WorksheetsGEAS 57
Total questions: 50
Worksheet time: 25mins
Yellow brass contains approximately how many percent of zinc?
A. 20%
B. 50%
C. 30%
D. 40%
Indicate the false statement.
A. Aluminum bronzes contain no tin
B. Silicon bronzes are usually used for marine application and high-strength fasteners.
C. Bronze is a copper-tin alloy.
D. Tin is relatively soluble in copper.
What is the most abundant metal in nature?
A. Aluminum
B. Steel
C. Iron
D. Copper
Indicate the false statement about aluminum.
A. It has 1/3 the weight of steel.
B. It has 1/3 of the stiffness of steel
C. It has high strength-to-weight ratio.
D. It has poor thermal and electrical conductivity.
What is the effect to aluminum with iron as the alloying element?
A. Reduce hot-cracking tendencies in casting.
B. Improve conductivity
C. Lowers castability
D. Improves machinability
What is the effect to aluminum with copper as alloying element?
A. Increase strength up to about 12%
B. Reduces shrinkage
C. Improves machinability
D. Increases fluidity in casting
Which of the following are two well-known nickel alloys with magnetic properties ideal for permanent magnets?
A. Invar and Nilvar
B. Nichrome and Constantan
C. Elinvar and Invar
D. Alnico and Conife
The Portland cement is manufacture from the following elements except:
A. lime
B. silica
C. alumina
D. asphalt
What gives the average ratio of stress to strain for materials operating in the nonlinear region in the stress-strain diagram?
A. Modulus of elasticity
B. Proportionality limit
C. Secant modulus
D. Tangent modulus
What test determines the hardenability of a steel specimen?
A. Jominy end-quench test
B. The lever rule
C. Gibb’s phase test
D. Stress relief test
What steel relief process is used with hypocutectoid steels to change martenite into pearlite?
A. Tempering
B. Normalizing
C. Annealing
D. Spheroidizing
What is another term for tempering?
A. Recrystalization
B. Annealing
C. Spheroidizing
D. Drawing or toughening
All are steel surface hardening processes except one. Which one?
A. Carburizing
B. Flame hardening
C. Nitriding
D. Annealing
For metric wire gage, the No. 2 wire is ________ in diameter.
A. 0.1 mm
B. 0.2 mm
C. 0.3 mm
D. 0.4 mm
Bus bars of rectangular cross section are generally used for carrying ________.
A. high electric current
B. low electric current
C. high voltage
D. low voltage
What are used for interconnection on printed-circuit boards?
A. Unlaminated flat conductors
B. Insulated conductors
C. Rounded flexible conductors
D. Flat flexible conductors
Yellow brass is a copper alloy with improved mechanical properties but reduced corrosion resistance and electrical conductivity. How many percent of yellow brass is copper?
A. 65%
B. 35%
C. 55%
D. 45%
What type of copper alloy is used as collectors for electric generator?
A. yellow brass
B. Beryllium copper
C. Tin Bronze
D. Phosphor bronze
What is the electrical resistivity of pure copper in μΩ-cm?
A. 1.76
B. 1.71
C. 1.67
D. 3.10
What should be the resistivity in μΩ-cm of a resistor material?
A. 200 – 300
B. 100 – 200
C. 50 – 150
D. 10 – 50
What is the most widely used dielectric material in the electrical and electronics industry?
A. Polymer
B. Plastic
C. Rubber
D. All of the above
What are natural or synthetic rubber like materials which have outstanding elastic characteristics?
A. Thermosetting plastics
B.Polymers
C.Elastomers
D. Thermoplastic plastics
What are cellular forms of urethanes, polystyrenes, vinyls, polyehtylenes, polypropylenes, phenolics, epoxies and variety of other plastics?
A. Thermoplastic plastics
B. Plastic foams
C. Polymers
D. Thermosetting plastics
What is the widely used electrical insulator?
