Board Exam Questions 2019 & 2022 Flashcards
The purpose of tanning in the leather industry is to
stiffen the leather
Zirconia probe is used for the continuous measurement of ___ flue gases going out of the furnace
oxygen in
The reaction, C + CO2 ⥦ 2CO, taking place during coal gasification is called the ____ reaction
Boudouard
What chemical known as an oxygen scavenger is used for the complete deoxygenation of boiler feed water to minimize corrosion in high-pressure high-temperature boilers?
Sodium sulphite
In order to avoid the substantial cost of installing high-pressure tubes, what is used in the design and operation of high-temperature reactors?
Heat transfer fluids
What is the importance of sodium hexametaphosphate conditioning of high-pressure boiler water?
Inhibits calcium carbonate precipitation
Vanilla comes from the immature fruit of a plant with the scientific name Vanilla Planifolia. What kind of plant is it?
Orchid
What form of control mode is added to the proportional control where the derivative section responds to the change of the error signal and NOT the amplitude?
Rate control
Considering a substance B with constant thermal conductivity, what would be the expression of the thermal resistance if the steady state flow is perpendicular to the slab based on Fourier’s Law?
R = B/kA
In the use of refractory materials, a mixture of silica and alumina forms a eutectic at what condition?
94.5% SiO2 at 1,545 deg C
Who described temperature as “the thermal state of a body considered with its ability to communicate heat to other bodies”?
James Clerk Maxwell
When designing a reactor, what must be considered in searching for optimum efficiency?
Economics of the overall process
In a combination of metals, what happens if the ff substances such as Cl-, OH-, NO3-, or NH4+ are present?
Intergranular corrosion
What mode of control is employed wherein the greater the magnitude of the error, the larger is the corrective action applied?
Proportional
What makes the resistance temperature detector (RTD) different from the thermistor?
The max temperature range is between 1,300K to 2,000 K
