Metrology And Measurements Set 7

Mechanical Engineering

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This set of Metrology and Measurements Multiple Choice Questions & Answers (MCQs) focuses on Metrology And Measurements Set 7

Q1 | In liquid in steel bulb thermometer, which liquid can be used for measuring temperature up to 60000C?
  • mercury
  • ether
  • water
  • none of the mentioned
Answer: mercury
Explaination:
mercury as a liquid provides temperature range of -4000c to 65000c.
Q2 | Which of the following is used as indication instrument in a liquid expansion system?
  • bellows
  • bourdon tube
  • ammeter
  • thermometer
Answer: bourdon tube
Explaination:
bourdon tube converts pressure into displacement and in liquid expansion systems output expansion pressure is applied to bourdon tube for indication.
Q3 | Which of the following is true for bimetallic type thermometer?
  • two metals have same temperature coefficients
  • two metals have different temperature coefficient
  • one metal is cooled always
  • none of the mentioned
Answer: two metals have different temperature coefficient
Explaination:
in a bimetallic type thermometer, two metals are used which are different in temperature coefficients.
Q4 | When bimetallic thermometer heated, curling occurs to the side of metal with least temperature coefficients.
  • true
  • false
Answer: true
Explaination:
a bimetallic type thermometer, when heated curls to the side of metal with least temperature coefficient. number of curls will be proportional to temperature applied.
Q5 | Analogous quantities of heat flow and temperature in electrical are                             and                                
  • potential and current
  • current and potential
  • power and potential
  • current and power
Answer: current and potential
Explaination:
heat flow in the thermal system is analogous to current flow in electrical, and temperature between two points is analogous to potential between two points in electrical.
Q6 | Ratio of net amount of heat received and stored in the body for certain time interval is known as                                    
  • temperature
  • thermal coefficient
  • thermal storage capacity
  • none of the mentioned
Answer: thermal storage capacity
Explaination:
thermal storage capacity denoted by c is the ratio of the net amount of heat received and stored in the body.
Q7 | Heat transfer coefficient of a material with length l is                    
  • k/l
  • l/k
  • 1/k
  • kl
Answer: k/l
Explaination:
heat transfer coefficient of a material is the ratio of k and l, where k is the thermal conductivity of material and l is the length of the heat transfer path.
Q8 | Resistance temperature detector is
  • a electrical transducer
  • a mechanical transducer
  • a chemical transducer
  • a physical transducer
Answer: a electrical transducer
Explaination:
resistance temperature detector is an electrical transducer. it is used for measuring the variation in temperature. it is also known as a resistance thermometer.
Q9 | Relation between temperature and resistance of a conductor is                  
  • rt = rref [1+t]
  • rt = rref [1+α∆t]
  • rt = rref [1-αt]
  • rt = rref [1-t]
Answer: rt = rref [1+α∆t]
Explaination:
the relationship between temperature and resistance of a conductor is given by
Q10 | Sensing element in the thermometer must provide                  
  • small change in resistance
  • no change in resistance
  • large change in resistance
  • infinite change in resistance
Answer: large change in resistance
Explaination:
the sensing element in a thermometer must give a large change in the resistance for a given change in the temperature.
Q11 | Resistance thermometer provides the change in electrical resistance.
  • true
  • false
Answer: true
Explaination:
a resistance thermometer provides a change in the electrical resistance with respect to a variation in the temperature. basically resistance thermometers work on the principle of change in the electrical resistance with variation in the temperature.
Q12 | If the sensing element is large, then less amount of heat is required.
  • true
  • false
Answer: false
Explaination:
when the sensing element in a resistance thermometer is small in size, then less quantity of heat is required to raise the temperature. platinum, nickel and copper are the commonly used metals for measuring temperature.
Q13 | Most metallic conductors have a                  
  • neutral temperature coefficient of resistance
  • negative temperature coefficient of resistance
  • positive temperature coefficient of resistance
  • zero temperature coefficient of resistance
Answer: positive temperature coefficient of resistance
Explaination:
in general metallic conductors have a positive temperature coefficient of
Q14 | In a temperature sensing element                  
  • low value of α is required
  • infinite value of α is required
  • α must be zero
  • high value of α is required
Answer: high value of α is required
Explaination:
in order to achieve a large change in the value of resistance for a small change in the value of temperature, high value of α is required. change in resistance is measured through a wheatstone’s bridge.
Q15 | Nickel and its alloys can be used over a temperature range of                  
  • 100 to 450 k
  • 10 to 50 k
  • 0 to 25 k
  • 5 to 15 k
Answer: 100 to 450 k
Explaination:
temperature sensors constructed using nickel and its alloys can be used in the temperature range of 100 to 450
Q16 | How can corrosion be prevented in a resistance thermometer?
  • by immersing the setup in oil
  • by enclosing the elements in a glass tube
  • by using guard rings
  • by painting the elements
Answer: by enclosing the elements in a glass tube
Explaination:
corrosion can be eliminated in a resistance thermometer by enclosing the elements in a protective tubular glass made of pyrex, quartz or crystal depending upon the temperature range.
Q17 | What is the relation between variation due to observation, manufacturing process and measuring process of a product?
  • σobservation = σprocess + σmeasurement
  • σobservation = σprocess – σmeasurement
  • σobservation = σprocess * σmeasurement
  • σobservation = σprocess / σmeasurement
Answer: σobservation = σprocess + σmeasurement
Q18 | What is the maximum permissible error for class I micrometers?
  • 0.002 mm
  • 0.004 mm
  • 0.008 mm
  • 0.016 mm
Answer: 0.004 mm
Q19 | Which of the following is true for the calibration of instruments?
  • in casting and fabrication shops the measurements made are of more precise nature as compared to those made in machine shop and tool room
  • periodical calibration is made for optical measuring instruments
  • there is no need of periodic calibration in universal microscope
  • preventive maintenance is not necessary for optical measuring instruments
Answer: periodical calibration is made for optical measuring instruments
Q20 | What is the permissible error in straight movement of longitudinal and transverse table in horizontal plane?
  • 0.002 mm
  • 0.003 mm
  • 0.004 mm
  • 0.005 mm
Answer: 0.002 mm
Q21 | Which of the following is true for checking the Relative perpendicular motion of the longitudinal and transverse carriage?
  • the permissible error allowed is 0.005 mm in 2500 mm length.
  • this is checked using a slip gauges
  • precision square of class i or 0 is used
  • maximum error in precision error is of ± 10″ in squareness
Answer: precision square of class i or 0 is used
Q22 | What is the maximum permissible error in wear of centres?
  • 0.04 mm
  • 0.03 mm
  • 0.02 mm
  • 0.01 mm
Answer: 0.01 mm
Q23 | What is the least count of dial indicators which can be calibrated using passmeter?
  • 0.01 mm
  • 0.03 mm
  • 0.05 mm
  • 0.07 mm
Answer: 0.01 mm
Q24 | Which of the following is caused by careless handling?
  • systematic error
  • gross error
  • random error
  • none of the mentioned
Answer: gross error
Q25 | ‘A system will be error free if we remove all systematic error’.
  • true
  • false
Answer: false
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