Shaft/rotor speed is most accurately measured by a_________________?

Related Mcqs:

1. Vibration upto 100 kilo hertz can be most accurately measured by a ________________ type accelerometer ?

   A. Preloaded spring
   B. Piezoelectric
   C. Bonded strain gauge
   D. None of these

2. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

   A. Δ H = 0 and ΔS = 0
   B. Δ H ≠ 0 and ΔS = 0
   C. Δ H ≠ 0 and ΔS ≠ 0
   D. Δ H = 0 and ΔS ≠ 0

3. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the____________________?

   A. Ability to absorb shock
   B. Capacity to store energy
   C. Ratio of the wire & coil diameters
   D. Load to produce unit deflection

4. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a _______________ calorimeter ?

   A. Bomb
   B. Throttling
   C. Junker’s
   D. Boy’s

5. Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?

   A. 580
   B. 640
   C. 1160
   D. Data insufficient; can’t be computed

6. The root mean square speed of molecules of a gas is equal to (where, m = mass of the molecule K = Boltzmann‟s constant, T = absolute temperature) ?

   A. √(2KT/m)
   B. √(3KT/m)
   C. √(6KT/m)
   D. 3KT/m

7. Water flow in the river during flood can be categorized as the _________________ flow ?

   A. Unsteady uniform
   B. Unsteady non-uniform
   C. Steady uniform
   D. Steady non-uniform

8. Fire in fuel gas pipelines is extinguished most effectively by _________________?

   A. Spraying water
   B. Blanketting the area with nitrogen atmosphere
   C. Fire fighting foam
   D. None of these

9. Drills are usually made of__________________?

   A. Cermets
   B. High speed steel
   C. Alloy steel
   D. Tungsten carbide

10. Material of construction of the electrode used in the electric resistance welding is___________________?

    A. Stainless steel
    B. Graphite
    C. Copper
    D. Steel