Mechatronics Set 7

Mechanical Engineering

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This set of Mechatronics Multiple Choice Questions & Answers (MCQs) focuses on Mechatronics Set 7

Q1 | Electrical strain gauge works on the principle of                      
  • variation of resistance
  • variation of capacitance
  • variation of inductance
  • variation of area
Answer: variation of resistance
Q2 | The strain gauge is not bonded to the specimen.
  • true
  • false
Answer: false
Q3 | Bonding element in a strain gauge must have                      
  • zero insulation resistance
  • low insulation resistance
  • high insulation resistance
  • infinite insulation resistance
Answer: high insulation resistance
Q4 | Commonly used elements for wire strain gauges are                      
  • nickel and copper
  • nickel and gold
  • gold and brass
  • silver and aluminium
Answer: nickel and copper
Q5 | Cement is classified under                      
  • 4 types
  • 2 types
  • 6 types
  • 8 types
Answer: 2 types
Q6 | Proper functioning of a strain gauge depends on                      
  • strain
  • stress
  • bonding
  • length of wire
Answer: bonding
Q7 | Proper bonding causes errors in strain gauges.
  • true
  • false
Answer: false
Q8 | What principle defines eddy current inspection (ECI)?
  • lenz law
  • biot-savart law
  • electromagnetic induction principle
  • faraday’s law
Answer: electromagnetic induction principle
Q9 | ECI is generally restricted to a depth below
  • 1µm
  • 1mm
  • 2mm
  • 6mm
Answer: 6mm
Q10 | What is the reason for the limitation of depth below 6mm in ECI?
  • surface coating
  • electron hole pair generation
  • skin effect
  • residual stresses
Answer: skin effect
Q11 | The total resistance of the coil of ECI is known as                      
  • impedance
  • inductance
  • reactance
  • capacitance
Answer: impedance
Q12 | ECI is only used for ferromagnetic materials.
  • true
  • false
Answer: false
Q13 | Standard penetration depth varies from material to material.
  • true
  • false
Answer: true
Q14 | What is acoustic impedance (in MPa s/m) of aluminum?
  • 1.58
  • 45.72
  • 16.77
  • 41.08
Answer: 16.77
Q15 | Which of the following is the poorest transmitter of sound?
  • oil
  • water
  • air
  • copper
Answer: air
Q16 | Which of the following is the best transmitter of sound?
  • oil
  • aluminum
  • steel
  • copper
Answer: steel
Q17 | What is the drawback of ultrasonic testing?
  • low depth
  • high sensitivity
  • shape restriction
  • higher errors
Answer: high sensitivity
Q18 | What is a type of piezoelectric crystal?
  • natural
  • normal
  • angle
  • transverse
Answer: natural
Q19 | The object under inspection must have parallel surfaces.
  • true
  • false
Answer: true
Q20 | Ultrasonic testing is destructive testing?
  • true
  • false
Answer: false
Q21 | Hall Effect is a/an                            
  • electronic
  • magnetic
  • galvanic
  • ionizing
Answer: galvanic
Q22 | Which of the following represents the correct expression of Lorentz force?
  • eh/b
  • eeh/b
  • eeh
  • none of the mentioned
Answer: eeh/b
Q23 | Hall potential is inversely proportional to magnetic flux density.
  • true
  • false
Answer: false
Q24 | Hall Effect is clearly visible in
  • pure conductors
  • semiconductors
  • super conductors
  • metals
Answer: semiconductors
Q25 | Force exerted by magnetic field in Hall Effect transducers is                          
  • lorentz force
  • hall effect force
  • magnetic force
  • electric force
Answer: lorentz force
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