# What is meant by zero circle? State the advantages of digital planimeter over polar planimeter.

What is meant by zero circle? State the advantages of digital planimeter over polar planimeter.

Zero circle:- When the tracing point is moved along a circle without rotation of the wheel i.e. when the wheel slides without any change in reading ,the circle is known as the zero circle or circle of correction.

1) It does not required to take the reading.

2) No calculations are required for area.

3) It gives more accurate reading

4) Less time required for measurement

## Related questions

Description : State importance of digital planimeter over polar planimeter.

Last Answer : Following are the importance of digital planimeter over polar planimeter. 1. No calculations are required for area calculations. 2. Less time required for measurement of area. 3. Gives more accurate result.

Description : State the advantages of digital planimeter..

Last Answer : 1.It gives more accurate reading. 2.No calculation are required for area. 3. Less time required for measurement of area. 4 Area can be measured in any desired unit.

Description : State the possible error while using planimeter for finding area of an irregular figure.

Last Answer : Possible error while using planimeter for finding area of an irregular figure: 1) Instrumental Error i) Roller of planimeter which must rotate the axis freely and withot vibrations, if not, then ... vi) Error in setting of arm length. vii) Overlapping or repetition in tracing boundary.

Description : What are the additive and multiplying constants of planimeter?

Last Answer : Area of the irregular figure measured by planimeter is given by:  Where M = Multiplying constant  C = Additive costant Multiplying Constant: It is the multiplier whose value is marked on ... It is taken in to consideration only when anchor point is inside the figure, else it is zero.

Description : What do you mean by zero circle in area measurement?

Last Answer : Zero Circle - It is the circle formed due to sliding of wheel of mechanical planimeter without changing the reading of circular measuring disc. It is unmeasured circular area on drawing sheet due to non-rotation of counter disc.

Description : Give the simplest method of finding the area of zero of a zero circle from manufacturers table.

Last Answer : The area of zero circle can be find out simply by using following formula. A = M x C Where, A = Area of zero circle  M = Multiplier or multiplying constant provided in manufacturers table C = Constant of planimeter provide in manufacturers table

Description : Define zero circle.

Last Answer : For a mechanical or polar planimeter, when the tracing point moves along a circle without rotation of the wheel i.e. when the wheel just slides without any change in reading, the circle is known as the zero circle.

Description : Define zero circle. How it is found out?

Last Answer : Zero circle or circle of correction is defined as circle round the circumference of which if tracing point is moved, wheel will simply slide(without rotation) on the paper without any change in reading. There ... of zero circle = M C Where M= multiplying constant. C= additive constant.

Description : State any two advantages of total station over dumpy level and theodolite.

Last Answer : Advantages of total station over dumpy level and theodolite :- 1) Total station gives digital measurements of sloping, horizontal and vertical distances accurately and precisely. 2) Total station gives ... data to computer. 6) Total station used to prepare the map and drawings using softwares.

Description : State any four advantages of total station over dumpy level and theodolite.

Last Answer : Advantages of total station over dumpy level and theodolite : 1)Total station gives digital measurements of sloping, horizontal and vertical distances aaccurately and precisely. 2) Total station gives digital ... computer. 6) Total station is used to prepare the map and drawings using softwares.

Description : State two advantages of plane table surveying

Last Answer : 1.it is most rapid method of surveying. 2. it is suitable for magnetic areas. 3.The map can be prepared easily ,and does not require greater skill. 4.Irregular objects can be represented ... is less costly. 7 The check lines detects the errors of measurement and plotting on field itself.

Description : State the advantages and limitation of remote sensing.

Last Answer : Advantages of remote sensing: 1. Relatively cheap and rapid method of acquiring up-to-date information over a large geographical area. 2. It is the only practical way to obtain data from ... knowledge of phenomena you are sampling. 4. Thus one can say that data interpretation is difficult.

Description : State any two advantages and limitations of remote sensing.

Last Answer : Following are the advantages of remote sensing Provides data for large areas. Provide data for very remote and inaccessible area. Easy and rapid collection of data. Rapid production ... Needs cross verification with field survey data. Objects can be misclassified or confused. Expensive.

Description : State any four uses of digital theodolite.

Last Answer : The uses of digital theodolite are as follows. 1. To measure horizontal angle vey precisely up to one second. 2. To measure vertical angle accurately up to one second. 3. To set ... reduced levels of ridge and valley lines accurately. 5. To determine horizontal distance more precisely

Description : State four component parts of digital theodolite and state their purpose.

Last Answer : Component parts of digital theodolite and their purpose: 1. Control panel: to perform operations by giving commands to measure horizontal and vertical angles in left or right direction, to switch on ... fast and steady leveling. 7. Foot screws: for leveling of instrument by usual method.

Description : State any four application of digital theodolite.

Last Answer : Application of digital theodolite:- 1. To measure horizontal angle very precisely up to one second. 2. To measure vertical angle accurately up to one second. 3. To set out control ... reduced levels of ridge and valley lines accurately. 5. To determine horizontal distance more precisely.

Description : Enlist any four component parts of digital level. State the functions of each.

