Design of Electrical Machines Mock Test 8

10%

Question 1 of 10

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

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

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

slot leakage reactance is indirectly proportional to the specific slot permeance

slot leakage reactance is directly proportional to the specific slot permeance

Question 1 of 10

Question 2 of 10

2. What material is used in the tunnel of the rotor of the single phase induction motor?

copper

wood

steel

aluminium

Question 2 of 10

Question 3 of 10

3. What is the value of permissible stress for steel wire for the diameter of branding wire of 0.5-1.2 mm?

600 NM per m²

650 NM per m²

570 NM per m²

700 NM per m²

Question 3 of 10

Question 4 of 10

4. What is the formula for the area of outlet opening?

area of outlet opening = 1/maximum air passing per second * 0.42 * peripheral speed

area of outlet opening = maximum air passing per second / 0.42 * peripheral speed

area of outlet opening = maximum air passing per second * 0.42 / peripheral speed

area of outlet opening = maximum air passing per second * 0.42 * peripheral speed

Question 4 of 10

Question 5 of 10

5. The smaller values are applicable for lower rating machines.

false

true

Question 5 of 10

Question 6 of 10

6. 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

Question 6 of 10

Question 7 of 10

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

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

Question 7 of 10

Question 8 of 10

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

small number of slots, high leakage reactance

large number of slots, high leakage reactance

large number of slots, small leakage reactance

small number of slots, small leakage reactance

Question 8 of 10

Question 9 of 10

9. What is the formula of the mean diameter at the position of centre of gravity?

mean diameter at the position of centre of gravity = Inner diameter * diameter of stator wires

mean diameter at the position of centre of gravity = Inner diameter + diameter of stator wires

mean diameter at the position of centre of gravity = Inner diameter / diameter of stator wires

mean diameter at the position of centre of gravity = Inner diameter – diameter of stator wires

Question 9 of 10

Question 10 of 10

10. What is the specialty in the repulsion motor starting method?

cage winding is replaced by commutator windings

cage winding is replaced by field windings

cage winding is replaced by bearings

cage winding is replaced by armature windings

Question 10 of 10

« Prev - Design of Electrical Machines Mock Test 7

» Next - Design of Electrical Machines Mock Test 9