Related Questions

The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
A 50 %
B 60 %
C 100 %
D 150 %
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings
The price of raw meterials had gone up by 15% labor cost has also increased from 25% of the cost of ras material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?
A 28%
B 17%
C 27%
D 24%
Aluminium bronze contains aluminium and copper in the ratio of
A 50 : 50
B 40 : 60
C 60 : 40
D 10 : 90
The machinability of aluminium increases when _________ is added to aluminium.
A Copper
B Magnesium
C Silicon
D Lead and bismuth
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:
A The heating effect of current alone
B Hysteresis loss alone
C Both the heating effect of current and hysteresis loss
D Intense sunlight at noon
A cost was sold for Tk. 75 . The cost was sold for 150% of the cost of the cost. How much did the coat cost ?
A Tk. 150
B Tk. 45
C TK. 50
D TK. 60
If restated, the sentence, that would best replace 'As a conductor of heat and electricity, aluminium exceeds all metals except silver and gold.'
A Silver and gold are exceeded only by Aluminium as conductors of heat and electricity
B With the exception of aluminium, silver and gold are better than any other metal as conductors of heat and electricity
C Silver and gold are better conductors of hear and electricity than aluminium is
D Aluminium is a better conductor of heat and electricity than silver and gold
Which of the following is a good conductor of heat but bad conductor of electricity ?
A Asbestos
B Celluloid
C Straw Board
D Mica
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
A The value of current
B The weight of the conductor
C The direction of the conductor
D None of the above

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