1. What is the primary function of temperature measurement in industrial processes?
(A) To monitor and control heat-related variables
(B) To measure electrical resistance
(C) To control voltage levels
(D) To detect current direction
2. Which of the following devices is used to measure temperature?
(A) Thermocouple
(B) LVDT
(C) Tachometer
(D) Strain gauge
3. The working principle of a thermocouple is based on:
(A) Seebeck effect
(B) Joule effect
(C) Faraday’s law
(D) Doppler effect
4. A Resistance Temperature Detector (RTD) works on which principle?
(A) Change in resistance with temperature
(B) Induced emf with magnetic field
(C) Change in capacitance
(D) Thermal expansion
5. The most commonly used metal in RTDs is:
(A) Platinum
(B) Copper
(C) Iron
(D) Nickel
6. The thermistor has a:
(A) Negative temperature coefficient of resistance
(B) Positive temperature coefficient of resistance
(C) Constant resistance
(D) Constant voltage
7. The Bimetallic thermometer works on the principle of:
(A) Differential expansion of metals
(B) Seebeck effect
(C) Magnetic induction
(D) Change in resistance
8. A pyrometer is used to measure:
(A) High temperatures from a distance
(B) Low temperatures only
(C) Pressure at high altitude
(D) Flow rate of liquids
9. A mercury-in-glass thermometer measures temperature based on:
(A) Expansion of mercury with temperature
(B) Resistance change
(C) Capacitance variation
(D) Induced current
10. The pressure is defined as:
(A) Force per unit area
(B) Work per unit time
(C) Energy per unit mass
(D) Volume per unit force
11. The SI unit of pressure is:
(A) Pascal
(B) Bar
(C) Torr
(D) mmHg
12. A Bourdon tube is used for measuring:
(A) Pressure
(B) Flow
(C) Temperature
(D) Speed
13. In a Bourdon tube, the pressure is converted into:
(A) Mechanical displacement
(B) Electrical signal directly
(C) Magnetic field
(D) Temperature change
14. A diaphragm pressure gauge measures pressure by:
(A) Deflection of a flexible membrane
(B) Expansion of a gas
(C) Magnetic induction
(D) Liquid column height
15. A manometer measures pressure using:
(A) Liquid column height difference
(B) Resistance change
(C) Induced voltage
(D) Capacitance variation
16. A vacuum gauge is used to measure:
(A) Pressure below atmospheric pressure
(B) Absolute pressure
(C) Differential pressure
(D) High flow rate
17. An absolute pressure gauge measures:
(A) Pressure with respect to a perfect vacuum
(B) Pressure relative to atmosphere
(C) Only differential pressure
(D) Pressure difference between two points
18. A differential pressure transmitter is used to measure:
(A) Flow rate or level indirectly
(B) Temperature difference
(C) Absolute pressure
(D) Voltage
19. The LVDT can be used in pressure measurement as:
(A) A displacement sensor connected to diaphragm
(B) A direct pressure sensor
(C) A voltage regulator
(D) A thermal converter
20. Flow rate is defined as:
(A) Volume or mass of fluid passing a point per unit time
(B) Velocity of the fluid
(C) Pressure per unit area
(D) Energy of the flow
21. A Venturi meter measures flow rate based on:
(A) Pressure difference between throat and inlet
(B) Temperature difference
(C) Electrical resistance
(D) Magnetic field strength
22. A orifice meter operates on the same principle as:
(A) Venturi meter
(B) Rotameter
(C) Turbine meter
(D) Ultrasonic flow meter
23. A rotameter measures flow rate based on:
(A) Variable area principle
(B) Pressure difference
(C) Temperature variation
(D) Ultrasonic waves
24. The float in a rotameter rises higher when:
(A) Flow rate increases
(B) Flow rate decreases
(C) Pressure drops
(D) Fluid density decreases
25. A turbine flow meter measures flow rate by:
(A) Rotational speed of a turbine
(B) Pressure difference
(C) Magnetic induction
(D) Capacitance change
26. A magnetic flow meter works on:
(A) Faraday’s law of electromagnetic induction
(B) Thermal conduction
(C) Pressure difference
(D) Resistance change
27. A Coriolis flow meter measures:
(A) Mass flow rate directly
(B) Volume flow rate
(C) Pressure difference
(D) Velocity
28. An ultrasonic flow meter measures flow by detecting:
(A) Time difference of ultrasonic signals
(B) Pressure variation
(C) Magnetic field
(D) Temperature change
29. A pitot tube is used for measuring:
(A) Flow velocity
(B) Pressure difference
(C) Temperature
(D) Level
30. The Reynolds number in fluid flow helps determine:
(A) Type of flow (laminar or turbulent)
(B) Fluid temperature
(C) Flow pressure
(D) Density of the fluid
31. In a thermal flow meter, the flow is measured by:
(A) Heat transfer caused by moving fluid
(B) Pressure difference
(C) Mechanical displacement
(D) Magnetic induction
32. A capacitance-type level sensor measures level based on:
(A) Change in capacitance with level
(B) Change in resistance
(C) Induced current
(D) Change in voltage directly
33. A piezoelectric transducer can be used for:
(A) Measuring dynamic pressure or vibration
(B) Measuring static temperature
(C) Measuring displacement directly
(D) Detecting magnetic field
34. The strain gauge can be used for indirect pressure measurement by:
(A) Measuring strain on a diaphragm or tube
(B) Measuring magnetic field
(C) Detecting light intensity
(D) Measuring temperature
35. Calibration of pressure instruments is performed using a:
(A) Dead-weight tester
(B) Tachometer
(C) Oscilloscope
(D) Potentiometer