Explain construction and working of Bimetallic Thermometer with neat sketch.

Explain construction and working of Bimetallic Thermometer with neat sketch.
by

1 Answer

Answer :

Bimetallic thermometer: Diagram

image

Construction and working: Bimetallic strip consists of two strips of metal such as invar and brass welded together, each strip made from a metal having a different coefficient of thermal expansion. Whenever the welded strip is heated, the two metals change length in accordance with their individual rates of thermal expansion. The two metals expand to different lengths as the temperature rises. This forces the bimetallic strip to bend towards the side with low coefficient of thermal expansion as shown in Fig above. If one end of the bimetallic strip is fixed so that it cannot move, the distance the other end bends is directly proportional to the square of the length of the metal strip, as well as to the total change in temperature, and is inversely proportional to the thickness of the metal. The movement of the bimetallic strip is utilized to deflect a pointer over a calibrated scale. 

by

Related questions

Describe construction of bimetallic thermometer

Description : Describe construction of bimetallic thermometer

Last Answer : Construction and working : Figure shows construction of bimetallic thermometer, it consists of bimetallic strip usually in the form of a cantilever beam, which is prepared from two thin strips ... . This type of thermometer is used in homes and offices for indicating ambient temperature.

Explain working principle of bimetallic thermometer.

Description : Explain working principle of bimetallic thermometer.

Last Answer : Working principle: Figure shows construction of bimetallic thermometer, it consists of bimetallic strip usually in the form of a cantilever beam, which is prepared from two thin strips of different ... the thickness of the metal. Pointer is attached to the free end to indicate the temperature

Explain construction and working of Combination Die with neat sketch.

Description : Explain construction and working of Combination Die with neat sketch.

Last Answer : Combination Die: In this both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram. Figure shows a combination of blanking and drawing die.In this ... as blank holder when the drawing punch descends and draws the blank into the desired shape.

Explain in detail principle, construction and working of Radiation Pyrometer with neat sketch.

Description : Explain in detail principle, construction and working of Radiation Pyrometer with neat sketch.

Last Answer : Radiation pyrometer Principle: According to Stefan Boltzmann's law, the intensity of radiant energy emitted by a hot target varies as the fourth power of its absolute temperature. ... is calibrated in terms of target temperature by using either a voltmeter or Wheatstone bridge circuit.

Explain Construction and working of Francis Turbine with neat sketch.

Description : Explain Construction and working of Francis Turbine with neat sketch.

Last Answer : The main parts of the Francis turbine are: 1) Penstock: It is the large pipe which conveys water from the upstream of the reservoir to the turbine runner. 2) Spiral casing: It is a closed passage ... After doing the work the water is discharge to the trail race through the draft tubes.

Explain the construction and working of induced draft cooling tower with neat sketch.

Description : Explain the construction and working of induced draft cooling tower with neat sketch.

Last Answer : Induced draft cooling tower :  Diagram: Construction and working: Cooling towers are employed to cool utility cooling water by direct contact with air. The parts of a cooling tower are ... top pulls the hot air through the fills and cooled water gets collected in the cold water basin.

With neat sketch explain the construction and working of heat exchanger used for handling corrosive liquid.

Description : With neat sketch explain the construction and working of heat exchanger used for handling corrosive liquid.

Last Answer : Graphite block heat exchanger:   Graphite heat exchangers are well suited for handling corrosive fluids. Graphite is inert towards most corrosive fluids and has very high thermal conductivity. Graphite being ... vertical faces direct the service fluid through the exchanger in a cross flow.

Explain with neat sketch the construction and working principle of megger.

Description : Explain with neat sketch the construction and working principle of megger.

Last Answer : Megger: Construction of Megger : Two coils: the current coil and pressure coil are mounted at an angle on the same spindle and form the part of the moving system. These coils are ... force produces a torque that is used to deflect the pointer of the device which gives some reading.

Explain with neat sketch; the construction and working principle of Repulsion type moving iron instrument.

Description : Explain with neat sketch; the construction and working principle of Repulsion type moving iron instrument.

