For testing appliances, the wattage of test lamp should be_____________?
For testing appliances, the wattage of test lamp should be_____________?
A. very low
B. low
C. high
D. any value
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Which one of the following does not have negative temperature co-efficient ____________?
Which one of the following does not have negative temperature co-efficient ____________?
A. Aluminium
B. Paper
C. Rubber
D. MicaIf P is the power of a star connected system then what will be power of an equivalent delta connected system?
If P is the power of a star connected system then what will be power of an equivalent delta connected system?A. P
B. 3P
C. P/3
D. None of the aboveAssume 3 numbers of pure resistive loads each of value R.
When these loads are connected in delta the power in each resistor is V^2/R and the total power is 3×V^2/R.
When these loads are connected in star the voltage applied across each = V/(sqrt of 3). Power in each load becomes = V^2/(3×R) . and the total load is =(3×V^2)/(3×R)=V^2/R. You can see this is 3 times less than the total power when the loads are connected in delta.
One important point is that the loads should withstand higher voltage (line voltage) and higher current when connected in delta than when they are connected in star
so power in delta is 3 time power correct answer is 3PWith rise in temperature the resistance of pure metals______________?
With rise in temperature the resistance of pure metals______________?
A. increases
B. decreases
C. first increases and then decreases
D. remains constantElectric pressure is also called________?
Electric pressure is also called________?
A. resistance
B. power
C. voltage
D. energyIn a series circuit with unequal resistances______________?
In a series circuit with unequal resistances______________?
A. the highest resistance has the most of the current through it
B. the lowest resistance has the highest voltage drop
C. the lowest resistance has the highest current
D. the highest resistance has the highest voltage dropInternational ohm is defined in terms of the resistance of________________?
International ohm is defined in terms of the resistance of________________?
A. a column of mercury
B. a cube of carbon
C. a cube of copper
D. the unit length of wire