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Electrical Machine Design MCQs

Free 104+ Electrical Machine Design MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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104 questions in this list. Select an option to practice, or open a question for the full page with explanation.

Electrical Machine Design — MCQs for Pakistan government job tests

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Electrical Machine Design

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1.How does the input impedance of a JFET compare to that of a conventional transistor?

2.What level of permeability does cold rolled grain-oriented steel exhibit along the grain direction?

3.What type of winding configuration is typically used in transformers when cylindrical coils are made with round conductors?

4.In transformers, multi-layer helical windings are typically employed as high voltage windings for which voltage range?

5.What type of magnetic permeability does cold-rolled grain-oriented steel exhibit along the grain direction?

6.In which type of transformer are helical windings typically employed?

7.Disc windings are mainly employed in which type of transformers?

8.For transformers with what capacity range is the forced circulation of oil and air commonly implemented?

9.How is the heat dissipation enhanced in transformers with ratings exceeding 30 kVA?

10.Up to what capacity do transformers typically use a cooling radiator system that relies on natural cooling?

11.Why is voltage regulation necessary in electrical power distribution systems?

12.What is the primary factor to consider when designing insulation?

13.What is the typical current density range used for large power transformers that utilize forced oil circulation or water cooling coils?

14.What is the appropriate flux density value for 275 kV transformers that use cold-rolled grain-oriented steel?

15.What is the typical configuration of D.C. windings in terms of layering?

16.Which of the following winding types is commonly used for the high voltage winding?

17.What is the minimum flash point temperature that transformer oil must exceed?

18.What is the typical range of maximum magnetic flux density for distribution transformers that use hot rolled silicon steel?

19.What range of current density is typically applied for large power transformers that are either self-oil cooled or air blast cooled?

20.Which formula is commonly used to calculate the insulation thickness required between low voltage and high voltage windings?

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