Last Answer : Repulsion Type Moving Iron Instrument: Construction: It consist of fixed cylinder hollow coil which carries operating current inside the coil there are two soft iron pieces. One of which is ... magnetized with same polarity a repulsive force act on them and moving iron piece gets deflected. 

How accurate must the bimetallic dial thermometer be for inspecting the temperature of food?

Description : How accurate must the bimetallic dial thermometer be for inspecting the temperature of food?

Last Answer : Feel Free to Answer

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ? (A) Invar (B) Constantan (C) Chromel (D) Alumel

Description : Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ? (A) Invar (B) Constantan (C) Chromel (D) Alumel

Last Answer : (A) Invar

The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement. (A) Brass for low (B) Nickel alloys for high (C) Both 'a' & 'b' (D) Aluminium for all

Description : The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement. (A) Brass for low (B) Nickel alloys for high (C) Both 'a' & 'b' (D) Aluminium for all

Last Answer : (C) Both 'a' & 'b'

Describe with neat sketch the construction and working of surface condenser

Description : Describe with neat sketch the construction and working of surface condenser

Last Answer : Construction- It consists of horizontal cast iron cylindrical vessel pack with tubes, through which the cooling water flows. The ends of the condenser are cut off by vertical perforated type plates into ... ; the secondary function of condenser is to supply pure and hot feed water to boiler.  

Describe the construction and working of D-MPFI and L-MPFI with help of neat sketch.

Description : Describe the construction and working of D-MPFI and L-MPFI with help of neat sketch.

Last Answer : D-LMFI System: It is Manifold fuel injection system.In this type, the vacuum in the intake manifold and volume of air by its density are sensed in this type of MPFI system .As air enters into ... intake manifold , the air flow sensor measures the amount of air and sends information to ECU.

Give construction working principle of RTD with a neat sketch.

Description : Give construction working principle of RTD with a neat sketch.

Last Answer : Diagram Working: An RTD (resistance temperature detector) is a temperature sensor that operates on the measurement principle that a material's electrical resistance changes with temperature. ... change m resistance of the RTD, which is then used to calculate change in temperature.

Describe with neat sketch the construction and working principle of MOSFET.

Description : Describe with neat sketch the construction and working principle of MOSFET.

Last Answer : Construction and working principle of MOSFET:  A) Depletion type MOSFET: Construction: The N-channel depletion type MOSFET is formed on P-type silicon substrate with two heavily ... accumulation of electrons and hence more current. Thus the MOSFET is a gate voltage controlled device.

Explain with neat sketch Phreatic line in earthen dam with pressure head at different point and show construction points of this line.

Description : Explain with neat sketch Phreatic line in earthen dam with pressure head at different point and show construction points of this line. 

Last Answer : Procedure for locating the Phreatic line i) Draw an earthen dam having upstream face AB with water surface. ii) On water surface measure distance BC = 0.3 L C is starting pt of base parabola. Let F' ... parabola i.e. Phreatic line. viii) Here G,Q1,Q2,Q3,Q4 and B represent Phreatic line 

Explain with neat sketch construction of PIN Diode. Draw its characteristics in reverse bias mode.

Description : Explain with neat sketch construction of PIN Diode. Draw its characteristics in reverse bias mode. 

Last Answer : Construction A PIN diode is made up of three semiconductor materials; two heavily doped P- and N- type material separated by an intrinsic (undoped) semiconductor (I) as shown in above figure ... . This advantage allows the PIN diode to process even weak signals.  Characteristics

Explain the construction of ‘Disc Brake’ with neat sketch.

Description : Explain the construction of ‘Disc Brake’ with neat sketch.

Last Answer : Construction of Disc Brake: Modern vehicles always equipped with disc brakes on at least the front two wheels. It consists of mainly 3 parts, [1] Rotor [2] Caliper [3] Brake pads In ... drum. Friction surface directly exposed to air cooling which results better (faster) heat dissipation. 

