Related Questions

Which of the following elements is not suitable for the fabrication of a light emitting diode structure?
A Gallium phosphide
B Indium gallium nitride
C Germanium
D Gallium arsenide
An SCR is made of silicon and not germanium because silicon
A Is inexpensive
B Is mechanically strong
C Has small leakage current
D Is tetravalent
How much power (roughly) a light-emitting diode can couple into an optical fiber?
A 100 microwatts
B 440 microwatts
C 100 picowatts
D 10 milliwatts
E None of the above
Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature?
A Flanged joint
B Expansion joint
C Bell and spigot joint
D None of these
Silicon percentage in silicon steel used for electrical equipments is about
A 1
B 4.0
C 8
D 14
Silicon percentage in the silicon steel used for electrical appliances/equipments is
A 0.3-0.4
B 12-14
C 3-4
D 20-25
Which is the highest carbon-dioxide emitting country in the world?
A USA
B UK
C Germany
D Japan
The law which states that wave-length of maximum radiation is inversely proportional to the absolute of the emitting body is known as:
A Wien’s Displacement Law
B Ohm's Law
C Ferel's Law
D Ampere's Law
Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)
A $$\sqrt {\text{d}} $$
B d
C d2
D d1.5
Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.
A Turning
B Dressing
C Forming
D Surface finishing

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