Design of Electrical Machines Practice Test 8

1. How many data are required for the design of fan?

2. What is the function of the bands when it is placed on overhang?

used to reduce the centrifugal forces

used to balance the centrifugal forces

used to withstand the centrifugal forces

used to increase the centrifugal forces

3. What is the range for the ratio of the resistance to reactance in the split phase motors?

0.45-0.6

0.45-0.55

0.45-0.8

0.40-0.55

4. What is the formula for the output coefficient of the output equation?

output coefficient = 11 / winding space factor * specific magnetic loading * specific electric loading * 10^-3

output coefficient = 11 * winding space factor * specific magnetic loading * specific electric loading * 10^-3

output coefficient = 11 * winding space factor * specific magnetic loading / specific electric loading * 10^-3

output coefficient = 11 * winding space factor / specific magnetic loading * specific electric loading * 10^-3

5. What is the special feature of single phase induction motor?

high starting torque

zero starting torque

low starting torque

average starting torque

6. The flux density of the stator core should not exceed 1.3 weber per m².

true

false

7. What is the form of the progressive windings?

three layer diamond coil windings

single layer diamond coil windings

double layer diamond coil windings

multi layer diamond coil windings

8. What is the formula for the fundamental relationship for the design of the ventilation system?

head of air inside the machine = hydrodynamic resistance * volume of air passing²

head of air inside the machine = hydrodynamic resistance + volume of air passing²

head of air inside the machine = hydrodynamic resistance - volume of air passing²

head of air inside the machine = hydrodynamic resistance / volume of air passing²

9. What is the relation of the total slot leakage reactance with number of stator slots?

slot leakage reactance is indirectly proportional to the square of the number of stator slots

slot leakage reactance is directly proportional to the number of stator slots

slot leakage reactance is directly proportional to the square of the number of stator slots

slot leakage reactance is indirectly proportional to the number of stator slots

10. What is the relation between slot leakage reactance and specific slot permeance?

slot leakage reactance is indirectly proportional to the square of the specific slot permeance

slot leakage reactance is directly proportional to the specific slot permeance

slot leakage reactance is indirectly proportional to the specific slot permeance

slot leakage reactance is directly proportional to the square of the specific slot permeance