Q. 1 Hard ferrites used in
A. Generators, Relays, Motors
B. Electronics applications
C. Holding devices such as seals, latches
D. All of the above
Ans.: D
Q. 2 Supper-paramagnetic materials, made from powdered iron or other magnetic particles are used in
A. Transformers for electronics
B. cores for inductors
C. Both a and B
D. none of the above
Ans.: C
Q. 3 An example of super paramagnetic material is.
A. cobalt steel
B. alloys of iron
C. Permalloy (molybdenum-nickel-iron powder)
D. all of the above
Ans.: C
Q. 4 The following assumption is based on which of the theory of magnetization?
“ The nature of magnetism is based on the assumption that each of the molecules of a magnetic material is a tiny magnet with opposite polarities at its two ends.”
A. Weber theory of magnetism
B. Atom Domain theory
C. Current carrying conductor produce magnetic field
D. none of the above
Ans.: A
Q. 5 Weber theory of magnetism explain phenomenon such as
A. Induction, Magnetization by rubbing
B. magnetic saturation
C. equality of strength of north and south poles
D. all of the above
Ans.: D
Q. 6 The melting point of a solder is _____than that of the materials to be joint.
A. higher
B. equal
C. lower
D. Any of the above
Ans.: C
Q.7 The molten solders joints the piece of metals. This process is known as_____.
A. Solidification
B. soldering
C. Mixing of two metals
D. none of the above
Ans.: B
Q.8 Soft solder material is an alloy of____.
A. tin and copper
B. tin and iron
C. tin and cobalt
D. tin and lead
Ans.: D
Q. 9 Alloys of copper and zinc is ______.
A. soft solder
B. hard solder
C. Both A and B
D. None of the above
Ans.: B
Q. 10 ______ is the most active and base metal and will go into solution readily.
A. copper
B. silver
C. gold
D. Lithium
Ans.: D
Q. 11 ___ is the most noble metal and will not dissolve easily.
A. Silver
B. Gold
C. Platinum
D. Uranium
Ans.: B
Q. 12 What are the properties of carbon brushes should posses?
A. mirror smooth surface
B. adequate conductivity
C. should not wear out rapidly and should not cause mechanical damage due to friction
D. All of the above
Ans.: D
Q. 13 The tin-lead solders serves to join
A. Copper
B. Brass
C. Bronze
D. All of the above
Ans.: D
Q. 14 The most important applications of hard solders is in______ and of soft solders is in_____.
A. electronics devices, power apparatus for making permanent connection
B. power apparatus for making permanent connection, electronics devices
C. Both used in power apparatus for making permanent connection
D. Both used in electronics devices
Ans.: B
Q. 15 It is possible to partially or completely destroy the magnetic properties of material? Select appropriate option.
A. No
B. Yes, by heating
C. Yes, by hardening
D. Both B and C
Ans.: B