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For the following questions answer them individually
Which typeoflighting schemeis used in stadium ?
direct lighting
indirect lighting
floodlighting
semidirect lighting
The sweepofceiling fan is indicated by
mm
cm
m
km
llumination level required for precision work is around
50 Im/m$$^2$$
100 Im/m$$^2$$
200 Im/m$$^2$$
500 Im/m$$^2$$
Melting temperature of tungstenis
2000k
2500k
2655k
3655k
The transformer used for AC welding setsis
Booster type
Step up transformer
Step down transformer
None of these
In resistance welding, the SCR contactorwill close during _____.
Squeeze time
Hold time
Weld time
Weld as well as off time
It is desirable to operate the arc furnaces at a powerfactor of
Zero
Unity
0.707 lagging
0.707 leading
In flash-butt welding
No special preparation of the faces to be weldedis necessary.
Clean and pure weld is obtained.
Powerrequirementis less
All options are correct
At absolute zero, an intrinsic semiconductor
becomes superconductor
disintegrates into pieces
behaveslike an insulator
becomes extrinsic semiconductor
The conductivity of silicon can be expected around:
$$0.5 \times 10^{14} S/m$$
$$0.5 \times 10^{-3}Â S/m$$
$$0.5 \times 10^{3} S/m$$
$$0.5 \times 10^{-14} S/m$$
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