mechanical engineering MCQs – Page 207

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

4121. Head developed by a centrifugal pump depends on___________________?
0

A. A. and B. above

B. fluid density

C. impeller diameter

D. speed

E. type of casing

4122. Specific speed for reaction turbines ranges from___________________?
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A. 250 to 300

B. 10 to 100

C. none of the above

D. 80 to 200

E. 0 to 4.5

4123. In a centrifugal pump casing, the flow of water leaving the_______________?
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A. centrifugal

B. radial

C. rectilinear

D. vortex

E. radial

4124. A hydraulic accumulator normally consists of________________?
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A. special type of pump with storage device and a pressure regulator

B. two cylinders, two rams and a storage device

C. a cylinder, a piston, storage tank and control valve

D. a cylinder and a ram

E. two co-axial rams and two cylinders

4125. The optimum value of vane exit angle for a centrifugal pump impeller is_________________?
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A. 10-15

B. 30-40

C. 50-60

D. 20-25

E. 80-90.

4126. According to fan laws, at constant pressure, the speed capacity and power vary_________________?
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A. as square of density

B. as square root of density

C. inversely as density

D. inversely as square root of density

E. directly as the air or gas density

4127. Casting of a centrifugal pump is designed so as to minimize________________?
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A. loss of kinetic energy

B. cavitation

C. friction loss

D. starting time

E. static head

4128. Impulse turbine is generally fitted______________________?
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A. about 2.5 m above the tail race to avoid cavitation

B. about 2.5 m below the tail race to avoid cavitation

C. at the level of tail race

D. slightly below the tail race

E. little above the tail race

4129. According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?
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A. as square of density

B. inversely as density

C. as square root of density

D. directly as the air or gas density

E. inversely as square root of density

4130. According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?
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A. directly as fan speed

B. cube of fan speed

C. square of fan speed

D. none of the above

E. square root of fan speed

4131. The discharge through a reaction turbine with increase in unit speed____________________?
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A. first increases and then decreases

B. remains unaffected

C. increases

D. first decreases and then increases

E. decreases

4132. The hydraulic turbines are also known as : ___________?
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A. steam turbines

B. combustion turbines

C. water turbines

D. Gas turbines

4133. For very high discharge at low pressure such as for flood control and irrigation applications, following type of pump is preferred_________________?
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A. reciprocating

B. none of the above

C. centrifugal

D. mixed flow

E. axial flow

4134. Guide angle as per the aerofoil theory of Kaplan turbine blade design is defined as the angle between_________________?
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A. lift and tangential force

B. drag and resultant force

C. lift and resultant force

D. resultant force and tangential force

E. lift and drag

4135. Francis turbine is best suited for_____________________?
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A. medium head application from 24 to 180 m

B. all types of heads

C. low head installation up to 30 m

D. none of the above

E. high head installation above 180 m

4136. A turbine pump is basically a centrifugal pump equipped additionally with_________________?
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A. totally submerged operation facility

B. inlet guide blades

C. vaned diffusion casing

D. adjustable blades

E. backward curved blades

4137. Low specific speed of turbine implies it is__________________?
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A. propeller turbine

B. none of the above

C. any one of the above

D. Francis turbine

E. impulse turbine

4138. The maximum number of jets generally employed in impulse turbine without jet interference is________________?
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A. 16

B. 4

C. 6

D. 8

E. 12

4139. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
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A. same quantity of liquid

B. none of the above

C. 1.5 Q

D. 0.75 Q

E. Q/0.75

4140. Medium specific speea of turbine implies it is___________________?
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A. none of the above

B. propeller turbine

C. Francis turbine

D. any one of the above

E. impulse turbine

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