windings?

winding height = height of the pole + height of shoe + space taken by the spool, flanges, etc

winding height = height of the pole – height of shoe - space taken by the spool, flanges, etc

winding height = height of the pole – height of shoe + space taken by the spool, flanges, etc

winding height = height of the pole + height of shoe - space taken by the spool, flanges, etc

Question 9 of 10

Question 10 of 10

10. What is the formula for the flux in pole body?

flux in pole body = leakage coefficient - useful flux per pole

flux in pole body = leakage coefficient + useful flux per pole

flux in pole body = leakage coefficient / useful flux per pole

flux in pole body = leakage coefficient * useful flux per pole

Question 10 of 10