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For the following questions answer them individually
The fuse is installed in which ofthe following wire?
Neutral
Phase
earth
All options are correct
The wave form of the armature m.m.f. in DC machine is ...................
square
rectangular
triangular
sinusoidal
Light waves travel with a velocity of ............
$$3 \times 10^{10}$$ cm/s
$$3 \times 10^{12}$$ cm/s
$$3 \times 10^{15}$$ cm/s
$$3 \times 10^{18}$$ cm/s
Light is producedin electric discharge lampsby. .........
Heating effect of current
Magnetic effect of current
Ionisation in a gas or vapour
Carbon electrodes
A DC generator can be termed as .........
rotating amplifier
prime mover
power pump
None of these
Arc blow is a welding defect which is encountered in
Arc welding using DC current
Arc welding using AC current
Gas welding
Thermit welding
Which of the following has the highest value of thermal conductivity?
Aluminium
Brass
Copper
Iron
During resistance welding heat produced at the joint is proportional to. ...........
Current
Voltage
$$I^2R$$
Volt-amperes
Which of the following is tetravalent?
Quartz
Diamond
Germanium
Antimony
The acceptor type of impurity is .............
phosphorous
aluminium
boron
iron
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