Instrumentation and Control Systems Mid - I, September - 2014

1.Indicate the externally powered type of instrument transducer
  • Spring balance
  • Centrifugal tachometer
  • Thermocouple or thermopile
  • Photo emissive cell
Answer: D
2.The most appropriate clause pertaining to the development of digital instrument is
  • Fast reading
  • No observation error
  • Better accuracy
  • Possibility of output being fed to a memory circuit
Answer: D
3.Which of the thermocouple can measure temperature in a comparatively high range
  • Iron constant on
  • Copper constant on
  • Chromel alumel
  • Tungsten molybdenum
Answer: D
4.Spot the odd one
  • Mercury in glass thermometer
  • Bi- metallic thermometer
  • optical pyrometers
  • resistance thermometers
Answer: C
5.A pitot static tube measures
  • Undisturbed fluid pressure
  • Difference between dynamic and static pressure
  • Pressure difference between two fluids
  • Dynamic pressure of a moving stream
Answer: B
6.A piezometer tube is used to measure
  • Gauge pressure in static mass of a fluid
  • Undisturbed fluid pressure
  • Pressure difference between two fluids
  • Dynamic pressure of fluid stream
Answer: A
7.Property of a liquid to resist shearing or sliding of its layers
  • Density
  • Viscosity
  • Specific gravity
  • Specific weight
Answer: B
8.Cylindrical and piston type flow meters are
  • Variable area flow meters
  • Variable head flow meters
  • Vortex flow meters
  • Positive displacement flow meters
Answer: D
9.A venturimeter is preferred to an orifice plate because
  • It is cheaper and easy to install
  • Its coefficient of discharge has a constant value
  • Energy or head loss is less
  • Accurate measurement of discharge can be made
Answer: C
10.A quantitative estimate of density changes can be made by
  • Interferometer
  • Shadograph
  • Schlieren system
  • Any of the above
Answer: A
11.The term ______________refers to a piece of equipment having a known measure of physical quantity.
Answer: Standard
12.Measurement provides with means of describing a natural phenomenon in ________________ terms.
Answer: Quantitative
13.When temperature sensors are to be used in a highly corrosive or abrasive media______________ becomes a necessity.
Answer: Thermo pocket
14.The series arrangement of a group of very small thermocouple is called____________________
Answer: Thermopiles
15.________________is used in barometers because it has high density.
Answer: Mercury
16.The standard method of calibrating all pressure transducers is to use a_________________
Answer: Dead weight gauge tester
17.Variable area flow meter are designed so that the differential pressure head remains ___________ and orifice area varies.
Answer: Constant
18.The most common positive displacement meters are _____________ and _______________.
Answer: Petrol pump meters, water meters and gas meters
19.Semiconductor resistors used for temperature measurement are called ________________.
Answer: Thermistors
20.The _________________ is an instrument which gives a direct measure of humidity.
Answer: Slig psychometer