A. Soft magnetic materials
B. Hard magnetic materials
C. Either A. or B.
D. None of the above
Related Mcqs:
- ____________are always double layer type?
A. Closed windings
B. Open windings
C. Either of the above
D. None of the above - electromagnets generally function as holding magnets ?
A. Tractive
B. Portative
C. Either of the above
D. None of the above - The design of electromagnets is based upon which of the following fundamental equations ?
A. Force equation
B. Magnetic circuit equation
C. Heating equation
D. Voltage equation
E. All of the above - Which of the following is the commonly used type of electromagnets ?
A. Flat-faced armature type
B. Horse shoe type
C. Flat-faced plunger type
D. All of the above - In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?
A. 5 percent
B. 10 percent
C. 15 percent
D. 30 percent
E. none of the above - The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?
A. minor insulation
B. major insulation
C. either of the above
D. none of the above - 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 - Hydrogen has a heat transfer co-efficient __________ times that of air?
A. 1.5
B. 2.5
C. 3.5
D. 4.5 - By which of the following methods the temperature rise of windings and other parts may be determined ?
A. Thermometer method
B. Resistance method
C. Embedded temperature detector method
D. Any of the above - The cylindrical windings using circular conductors are used for current rating of____________?
A. upto 20 A
B. upto 40 A
C. upto 60 A
D. upto 80 A