Write the procedure of construction of WBM road with neat sketch showing various components

Description : Write the procedure of construction of WBM road with neat sketch showing various components

Last Answer : Construction Procedure:  a) Preparation of Foundation: The foundation for receiving the layer of WBM may be either the sub-grade or sub-base or base course. The depressions and pot holes on the existing road ... water and rolled. No traffic is allowed till WBM layer sets and dries out. 

Describe with neat sketch construction details of clutch plate.

Description : Describe with neat sketch construction details of clutch plate.

Last Answer : Fig:- Single Plate Clutch Constructional details : It consist of steel plate with a splined central hub. Annular friction facing are attached to the steel plates by rivets. Special resins are ... are similar type of slots in each of the two plates situated on either side of the hub flang 

Illustrate with neat sketch the construction of fuel injector

Description : Illustrate with neat sketch the construction of fuel injector

Last Answer : Diesel Fuel Injector: The injector assembly consists of - i) a needle valve ii) a compression spring iii) a nozzle iv) an injector body. When the fuel is supplied to lift the injection pump it ... and hence the valve opening pressure is controlled by adjusting the screw provided at the top.  

Describe in brief with neat sketch construction of tunnel with needle beam method

Description : Describe in brief with neat sketch construction of tunnel with needle beam method

Last Answer : In this method stout timber beam known as needle beam is used which forms the main temporary support during the excavation. Construction steps: (a) First of all a small drift of about 1 1 m is ... . (d) After excavation, the lining is provided to the tunnel section and mucking is done. 

Describe the construction of high pressure mercury vapour lamp with neat sketch

Description :  Describe the construction of high pressure mercury vapour lamp with neat sketch

Last Answer : Construction:-  It consists of an inner bulb generally of silicon, to withstand high temperatures. The bulb contains a small quantity of mercury and argon. It is protected by outer glass, this ... : The function of power factor improvement capacitor is to improve the power factor 0.5 to 0.95

State with neat sketch the construction of three phase autotransformer.

Description : State with neat sketch the construction of three phase autotransformer.

Last Answer : Operation: Working principle is based on self-induction. When three-phase ac supply is given to star connected three windings, flux is produced and gets linked with each phase winding. The emf ... . Depending upon the position of variable terminal, we get variable AC voltage at the output.

Explain with a neat sketch the working of the apparatus used for distillation on laboratory scale.

Description : Explain with a neat sketch the working of the apparatus used for distillation on laboratory scale. 

Last Answer : There are two apparatus used for distillation on laboratory scale. 1. Simple apparatus. 2. Still apparatus. Simple apparatus: Working: 1. Water is filled in the round bottom flask. ... level device is fitted in such a way that only heated water free from gases enters the boiler. 

Explain working of Gobar Gas plant with a neat sketch.

Description : Explain working of Gobar Gas plant with a neat sketch.

Last Answer : It is a type of composting plant. In this plant gobar gas is produced from solid waste which is biodegradable in nature. A mixture of gases is produced by breakdown of organic matter in the absence of ... Dioxide. It is used as a fuel and the digested sludge is used as fertilizer for crops

State and explain the working principle of hydrodynamic spring with neat sketch.

Description : State and explain the working principle of hydrodynamic spring with neat sketch.

Last Answer : Working principle: Hydrodynamic springs are comparatively small, thick walled cylinder in which the spring effect is produced by applying load to the fluid in the cylinder through a small ... These springs are particularly useful in applications requiring high load capacities and stiffness.  

Explain the working of Ackerman steering gear mechanism with neat sketch.

Description : Explain the working of Ackerman steering gear mechanism with neat sketch.

Last Answer : Working: The whole mechanism of Ackerman Steering gear is on the back of the front wheels. The Ackerman steering gear consists of turning pairs The slotted links AM and BH are attached ... each end. The steering is affected by moving CD to the right or left of its nominal position. 

Draw the neat sketch of overhead valve operating mechanism and explain its working.

Description : Draw the neat sketch of overhead valve operating mechanism and explain its working.

