Dear Readers, Welcome to Power Plant Instrumentation Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Power Plant Instrumentation Interview Questions. These Power Plant Instrumentation Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.
• Coal and ash circuit
• Air and flue gas circuit
• Feed water and steam circuit
• Cooling water circuit
The cooling water circuit consists of a pump, condenser and cooling tower. The coal and ash circuit consists of coal delivery, preparation of coal, handling of coal to the boiler furnace, ash handling and ash storage.
The main purpose of reservoir is to store water received from catchments areas during the
rainy seasons and supply the same during the dry season.
The main purpose of the dam is to increase the height of water level and also to increase the working head of the hydraulic power plant.
The surge tank is used to provide better regulation of water pressure in the system. The surge tank controls the water when the load on the turbine decreases and supplies water when the load on the turbine increases. Thus, surge tank controls the pressure variations resulting from the rapid changes in water flow in penstock and hence prevents water hammer.
The pipe between surge tank and prime mover is known as penstock. It is designed to withstand high pressure. It is made up of reinforced concrete. In very cold areas, the penstock is buried to prevent ice formation and to reduce the expansion joints.
Spillway is like a safety valve of the dam. It discharges major flood without damaging the dam. It keeps the reservoir level below the maximum level allowed.
The high-pressure boilers are used to increase the efficiency of the plant and to reduce the cost of electricity production.
• The amount of scale formation is less, since the velocity of water through pipes are more.
• All parts of the system are heated uniformly, so there is no danger of overheating.
• La Mont boiler
• Benson boiler
• Loeffler boiler
• Velox boiler.
A. Belt conveyors
B. Screw conveyors
C. Bucket elevators
D. Grab bucket elevators
E. Skip hoists
F. Flight conveyors.
The coal transfer starts by carrying of coal from-unloading point to the storage site.
If the fan is located at the bottom of the tower and air is blown by the fan up through the descending water it is called as forced draft cooling towers If the fan is located at the top of the tower and air enters through the louvers located on the tower’s side and drawn up and discharge through the fan casing, it is called as induced draft.
1. Nu.clear fuel
3. Control rods
5. Reactor vessel
6. Biological shielding
Speed is a variable which refers to the revolutions per minute of some piece of rotating equipment.
a) A.C. tacho generator
b) D.C. tacho generator
a) Permanent magnet type
b) Separately excited field type
A.C. ripple is present in the output signal. The magnitude of the ripple is 2% of the output D.C.level.
a) Drag cup rotor
b) Squirrel cage rotor
*Occupies less space