Computer Programming MCQs

5739 MCQs  (Page 259 of 574)

Which of the following methods is used for air cooling of turbo-alternators ?
A. One sided axial ventilation
B. Two sided axial ventilation
C. Multiple inlet system
D. All of the above
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 value of exciting or magnetizing current depends upon which of the following factors ?
A. Total m.m.f. required
B. The number of turns in the exciting winding
C. The way in which the winding is distributed
D. All of the above
By which of the following methods motor rating for variable load drives can be determined ?
A. method of average losses
B. equivalent current method
C. equivalent torque method
D. equivalent power method
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
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
Tractive magnets are operated from____________?
A. c. supply
B. D.c. supply
C. Either a.c. or d.c. supply
D. None of the above
____________are used for construction of core of electromagnets?
A. Soft magnetic materials
B. Hard magnetic materials
C. Either a. or b.
D. None of the above
Which of the following methods is most accurate ?
A. Equivalent current method
B. Equivalent power method
C. Equivalent torque method
D. Method of average losses