Last Answer : Overhead valve mechanism: Figure shows the valve mechanism to operate the valve when it is in the cylinder head (in I and F head design). This type of mechanism requires two additional moving parts the push ... close. A spring (attached to the valve) returns the valve to its seated position.   

Explain working of over head valve mechanism with neat sketch.

Description : Explain working of over head valve mechanism with neat sketch.

Last Answer : Overhead valve mechanism: Figure shows the valve mechanism to operate the valve when it is in the cylinder head (in I and F head design). This type of mechanism requires two additional moving parts the ... to close. A spring (attached to the valve) returns the valve to its seated position.  

Draw a neat lebelled sketch of optical square. Explain its working.

Description : Draw a neat lebelled sketch of optical square. Explain its working.

Last Answer : Working of optical square1. Optical square works on principle of optical square to set perpendicular offset 2. Keep ranging rods at point B and C as shown in fig. 3. Observe the ... matched each other point D can be marked on ground and distance CD is measured as perpendicular offset.

Draw a neat sketch of optical square. Explain its working.

Description : Draw a neat sketch of optical square. Explain its working.

Last Answer : Optical Square: Working: The optical square consists of circular box 50 mm in diameter, 12.5 mm in depth. The box has three slits as A,B, and C. bb' is horizon glass, half silvered i.e ... the point on the chain line where the offset can be dropped to meet point J as shown in fig.  

Explain the working of diesel engine glow plugs with neat sketch

Description : Explain the working of diesel engine glow plugs with neat sketch

Last Answer : Glow plug is an aid for cold starting of a C.I. engine. The self-ignition temperature of diesel is 250°C. For compression ignition, the charge (air + diesel) should reach a temperature of ... plugs is automatically interrupted. But starting may be attempted again as soon as the driver wishes.   

With the help of constructional diagram, explain the working of LDR with neat sketch.

Description : With the help of constructional diagram, explain the working of LDR with neat sketch.

Last Answer : Working Principle The resistance depends on the intensity of light, as resistance decreases with increase in light intensity. Characteristics Applications of LDR 1. They are often ... circuits, light intensity meters, for counting the packages moving on a conveyor belt, etc.

Explain the working principal of EDM with a neat sketch.

Description : Explain the working principal of EDM with a neat sketch. 

Last Answer : Let the distance between P and Q be D' which is to be measured. A wave is transmitted from the transmitter at station P' with certain phase angle. . There ... finding the distance, the phase difference between transmitted wave and reflected wave is measured and converted into distance.

With neat sketch explain the working principle of CNC machines.

Description : With neat sketch explain the working principle of CNC machines. 

Last Answer : Working Principle of CNC machine:- A CNC machine also has a tape reader or any other input media for entry of the part program. CNC uses the part program in a different manner though there is ... to the reference. These two signals are compared and necessary action is controlled.   Or  

Explain the working principle of resistance welding with neat sketch.

Description : Explain the working principle of resistance welding with neat sketch. 

Last Answer : Resistance Welding Process: 1.Resistance Spot welding:  Spot welding is employed to join overlapping strips, sheets or plates of metal at small areas. The pieces are assembled between two ... welding small parts. Butt Welding provides joining with no loss of the welded materials.  

Explain the working principle of MIG welding with neat sketch.

Description : Explain the working principle of MIG welding with neat sketch.

Last Answer : MIG Welding: Gas-metal-arc welding is a gas shielded metal arc welding process which uses the high heat of an electric arc between a continuously fed, consumable electrode wire and the material to be ... will not combine with metal. Carbon dioxide is most commonly used as it inexpensive.

Draw neat sketch of Rotameter and explain its working principle.

Description : Draw neat sketch of Rotameter and explain its working principle.

Last Answer : Rotameter: - A variable-area flowmeter is one where the fluid must pass through a restriction whose area increases with flow rate. The height of the float is directly proportional to the flowrate ... on glass tube and the flow rate can be determined by direct observation of the metering tube  

Explain working of water level indicator with neat sketch.

Description : Explain working of water level indicator with neat sketch.

