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Pulp & Paper Mcqs

Q:

__________ sensors rely on a change of capacitance, resistance, inductance, or reluctance.

A) Point B) Humidity
C) Proximity D) Thermal
 
Answer & Explanation Answer: A) Point

Explanation: A point sensor is any device that permits point measurement. It could either be an absolute point sensor or a relative one (displacement sensor). Point sensors could be linear, angular, or multi-axis.

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Q:

__________ sensors are utilised to measure variables such as point, velocity, acceleration, force, press, levels and flow.

A) Humidity B) Optical
C) Thermal D) Mechanical
 
Answer & Explanation Answer: D) Mechanical

Explanation: Mechanical sensor is an object whose function is to detect changes in its environment, and then provide a corresponding output. It’s a type of transducer; sensors might provide various types of output, but typically utilize electrical or optical signals.

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54
Q:

The objective of process control is to keep key process operating parameters within narrow bounds of the ____________

A) Reference value B) Spot
C) Pith D) Inception point
 
Answer & Explanation Answer: A) Reference value

Explanation: It’s utilized in industry and enables mass production of consistent products from continuously operated processes such as oil refining, paper manufacturing, chemicals, power plants and many others. It enables automation, by which a small staff of operating personnel could operate a complex process from a central control room.

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42
Q:

In pneumatic systems, one common standard calls for a signal output of _________

A) 10-20 kPa B) 20-50 kPa
C) 50-100 kPa D) 20-100 kPa
 
Answer & Explanation Answer: D) 20-100 kPa

Explanation: Pneumatic systems utilized extensively in industry are commonly powered by compressed air or inert gases. A centrally located and electrically powered compressor powers cylinders, air motors, and other pneumatic devices.

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52
Q:

Optical _________ is utilized to measure the temperature of objects. This relies on blackbody radiation.

A) Spectroscopy B) Pyrometry
C) Geometry D) Reflection
 
Answer & Explanation Answer: B) Pyrometry

Explanation: It’s a type of remote-sensing thermometer utilized to measure the temperature of a surface. Various forms of pyrometers have historically existed.

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Q:

_________ have been utilized in thermostats for years. They are mechanically connected to a switch, such as a mercury switch, to control heaters.

A) Unimetal B) Bimetallic
C) Trimetallic D) Quadrametallic
 
Answer & Explanation Answer: B) Bimetallic

Explanation: It’s utilized to convert a temperature change into mechanical displacement. The strip consists of 2 strips of different metals which expand at different rates as they are heated, usually steel and copper, or in some cases steel and brass.

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72
Q:

Noise reduction techniques should be utilized to avoid interfering voltages that might be otherwise generated in the system.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Each input channel is averaged over a programmable period of time to produce 1 measured value. The time is also referred to as integration time. This is extremely helpful at reducing high frequency noise (>1KHz), and could be utilized to reduce power line noise as well by integrating for 1 whole power line cycle.

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47
Q:

Thermocouples consist of a pair of wires made of dissimilar metals joined together at one or more junctions that generate a voltage when subjected to a temperature gradient . This phenomenon is known as the _________

A) Seebeck effect B) Piezolelectric effect
C) Photovoltaic D) Photoconductor
 
Answer & Explanation Answer: A) Seebeck effect

Explanation: The linear electromechanical interaction b/w the mechanical and the electrical state in crystalline materials having no inversion symmetry. This effect is a reversible process in that materials exhibiting the direct piezoelectric effect also exhibit the reverse piezoelectric effect.

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