This set of Mechanical Operations Question Bank focuses on “Advantages and Disadvantages of Filter Press”.
1. _______ is a device where mechanical energy in the form of shaft work.
a) Turbomachine
b) Sonic boom
c) Compressor
d) Motor
View Answer
Explanation: A turbomachine is a device where mechanical energy in the form of shaft work, is transferred either to or from a continuously flowing fluid by the dynamic action of rotating blade rows.
2. _____ is a device which transmits power by converting it into thrust for propulsion.
a) Impellor
b) Propeller
c) Rotor
d) Shaft
View Answer
Explanation: A propeller is a device which transmits power by converting it into thrust for propulsion of a vehicle though a fluid by rotating two or more twisted blades about a central shaft.
3. _____ of a propeller act as rotating wings and produce force.
a) Blades
b) Wings
c) Fins
d) Ring assembly
View Answer
Explanation: The blades of a propeller act as rotating wings and produce force through application of Newton’s third law, generating a difference in pressure.
4. What does the below equation represent?
T= (m ∆V) ̇
a) Continuity equation
b) Thrust generated
c) Power required
d) Pressure
View Answer
Explanation: The following equation represents the thrust generated for a propeller, where m is the mass flow rate in kg/s and T is thrust in Newton’s.
5. What does the below equation following represent?
P=TV1
a) Continuity equation
b) Thrust generated
c) Power required
d) Pressure
View Answer
Explanation: The following equation represents the power required for a propeller, where P is the power in watts and V is the velocity in m/s.
6. _______ a propulsion arrangement, where by a propeller is mounted within a cylindrical shroud.
a) Boiler
b) Exhauster
c) Impellor
d) Ducted fan
View Answer
Explanation: A ducted fan is a propulsion arrangement, whereby a propeller is mounted within a cylindrical shroud or duct.
7. The ______ speed of an unshrouded propeller is limited since
a) Operating
b) Premium
c) Critical
d) Final
View Answer
Explanation: The operating speed of an unshrouded propeller is limited since tip speeds approach the sound barrier at lower speeds than an equivalent ducted propeller.
8. ______ are suitable for low specific speed, high pressure ratio per stage.
a) Centrifugal compressor
b) Axial compressor
c) Axial pump
d) Radial pump
View Answer
Explanation: Centrifugal compressors are suitable for low specific speed, high pressure ratio per stage and low mass flow rate applications.
9. Centrifugal compressor may have typical pressure ratio of about _______
a) 2:5
b) 5:1
c) 4:1
d) 7:5
View Answer
Explanation: Single stage centrifugal compressor may have typical pressure ratio of about 4:1, some test compressors are designed for pressure ratio up to 8:1.
10. For a radial turbine, high pressure gas passes through the volute increasing the ___
a) Potential energy
b) Kinetic energy
c) Power energy
d) Exhaust energy
View Answer
Explanation: High pressure gas passes through the volute, increasing its kinetic energy, the high velocity gas transfers its energy to the impeller shaft by flowing radially inward through the impeller.
Sanfoundry Global Education & Learning Series – Mechanical Operations.
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