A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
D. All A, B. & C.
Related Mcqs:
- ______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?
A. Collar
B. Flanged
C. Bell and Spigot
D. Expansion - Maximum permissible air velocity in pipelines is about ______________ metre/second ?
A. 5
B. 10
C. 20
D. 40 - Water hammer is caused in steam carrying pipelines, because of ______________________?
A. Partial condensation of steam
B. Vibration of the pipeline
C. High degree of superheat of steam
D. Its exposure to torrential rain - Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is__________________?
A. Black
B. Silver grey
C. Green
D. Yellow - The underground well of a bio gas plant is called the________________?
A. Septic tank
B. Oxidation well
C. Digestor
D. Lagoon - Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in ‘canning’ industry
D. None of these - Runge-Kutta method is used to solve a/an __________________________?
A. Ordinary differential equation of nth order
B. Simultaneous non-linear equation
C. Linear differential equation
D. None of these - Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore ?
A. High fusibility & fluidity
B. High thermal conductivity
C. Low density
D. High chemical activity - Common salt is produced from sea water in India generally by the ________________ method?
A. Freeze drying
B. Solar evaporation
C. Electrolytic
D. None of these - Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________________ method?
A. Diminishing balance
B. Sinking fund
C. Multiple straight line
D. Sum of the years digit
