Chemical Engineering - Chemical Engineering Basics

21.
Laser is a device to produce
gamma rays.
microwaves.
a beam of white light.
a beam of coherent light.
Answer: Option
Explanation:
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22.
Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
manganese
phosphorous
magnesium
chromium
Answer: Option
Explanation:
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23.
Minimum thermal efficiency of a steam boiler may be around __________ percent
25
45
65
20
Answer: Option
Explanation:
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24.
The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.
768
908
1400
1539
Answer: Option
Explanation:
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25.
Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
below the yield point.
above the yield point.
below the elastic limit.
at the elastic limit.
Answer: Option
Explanation:
No answer description is available. Let's discuss.