30 Questions
What is the primary purpose of a revolution counter?
Speed
What is the main function of seismic transducers?
All of these
What does a DC tachometer measure?
Speed of shaft
In which direction(s) can a tachometer encoder measure displacement?
In both directions
How many outputs does a tachometer typically have?
All of these
What does the polarity of the output in a DC tachometer indicate?
Both a and b
What does an RVDT stand for?
Rotary variable differential Transformer
Which type of stress is not considered one of the basic types of stress?
Volumetric stress
What is the SI unit of speed?
m/s
How is speed defined?
All of these
What controls the speed of a DC motor?
Potentiometer
Into which energy signal does a position sensor convert the measured position in a servomechanism?
Electrical
In an ideal air compressor cycle with clearance on a p-v diagram, how can the cycle be represented in terms of processes?
Two adiabatic, one isobaric, and one constant volume
What happens to the thermal efficiency of a gas turbine for the optimum pressure ratio as the turbine inlet temperature increases?
Decreases
When the value of the index '«' is decreased, what typically happens to the volumetric efficiency of a compressor?
Decreases
If atmospheric pressure is 1.03 kg/cm² and the vapor pressure is 0.03 kg/cm², what would be the air pressure?
1.06 kg/cm²
Which advantage does an axial flow compressor have over a centrifugal compressor?
Larger air handling ability per unit frontal area
Which type of compressor does an axial flow compressor most closely resemble?
Centrifugal pump
In a fighter bomber, which type of engine is typically used?
Turbo-jet
For a compressor to do the least work, which type of compression would be ideal?
Isothermal
In a two-stage compressor, what happens to the optimum pressure if the compression index of the higher stage is greater than the lower stage?
Decrease
What is the maximum pressure ratio of an actual single-stage centrifugal compressor typically around?
01:10
In an irreversible gas turbine cycle, what factors do both efficiency and work ratio depend on?
Both pressure ratio and maximum cycle temperature
For a slow-speed large capacity compressor, which type of valve would be best suited?
Mechanical valve of the corliss, sleeve, rotary or semirotary type
Why is clearance volume essential in actual reciprocating compressors?
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
How is compression efficiency typically compared?
Isentropic compression
In a compressor, what should the cylinder clearance ideally be?
As small as possible
What is the primary purpose of a diffuser in a compressor?
Convert kinetic energy into pressure energy
During base load operation, the best method of controlling a compressor is through:
Constant speed unloader
How can the efficiency of a gas turbine be increased?
All of the above
Test your knowledge on measurement devices used for various purposes. Questions cover topics such as the rotary movement of a core, the use of stroboscope for measurements, and the functionality of a load cell. See how much you know about RVDT as well!
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