Last Answer : Water level indicator: Working: Its function to indicate water level in boiler. usually two water level indicator are fitted to in front of boiler. WLI shows the water level in in the boiler drum ... goes below a fixed mark , so that corrosive action may be taken in time to avoid accident. 

Explain principle of working of Impulse steam turbine with neat sketch.

Description : Explain principle of working of Impulse steam turbine with neat sketch.

Last Answer : Construction: Impulse turbine is simpler, less expensive and does not need to be pressure proof. It can operate with any pressure stream but is considerably less efficient. Impulse turbine consist of one ... by one set of moving blade ring as shown in Fig. for a single stage impulse turbine.

Explain with neat sketch working of centrifugal pump.

Description : Explain with neat sketch working of centrifugal pump.

Last Answer : Working of centrifugal pump is in three stages i. Priming ii. Starting iii stoping i. Priming- The operation of filling the casing, impeller and suction pipe upto delivery valve ... pump, delivery valve should be closed partly. Motor is switched off and then value is closed fully. 

Explain with a neat sketch the working of Bourdon’s pressure guage.

Description : Explain with a neat sketch the working of Bourdon’s pressure guage.

Last Answer : Working: Bourdon tube pressure gauge is used to measure high pressure. It consists of tube as shown in fig. having elliptical cross section. This tube is called as Bourdons Tube. ... pressure in the case containing the bourdon tube is usually atmospheric, the pointer indicates gauge pressure.

Explain the working of Scotch Yoke mechanism with neat sketch.

Description : Explain the working of Scotch Yoke mechanism with neat sketch.

Last Answer : Scotch yoke mechanism. This mechanism is used for converting rotary motion into a reciprocating motion. The inversion is obtained by fixing either the link 1 or link 3. In Fig. link 1 is fixed. In this ... link 4 (which corresponds to a frame) reciprocates. The fixed link 1 guides the frame

Draw a neat sketch of ‘Locomotive coupler’ mechanism. Explain its working in brief.

Description : Draw a neat sketch of ‘Locomotive coupler’ mechanism. Explain its working in brief.

Last Answer : Figure: Coupler Rod of Locomotive  (Link AD = Link BC = Crank Link CD = Coupling Rod Link AB = Fixed Link = Frame) Working of Coupler Rod of Locomotive: It is an ... center distance between them. This mechanism is meant for transmitting rotary motion from one wheel to the other wheel.

Explain the working of Lamont boiler with neat sketch.

Description : Explain the working of Lamont boiler with neat sketch.

Last Answer : 1. This is a modern high pressure, water tube boiler working on a forced circulation. 2. The circulation is maintained by a centrifugal pump, driven by a steam turbine, using steam from the ... application. Lamont boilers generates 45 to 50 tones steam per hour at 130 bar with 5000 C.

Explain with neat sketch, the working of full wave rectifier voltmeter.

Description : Explain with neat sketch, the working of full wave rectifier voltmeter.

Last Answer : Full Wave Rectifier Type Voltmeter: Working of full wave rectifier type A. C. Voltmeter Referring to the circuit diagram, for rectification, a full wave bridge circuit (ABCD) is used. Input ... current passing through meter is given as, which causes full scale deflection of the meter.

With a neat sketch, explain the working of Thermal relay.

Description : With a neat sketch, explain the working of Thermal relay.

Last Answer : Working of Thermal Relay: 1) When the system is in normal operating condition, the heating element carries normal current from CT, this current produces heat = I2Rt. This heat ... of the spring releases which operates relay contacts resulting into providing trip signal to trip circuit.

Explain with neat sketch working of direct drive SWT. Give any two advantages of it over geared type SWT.

Description : Explain with neat sketch working of direct drive SWT. Give any two advantages of it over geared type SWT.

Last Answer : Direct Drive SWT: This plant has no gear box. Turbine blades are very light weight made up of stiff carbon fibre material. Blades are flat shaped. Due to this shape, lift increases. ... needed is less 4. More reliable 5. Better performance 6. Light weight 7. Less maintenance