# Design of Electrical Machines Questions and Answers – Computer Aided Design & Computer Aided Design of Transformers

This set of Design of Electrical Machines Quiz focuses on “Computer Aided Design & Computer Aided Design of Transformers”.

1. When was the computer aided design introduced and who was the founder?
a) 1950, Heroz
b) 1959, Heroz
c) 1959, Veinott
d) 1956, Veinott

Explanation: The commonly accepted papers to machine design were introduced in the year 1959. It was devised by the author Heroz et al.

2. How many commonly accepted papers are present in the machine design?
a) 3
b) 2
c) 4
d) 5

Explanation: There are 2 commonly accepted papers devised by Heroz et al. They are analytic method and synthesis method.

3. What is the concept of analysis method?
a) the choice of dimension alone is made by designer and provided to computer
b) the choice of dimension and materials are made by designer and provided to computer
c) the choice of dimension, materials and types of construction are made by designer and provided to computer
d) the choice of types of construction are made by designer and provided to computer

Explanation: The analysis method is one of the 2 commonly accepted approaches. The choice of dimension, materials, and types of construction are made by designer and provided to computer.

4. How many different approaches are present in the computer aided design?
a) 2
b) 3
c) 4
d) 5

Explanation: There are 4 types of different approaches present in the computer aided design. They are analysis method, synthesis method, hybrid method, optimisation method.

5. It is fairly easy to program and to use and understand the analysis method.
a) True
b) False

Explanation: Out of the 4 different approaches, analysis method is one commonly used methodology. It is fairly easy to program and to use and understand the analysis method.

6. What happens in the synthesis method?
a) The computer takes its own values
b) Desired performance is given as input to the computer
c) Logical instructions are incorporated in the program
d) Desired performance is given as input along with the logical instruction being incorporated in the program

Explanation: The synthesis method is one of the 4 different approaches in the computer aided design. The desired performance is given as input along with the logical instruction being incorporated in the program.

7. What is the hybrid method of computer aided design?
a) advanced analysis method
b) advanced synthesis method
c) combination of advanced and synthesis method
d) different method

Explanation: They hybrid method is one of the 4 different approaches in the computer aided design. The hybrid method is the combination of advanced and synthesis method.

8. How many transformers are considered in the power system?
a) 2
b) 3
c) 4
d) 5

Explanation: There are 2 types of transformers used in the power system. They are power transformer and distribution transformer.

9. How many design procedures are present in the design of transformers?
a) 10
b) 9
c) 11
d) 8

Explanation: There are 11 design steps present in the computer aided design of transformers. They are core design, window dimension design, yoke design, overall design, low voltage winding design, high voltage winding design, resistance calculation, leakage reactance calculation, loss calculation, efficiency calculation, no load current calculation.

10. What is the symbol used for the maximum flux density in computer aided designing?
a) Bm
b) Bf
c) Bfd
d) Bmf

Explanation: Computer aided design in one of the design algorithms made use of to design various devices. The symbol used for maximum flux density in computer aided design is Bm.

11. What is the symbol used for the number of turns in the secondary winding?
a) T
b) Tsw
c) Ts
d) Tws

Explanation: Computer aided design in one of the design algorithms made use of to design various devices. The symbol used for number of turns in secondary winding in computer aided design is Ts.

12. What is the symbol used for the mean diameter of the HV/LV winding?
a) Dm
b) Dmp
c) Dms
d) Dmp/Dms

Explanation: Computer aided design in one of the design algorithms made use of to design various devices. The symbol used for mean diameter of the HV/LV winding in computer aided design is Dmp/Dms.

13. What is the symbol used for the resistance referred to HV winding?
a) RR
b) RRw
c) RRp
d) RRhw

Explanation: Computer aided design in one of the design algorithms made use of to design various devices. The symbol used for resistance referred to the HV winding in computer aided design is RRp.

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