# Pulp & Paper Mcqs

Q:

The temperature of a heated metal filament depends on the gas pressure since the gas molecules could conduct heat from the filament.

 A) True B) False

Explanation: Very less pressure i.e., very high vacuums, which signifies a gas phase, requiring specialized techniques. Pressure below 10-3 could be measured with ionization gauges.

24
Q:

Strain ___________ could be mounted on diaphragms to measure pressure; this method has been miniaturized onto integrated circuits.

 A) Sensors B) Lobes C) Gauges D) Gears

Explanation: The most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The gauge is attached to the object by a suitable adhesive, such as cyanoacrylate.

56
Q:

If a fluid is at rest, one refers to static _________ If a fluid is in motion, one refers to dynamic _________ which is a function of the motion of the fluid.

 A) Pressure B) Gravitational force C) Viscosity D) Density

Explanation: The force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure

29
Q:

The __________ factor is the relative change in resistance divided by relative change in length i.e., the definition of strain.

 A) Screw B) Gauge C) Pit D) Kraft

Explanation: Strain gauge is the ratio of relative change in electrical resistance R, to the mechanical strain ε. Metal strain gauges have a gauge factor of about 2; thus a strain of 0.1% would cautilise a 0.24 Ω change in a 120 Ω strain gauge.

31
Q:

__________ could be utilized as a point sensor by measuring a time pulse of __________ takes to echo back to the transmitter. It is similar in principle to a radar.

 A) Radiation B) Reflection C) X- ray D) Ultrasound

Explanation: Ultrasounds are sound waves with frequencies which are greater than the upper audible limit of human hearing. Ultrasound is no different from ‘normal’ (audible) sound in its physical properties, except in that humans couldn’t hear it. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.

18
Q:

__________ sensors is a type of transformer and are the basis of the prevalent L.V.D.T . The signal is easily conditioned to give out a D.C. voltage that in linearly proportional to point over part of the range of motion of the core.

 A) Speed B) Temperature C) TIR D) Reluctance

Explanation: It’s a type of sensor that are the basis of the prevalent L.V.D.T. linear variable differential transformer. The sensitivity could be on the order of 0.001 mm movement.

37
Q:

Variable inductance is achieved by the utilization of __________ core in the shape of a rod which is wraped by a hollow coil of wire.

 A) Ferrimagnetic B) Ferromagnetic C) Paramagnetic D) Diamagnetic

Explanation: As the ferromagnetic core enters the coil the inductance of the coil is replaced. With reluctance sensors, the magnetic flux coupling b/w 2 or more coils is varied by a ferromagnetic core. Inductance is a calculation that relates electrical flux to the current.

23
Q:

A potentiometric displacement sensor utilizes a wire of high resistance with a wiper in electrical contact with the wire.

 A) True B) False