A. Plastic
B. Polymer
C. Epoxy
D. Paper
What is the dielectric strength of an unimpregnated cellulose paper or kraft paper?
A. 6 to 12 MV/m
B. 8 to 14 MV/m
C. 10 to 16 MV/m
D. 12 to 18 MV/m
What is the most widely known carbide?
A. Carbon carbide
B. Lead carbide
C. Germanium carbide
D. silicon carbide
Class I capacitors have dielectric constants are up to _____.
A. 100
B. 200
C. 300
D. 500
What are the typical dielectric constants of class II capacitors?
A. 500 to 10,000
A. 500 to 10,000
C. 500 to 5,000
D. 100 to 1,000
What are the most widely used general-purpose coatings?
A. Alkyds
B. Acrylics
C. Epoxies
D. Vinyls
What is widely used in the electronic industry as a structural member, such as tube envelopes, hermetic seals to metals or ceramics, protective coating on hybrid and integrated circuits, etc.?
A. Glass
B. Plastic
C. Silica
D. Film
What refers to glasses which are devitrified about 100oC below their softening point to form a very fine network of crystalline phase?
A. Fused silica
B. Glass ceramics
C. Fused quartz
D. Fiber glass
The percentage change in magnetic properties of materials resulting from temperature aging called the ____________.
A. aging index
B. aging factor
C. aging coefficient
D. aging point
The change in electrical resistance due to the application of magnetic field is called ____________.
A. magnetic anisotropy
B. magnetoresistance
C. magnetostriction
D. magnetizing factor
Which material is used for de application such as electromagnetic cores and relays?
A. Iron
B. Copper
C. Steel
D. Aluminum
Which of the following is known as “electrical steel”?
A. Silicon steel
B. Stainless steel
C. Carbon steel
D. Cast Steel
What is the highest-frequency ferrite?
A. Garnet
B. Spinel
C. Mumetal
D. Superinvar
Which material is used for Schottky barrier diodes, light-emitting diodes, Gunn diodes and injection lasers?
A. Gallium Arsenide
B. Silicon Carbide
C. Selenium
D. Gallian Phosphide
What material is used for electroluminescent diodes which can emit either green or red light?
A. Gallium Arsenide
B. Silicon Carbide
C. Selenium
D. Gallian Phosphide
Lead compounds such as load sulfide, selenide and telluride may be used for which application?
A. Diodes and transistors at low temperature
B. Infrared detectors
C. Thermoelectric applications
D. All of these
For hardness penetration test, the Rockwell test uses what type of penetrator?
A. Sphere
B. Square pyramid
C. Asymmetrical pyramid
D. Cube
What is the combination of cutting and scratch test of a material?
A. Knoop test
B. Vickers test
C. File hardness test
D. Toughness test
What refers to the strain energy per unit volume required to reach the yield point?
A. Elastic toughness
B. Fatigue
C. Hardness
D. Creep strain
The following are typical properties of ceramics except one. Which one?
A. High melting point
B. High compressive strength
C. High corrosion resistance
D. High thermal conductivity
What refers to the average number of mers in the molecule, typically several hundred to several thousand?
A. Polymerization constant
B. Polymerization factor
C. Degree of polymerization
D. Polemerization index
What nickel alloy has high electrical and corrosion resistance and high strength at red heat temperature and contain 15 to 20% chromium?
A. Alnico
B. Nichrome
C. Invar
D. Nilvar
Silicon bronze contains how many percent of silicon?
A. 96%
B. 3%
C. 1%
D. 69%
What element is added to copper to increase its strength and fatigue properties?
A. Silicon
B. Aluminum
C. Beryllium
D. Zinc
What element is added to copper to make it extremely hard?
A. Aluminum
B. Zinc
C. Lead
D. Silicon
What element constitutes the major component of most bronzes?
A. Zinc
B. Tin
C. Lead
D. Aluminum
What is the most common alloying ingredient in copper?
A. Tin
B. Lead
C. Zinc
D. Aluminum
