Design of Electrical Machines Mock Test 8

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Question 1 of 10

1. What is the displacement of the running and the starting windings used?

starting winding displaces the running winding by 90°

running winding displaces the starting winding by 180°

starting winding displaces the running winding by 180°

running winding displaces the starting winding by 90°

Question 1 of 10

Question 2 of 10

2. What is the formula for the rotor bar skew angle?

rotor bar skew angle = 3.14 / rotor slot pitches through which bars are skewed * (no of rotor slots / number of poles)

rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed * (no of rotor slots * number of poles)

rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots * number of poles)

rotor bar skew angle = 3.14 * rotor slot pitches through which bars are skewed / (no of rotor slots / number of poles)

Question 2 of 10

Question 3 of 10

3. How many parameters are present in the single phase induction motor?

Question 3 of 10

Question 4 of 10

4. What is the relation of the number of slots with the leakage reactance?

small number of slots, small leakage reactance

small number of slots, high leakage reactance

large number of slots, small leakage reactance

large number of slots, high leakage reactance

Question 4 of 10

Question 5 of 10

5. What is the ratio of power factor of the 75 watt to 750 watt motor?

0.55 : 0.60

0.50 : 0.65

0.55 : 0.65

0.50 : 0.60

Question 5 of 10

Question 6 of 10

6. How many parameters are present under the leakage reactance calculations?

Question 6 of 10

Question 7 of 10

7. 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

Question 7 of 10

Question 8 of 10

8. What is the formula of the rotor teeth flux density?

flux density of rotor teeth = maximum flux * (number of rotor slots / number of poles) * length of the teeth * depth of rotor core

flux density of rotor teeth = maximum flux / (number of rotor slots / number of poles) * length of the teeth * depth of rotor core

flux density of rotor teeth = maximum flux / (number of rotor slots * number of poles) * length of the teeth * depth of rotor core

flux density of rotor teeth = 1/maximum flux * (number of rotor slots / number of poles) * length of the teeth * depth of rotor core

Question 8 of 10

Question 9 of 10

9. What is the main motive while choosing the number of rotor slots?

increasing the efficiency

no noise is produced

decreasing the losses

high output is produced

Question 9 of 10

Question 10 of 10

10. How many steps are required in the design of the fan?

Question 10 of 10