Related Questions

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because
A Convection becomes important
B Conduction becomes important
C Radiation becomes important
D Sub-cooled boiling occurs
In a particular type of welding, flux is prepared in the form of a coarse powder and granulated flux is spread over the joint. What is this type of welding process called?
A Electric arc welding
B Submerged arc welding
C MIG welding
D TIG welding
Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?
A Silica
B Lime
C Alumina
D Fluorite
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
The use of higher flux density in the transformer design
A reduces weight per kVA
B reduces iron losses
C reduces copper losses
D increases part load efficiency
The path of a magnetic flux in a transformer should have
A high resistance
B high reluctance
C low resistance
D low reluctance
The path of the magnetic flux in transformer should have
A high reluctance
B low reactance
C high resistance
D low resistance
The leakage flux in a transformer depends upon
A load current
B load current and voltage
C load current, voltage and frequency
D load current, voltage, frequency and power factor
Which of the following is the main advantage of an auto-transformer over a two-winding transformer?
A Eddy losses are totally eliminated
B Copper losses are negligible
C Saving in winding material
D Hysteresis losses are reduced
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

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