Last Answer : Following are the component parts of Digital Level: 1. Display screen: To show the program going on. It has high resolution. 2.Key Pad- For operating the instrument. 3.Telescope- For ... - Internal focusing is provided, so to observe the object clearly, it is focused with focusing screw.

Description : What is meant by grade contour? How it will be located in field?

Last Answer : It is the contour established on a specific grade or gradient along the hill side. OR The line joining the points of equal grade or gradient is termed as grade contour. Procedure for ... all the marked points will give us the required grade contour of 1 in 30 accurately.

Description : What is meant by permanent adjustment of a theodolite.Enlist any two such adjustment.

Last Answer : A theodolite consist of several fundamental lines .In order reading to be accurate, certain desired relationship must exist between the fundamental lines of the instruments. But due to improper handling or ... axix 4 Adjustment of level tube on the telescope 5 Adjustment of vertical index frame.

Last Answer : Advantages of Total station - 1) Great speed of the work 2) Better accuracy in the measurements 3) Low power consumptions 4) Less time required for work. 5) Less man power required ... Total station - 1) Its high initial cost 2) There are no effective checks over its measurements.

Description : Describe the use of digital theodolite for measurement of horizontal and vertical angle.

Last Answer : I) Procedure for measurement of horizontal angle with digital theodolite: 1) Taking out digital theodolite for box and fix it on tripod over required station. 2) Approximate leveling by leg adjustment and ... and take the reading at B. 9) Difference of two angle gives required vertical angle AOB

Description : Describe the temporary adjustment of digital level.

Last Answer : Temporary adjustment of digital level:- 1) Setup stability:- The digital level should be fixed by rotating its screw head on top of tripod stand. Set tripod legs wide apart to increase the stability ... several times if required. 5) Focus the telescope properly to get clear image of cross hairs .

Description : Explain the procedure for measurement of vertical angle using digital theodolite

Last Answer : Digital Theodolite for measurement of vertical angle. 1)Taking out digital theodolite for box and fix it on tripod over required station. 2) Accurate centering and aapproximate leveling by leg ... required vertical angle from zenith point or horizantal plane as per setting of the instrument.

Description : Explain the procedure of finding area of irregular figure by polar planimeter. Also draw sketch of polar planimeter.

Last Answer : Procedure: 1. Set the scale on the tracing arm as per manufacturer's instruction. 2. Select the position of anchor point inside or outside the figure such that tracing point reaches all positions of ...  Use + sign for clockwise and - sign for anticlockwise crossing of zero of dial.

Description : State the function of Anallatic lens..

Last Answer : The function of anallatic lens is to make additive constant zero i.e.(f+d)=0 It simplifies the calculation.

Description : State any four characteristics of contours with sketches.

Last Answer : Characteristics of contours - The characteristics of contours are described in following statements with the help of necessary sketches. 1. All the points on contour line represent same reduced level or equal ... 8. The summit of four ridge lines represents saddle as shown in sketch 8.

Description : State the component parts of micro optic theodolite . How it is superior to a transit theodolite. Also write the situation where it is suitable.

Last Answer : Component parts of micro optic theodolite 1) Telescope 2) Magnification with standard eyepiece. 3) Level tube 4) Foot screws. 5) Tribatch & Trivet 6) Optical micrometer 7) Changing nob 8) ... is most suitable 3) This instrument is durable for harsh environments. 4) It is simple in use.

Description : Define tacheometry. State the principle of tacheometry with sketch.

Last Answer : Tacheometry : It is the branch of angular surveying in which horizontal and vertical distances are determined from instrumental observations only, is known as tacheometry. Principle of tacheometry : ... to corresponding staff intercept remains constant as shown below in figure 3

Description : State any two situations under which tacheometry is preferred.

Last Answer : Tacheometry is preferred in following situations. 1. When horizontal distances can't be measured by chaining on highly uneven ground. 2. When vertical distances or reduced levels can't be measured ... is necessary to fill the details in topographic map and contour map with low degree of precision.

Description : State any four uses of transit theodolite.

Last Answer : Transit theodolite is useful for the following. 1. To measure the horizontal and vertical angles between survey stations. 2. To measure deflection angles between survey lines. 3. To measure horizontal ... tubular compass to it. 6. To prolong or extend the survey line up to required destination.

Description : State the meaning of degree of curve and long chord.

Last Answer : Degree of curve : The angle subtended at the centre by a standard chord of 30 m length, is known as degree of curve. Long Chord : The straight line joining rear tangent point and forward tangent point is called as long chord of curve.

Description : State the principle of EDM with sketch.

Last Answer : Principle of EDM:- The fig shows a survey line AB, the length D of which is to be measured using EDM equipment placed at ends A. Let a transmitter be placed at A to propagate electromagnetic waves towards B ... measured at A. This will require EDM timing devices with an accuracy of 1 10-9s.

Description : State the limitations of tacheometry.

Last Answer : Tacheometry is a surveying method that uses optical instruments, such as a theodolite or total station, to measure horizontal and vertical angles and distances. Some limitations of tacheometry include: ... and experience of the operator, and human error can lead to inaccuracies in the measurements.

Description : State the methods of contour interpolation and explain in brief any one.

