Engineering :: Metallurgy
11.
Spherical metal powders are usually produced by
A.
Electrolytic process
B.
Automization
C.
Reduction
D.
Oxidation
E.
Milling
Answer: Option B
Explanation:
12.
Normal mercury thermometer can be used upto
Answer: Option C
Explanation:
13.
The upper range of mercury thermometer can be increased by
A.
Increasing tube diameter
B.
Providing steel tube
C.
Taking into account expansion of tube
D.
Filling the stem with nitrogen under pressure
E.
Range cannot be increased
Answer: Option D
Explanation:
14.
Th phenomenon of emf development between two diferent metals placed in contact is known as
A.
Seeback effect
B.
Thomson effect
C.
Peltier effect
D.
Kelvin effect
E.
Thermocouple effect
Answer: Option A
Explanation:
15.
Which thermocouple can measure the highest temperature?
A.
Copper-constantan
B.
Iron constantan
C.
Chromel-alumel
D.
Platinum-rhodium
E.
Tungsten- molybdenum
Answer: Option E
Explanation:
16.
The principle on which a disappearing filamment type pyrometer works is known as
A.
Kirchhoff's law
B.
Fourier's law
C.
Wien's law
D.
Peltier effect
E.
Seeback effect
Answer: Option C
Explanation:
17.
Under identical values of cold and hot junction temperatures which thermocouple given the highest output
A.
Iron constantan
B.
Nickel nimo
C.
Chromel-constantan
D.
Platinum-platinum-rhodium
E.
All give equal output
Answer: Option C
Explanation:
18.
The measurement junction of a thermocouple is taken from an environment of 300?C to 600?C. If time constant of the thermocouple is 1 second, temperature indicated by it, in ?C, after 1 second would be about
Answer: Option D
Explanation:
19.
An instrument which is used for measuring temperature variations by change in a metallic resistance is called a
A.
Thermopile
B.
Bolometer
C.
Thennocouple
D.
thermo-generator
E.
Thermo-galvanometer
Answer: Option B
Explanation:
20.
A solder consists of
A.
Lead and tin
B.
Tin and white metal
C.
Zinc and lead
D.
Zinc and tin
E.
Tin and antimony
Answer: Option A
Explanation:
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