1. Which of the following is the major consideration to evolve a good design?
A. Cost
B. Durability
C. Compliance with performance criteria as laid down in specifications
D. All of the above
✅ The correct answer is option D.
Electrical Machine Design MCQs
2. Materials exhibiting zero value of resistivity are known as ____________ ?
A. conductors
B. semiconductors
C. insulators
D. superconductors
✅ The correct answer is option D.
3. __________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?
A. Grey cast-iron
B. Cast steel
C. High carbon steel
D. Stainless steel
✅ The correct answer is option B.
4. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
A. conduction
B. convection
C. radiation
D. any of the above
✅ The correct answer is option C.
5. The change in flux linkages can be caused in which of the following ways ?
A. The flux is constant with respect to time and is stationary and the coil moves through it
B. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
C. Both the changes mentioned above occur together, i.e., the coil moves through a time varying field
D. All of the above
✅ The correct answer is option D.
6. __________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?
A. Cast steel
B. Aluminium
C. Soft steel
D. Cast iron
✅ The correct answer is option D.
7. The input impedance of a JFET is _____________that of an ordinary transistor?
A. equal to
B. less than
C. more than
D. none of the above
✅ The correct answer is option C.
8. Cylindrical windings using circular conductors, employed in transformers, are_____________?
A. single layered
B. double layered
C. multi-layered
D. none of the above
✅ The correct answer is option C.
9. The action of electromagnetic machines can be related to which of the following basic principles __________?
A. Induction
B. Interaction
C. Alignment
D. All of the above
✅ The correct answer is option D.
10. Commercial available medium size machines have a speed range of __________ ?
A. 200 to 400 r.p.m
B. 600 to 1000 r.p.m
C. 1000 to 1500 r.p.m
D. 2000 to 2500 r.p.m
✅ The correct answer is option D.