1
The main source of industrial process water is:
A) Distilled water
B) Groundwater and surface water
C) Sea water only
D) Rainwater only
B) Groundwater and surface water
Which method is used for complete removal of dissolved salts?
A) Filtration
B) Chemical softening
C) Demineralization
D) Sedimentation
C) Demineralization
Cooling tower works mainly on the principle of:
A) Radiation
B) Conduction
C) Evaporative cooling
D) Forced convection
C) Evaporative cooling
Saturated steam is steam that:
A) Is at a temperature higher than saturation temperature
B) Is in equilibrium with water
C) Contains no moisture
D) Is at atmospheric pressure only
B) Is in equilibrium with water
Selection of a steam generator depends on:
A) Fuel cost only
B) Steam pressure and capacity
C) Color of boiler
D) Shape of boiler
B) Steam pressure and capacity
Hardness of water is mainly due to the presence of:
A) Sodium salts
B) Calcium and magnesium salts
C) Iron salts
D) Potassium salts
B) Calcium and magnesium salts
Demineralization of water is commonly achieved using:
A) Lime and soda
B) Activated carbon
C) Ion exchange resins
D) Sand filters
C) Ion exchange resins
Reuse of treated wastewater mainly helps in:
A) Increasing pollution
B) Conservation of water resources
C) Increasing hardness
D) Increasing cost
B) Conservation of water resources
Superheated steam is obtained by:
A) Cooling wet steam
B) Heating saturated steam beyond saturation temperature
C) Condensing steam
D) Mixing steam with water
B) Heating saturated steam beyond saturation temperature
Compressed air is commonly used for:
A) Heating
B) Cooling
C) Instrumentation and control
D) Chemical reaction
C) Instrumentation and control
Temporary hardness of water is caused by:
A) Chlorides
B) Sulphates
C) Bicarbonates
D) Nitrates
C) Bicarbonates
Boiler feed water should be:
A) Hard and alkaline
B) Free from hardness and dissolved gases
C) Rich in dissolved oxygen
D) Highly acidic
B) Free from hardness and dissolved gases
Steam is widely used in chemical industries primarily because it:
A) Is expensive
B) Has high latent heat
C) Is corrosive
D) Has low density
B) Has high latent heat
A fire-tube boiler is one in which:
A) Water flows through tubes
B) Hot gases flow through tubes
C) Steam flows through tubes
D) Air flows through tubes
B) Hot gases flow through tubes
Instrument air must be:
A) Moist and oily
B) Dry and oil-free
C) Hot
D) Dusty
B) Dry and oil-free
Soft water is defined as water that:
A) Contains no dissolved solids
B) Contains low hardness-causing salts
C) Has high alkalinity
D) Has high pH
B) Contains low hardness-causing salts
Scale formation in boilers is mainly due to:
A) Soft water
B) Dissolved gases
C) Hard water
D) High pressure
C) Hard water
Enthalpy of steam is defined as:
A) Heat required to raise temperature
B) Total heat content of steam
C) Pressure energy
D) Flow energy
B) Total heat content of steam
The main function of boiler mountings is to:
A) Increase efficiency
B) Ensure safe operation
C) Increase pressure
D) Reduce fuel consumption
B) Ensure safe operation
Blower air is generally used for:
A) High-pressure applications
B) Low-pressure, high-volume air supply
C) Vacuum generation
D) Steam generation
B
One essential requisite of industrial water is:
A) High turbidity
B) Constant composition
C) High dissolved oxygen
D) High color
B) Constant composition
Water used in cooling towers mainly serves the purpose of:
A) Chemical reaction
B) Heat removal
C) Steam generation
D) Lubrication
B) Heat removal
Wet steam consists of:
A) Only water vapor
B) Only liquid water
C) Mixture of water and steam
D) Superheated vapor
C) Mixture of water and steam
Boiler accessories are used to:
A) Control pressure
B) Improve boiler efficiency
C) Prevent explosion
D) Reduce corrosion
B) Improve boiler efficiency
Fan air is mainly used for:
A) Cooling and ventilation
B) High-pressure compression
C) Chemical reactions
D) Instrumentation
A) Cooling and ventilation