Related Questions

The core used in high frequency transformer is usually
A copper core
B cost iron core
C air core
D mild steel core
Which of the following property is not necessarily desirable in the material for transformer core?
A Mechanical strength
B Low hysteresis loss
C High thermal conductivity
D High permeability
Which of the following properties is not necessarily desirable for the material for transformer core?
A Low hysteresis loss
B High permeability
C High thermal conductivity
D Adequate mechanical strength
Which of the following is the costliest material of construction used in pressure vessel construction?
A Low alloy steel
B Lead
C Titanium
D High alloy steel
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
The output transformer used in a power amplifier is a ___________ transformer
A 1:1 ratio
B Step-up
C Step-down
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
The permeability of a core material is an indication of the ability of the material to establish a magnetic field.
A True
B False
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
The applied voltage of a certain transformer is increased by 50%, while the frequency is reduced by 50%. The maximum core flux density will
A become three times
B become 1.5 times
C become half
D remian the same

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