Design of Electrical Machine 2

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Electrical Engineering MCQ Question Papers: Campus Placement

Subject: Design of Electrical Machine 2

Part 2: List for questions and answers of Design of Electrical Machine


Q1. For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:

a) yb is odd, yf is even

b) yb is even, yfis odd

c) both yb and yf are odd

d) both yb and yf are even


Q2. All of the following are ferromagnetic materials EXCEPT

a) Nickel

b) Bismuth

c) Silicon

d) Mild steel


Q3. Diamagnetic: Copper:: Ferromagnetic:

a) Iron

b) Lead

c) Air

d) Water


Q4. Diamagnetic : Ferromagnetic ::

a) Copper: Silver

b) Air: Water

c) Iron: Steel

d) Lead: Cobalt


Q5. Which of the following gives materials in order of increasing values of permeability ?

a) Water, Iron. Copper, Silver

b) Water, Air, Pure iron. Permalloy

c) Cobalt, Aluminium, Copper, Silver

d) Silicon iron. Palladium, Lead, Silver


Q6. By adding silicon to ferromagnetic , materials

a) Electrical resistivity increases and also magnetic permeability increases

b) Electrical resistivity decreases and also magnetic permeability increases

c) Electrical resistivity decreases and magnetic permeability increases

d) Electrical resistivity increases and magnetic permeability decreases 


Q7. Which of the following can be worked with higher flux densities ?

a) Mild steel

b) Silicon iron

c) Cold rolled silicon steel

d) Hot rolled silicon steel


Q8. Hysteresis loss varies with frequency (f) as

a) f

b) f 1.6

c) f 2

d) f 2.6


Q9. Hysteresis loss varies with maximum flux density (B) as

a) B

b) B1.6

c) B2

d) B2.6


Q10. In large bulky materials, the uni-axial anisotropy can be induced by

a) Cold rolling

b) Magnetic annealing

c) Magnetic quenching

d) Any of the above


Q11. Magnetostriction

a) Grain oriented magnetic properties

b) Represents the upper limit to which magnetic properties can be induced

c) Change in dimensions resulting from magnetisation of ferromagnetic materials

d) None of the above


Q12. An ideal insulating material should have low

a) Insulation resistance

b) Dielectric strength

c) Dielectric loss angle

d) Mechanic strength


Q13. The class of insulation used for large rating HV alternators

a) Y

b) A

c) B

d) C 


Q14. Asbestos has

a) Fibrous structure

b) Crystalline structure

c) Grain oriented crystalline structure

d) None of the above


Q15. Asbestos can bear a temperature up to __________ without loosing its insulating properties

a) 100 degree C

b) 200 degree C

c) 300 degree C

d) 400 degree C


Q16. Fibre glass insulation can be used up to temperature of

a) 60 degree C

b) 80 degree C

c) 130 degree C

d) 180 degree C


Q17. Raw form of natural rubber is known as

a) Malamine

b) Milk of lime

c) Epoxy

d) Latex


Q18. Which of the following is the characteristic of ceramic insulators ?

a) These are hard, strong and dense

b) These are stable at high temperatures

c) These are unaffected by commercial acids and alkalies

d) All of the above


Q19. The number of commutator segments in a dc machine is equal to the no. of

a) Coil-sides

b) Turns

c) Coils

d) Slots 


Q20. Dielectric strength of PVC is around

a) 5 kV/mm

b) 10 kV/mm

c) 15 kV/mm

d) 30 kV/mm 


Part 2: List for questions and answers of Design of Electrical Machine


Q1. Answer: c


Q2. Answer: b


Q3. Answer: a


Q4. Answer: d


Q5. Answer: b


Q6. Answer: c


Q7. Answer: c


Q8. Answer: a


Q9. Answer: b


Q10. Answer: d


Q11. Answer: c


Q12. Answer: c


Q13. Answer: d


Q14. Answer: a


Q15. Answer: d


Q16. Answer: c


Q17. Answer: d


Q18. Answer: d


Q19. Answer: c


Q20. Answer: d