Last Answer : Methods of interpolation:- i) By Arithmetic calculations ii) By Estimation iii) By Graphical method i) By Arithmetic Calculation: This is very tedious but accurate method and is used for small areas ... in fig.) may now be pricked through the position of the contour points on line PQ.

Description : State the application of remote sensing in various fields.

Last Answer : Applications of remote sensing:-  Remote sensing is widely applicable in the following areas. 1) Applications of Remote sensing with respect to natural hazard. e. g In case of flood, ... resource like minerals and fossil fuels, geological data, location of minerals, mapping of mineral zones.

Description : State the methods of locating contours and explain direct method.

Last Answer : Methods of locating contours :- 1) Direct method 2) Indirect method i) By cross section ii) By Squares (Block Contouring) iii) Tachometric Method Direct method of contouring:- In ... identical coloured pegs, we get the required contours on ground by this direct method of contouring.

Description : State the two methods of setting out curves.

Last Answer : Methods of setting out curves :- 1) Method of offsets or ordinates from the long chord 2) By successive bisection of arcs 3) By offsets from tangents 4) By offsets from chords produced 5) Rankine’s method of tangential angles 6) Two Theodolite method

Description : State the procedure of traversing by using total station.

Last Answer : The procedure is as follows. A) CENTERING THE TOTAL STATION: The instrument must be vertically above the survey station to ensure that horizontal angle observations are correct. The steps are as ... are plumbed over peg 1 and 3. Horizontal distances and angles are measured and recorded similarly.

Description : State the uses of Global positioning system (GPS)

Last Answer : Uses of Global positioning system 1. To prepare contour maps. 2. To prepare longitudinal section of roads. 3. To prepare alignment of roads & bridges. 4. Used for navigation purpose.  5. For ... . 8. Used in Geographical information system. 9. Used in Military and Space 10. For Agriculture.

Description : State the classification of electronic distance meter.

Last Answer : Classification of electronic distance meter A) Classification based on the type of carrier wave used Instrument using visible light waves Instrument using invisible infra-red waves ... or transmitted wave. Reflecting type such as geodimeters Transmitting types such as tellurometer

Description : State components of one second micro-optic theodolite.

Last Answer : Component parts of micro optic theodolite 1) Telescope 2) Magnification with standard eyepiece. 3) Level tube 4) Foot screws. 5) Tribatch & Trivet 6) Optical micrometer 7) Microscope with ... -batch with foot screws 12) Plate level 13) Collimation slow motion screw 14 ) Horizontal clamp

Description : State the application of total station.

Last Answer : Application of Total Station:- 1) Measurement of slope distance.  2) Measurement of horizontal distance. 3) Measurement of vertical distance.  4) Measurement of horizontal angle. 5) ... ) Offset station measurement.  17) Co-ordinate area measurement. 18) Scaling measurement function.

Description : State the errors eliminated by repetition method.

Last Answer : The errors eliminated by repetition method are : 1) Errors due to eccentricity of verniers and centers are eliminated by taking the both vernier readings and averaging them. 2) Errors due to ... bisection of object may compensate each other. 5) Errors due to improper levelling can be minimized

Description : State any four uses of contour.

Last Answer : By studying a contour map : 1) The nature of the ground surface or topography of a country whether hilly, undulating or flat can be understood. 2) Possible routes of communication between ... drawn any direction from the contour map. 8) Quantities of earthwork can be determined approximately.

Description : State the practical applications of remote sensing in civil engineering project.

Last Answer : The practical applications of remote sensing in civil engineering project are : 1) Applications of Remote sensing with respect to natural hazard : In case of flood , earthquake ,volcano eruption and ... and satellite imagery used to ascertain the catchment area and command area of dam site.

Description : State the procedure of measurement of horizontal angle by repetition method.

Last Answer : The horizontal angle is measured very precisely using method of repetition as follows : 1) Set-up the theodolite over station O and level it properly. 2) Set the vernier A and vernier B at 0°0'0 ... repeat the same procedure. 9) The mean of both angles gives the horizontal angle AOB.

Description : State Bowditch’s Rule.

Last Answer : Bowditch’s Rule states that the total error in latitude or departure is distributed in proportion to the lengths of the traverse.

Description : State any eight practical applications of E.D.M.

Last Answer : 1. For measurement of horizontal distance 2. For measurement of vertical distance 3. For measurement of sloping distance 4. Measurement of volume of stack. 5. Fixing alignment of railway / highway ... parking of ship in harbor. 8. Cross verification of already measured distance by chain / tape.

Description : Define tacheometer. State essential characteristics of tacheometer.

Last Answer : Tacheometer A tacheometer is essentially a transit theodolite having a stadia diaphragm. The diaphragm is equipped with two horizontal hairs called stadia hairs in addition to the regular cross hairs. ... The vision through the telescope should give a clear and bright image for a long distance.

Description : State any two application of each of GIS in land information and land environmental field.

Last Answer : Applications of GIS in Land information Following are the applications of GIS in land information. Easy creation and maintenance of data for land records. Land planning and land use. ... . Environmentally sensitive zone mapping. Forest cover, soil quality and hydrology coverage.