mechanical engineering MCQs – Page 208

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 Review each marked answer and report any item that may be outdated or unclear.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

4141. Any change in load is adjusted by adjusting following parameter on turbine______________?
0

A. net head

B. relative velocity of flow at inlet

C. absolute velocity

D. flow

E. blade velocity

4142. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?
0

A. 39.2%

B. 68.80%

C. 91.6%.

D. 84.80%

E. 49.20%

4143. Air vessels in reciprocating pump are used to__________________?
0

A. reduce acceleration to minimum

B. save pump from cavitation

C. increase pump efficiency

D. smoothen flow

E. increase pump head

4144. Motion of a liquid in a volute casing of a centrifugal pump is an example of____________________?
0

A. spiral vortex flow

B. forced cylindrical vortex flow

C. rotational flow

D. radial

E. forced spiral vortex flow

4145. The efficiency of a centrifugal pump is maximum when its blades are__________________?
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A. bent backward first and then forward

B. bent backward

C. bent forward

D. straight

E. bent forward first and then backward

4146. One horsepower is equal to_________________?
0

A. 33000 watts

B. 736 watts

C. 102 watts

D. 550 watts

E. 75 watts

4147. A hydraulic intensifier normally consists of __________________?
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A. special type of pump with storage device and a pressure regulator

B. a cylinder and a ram

C. two co-axial rams and two cylinders

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

E. two cylinders, two rams and a storage device

4148. Low specific speed of a pump implies it is____________________?
0

A. centrifugal pump

B. none of the above

C. any one of the above

D. mixed flow pump

E. axial flow pump

4149. Reaction turbines are used for____________________?
0

A. high head

B. low head and high discharge

C. low head

D. high head and high discharge

E. high head and low discharge

4150. The angle of taper on draft tube is A. greater than 15 B. greater than 8 C. greater than 5 D. less than 8 E. less than 3.___________________?
0

A. greater than 5

B. less than 3.

C. angle of taper on draft tube is

D. less than 8

E. greater than 8

F. greater than 15

4151. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
0

A. trimming the impeller size to the required size by machining

B. designing new impeller

C. none of the above

D. not possible

E. some other alterations in the impeller

4152. For starting an axial flow pump, its delivery valve should be____________________?
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A. closed

B. partly open and partly closed

C. depends on starting condition and flow desired

D. could be either open or closed

E. open

4153. The flow rate in gear pump___________________?
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A. none of the above

B. decreases with increase in pressure

C. unpredictable

D. increases with increase in pressure

E. more or less remains constant with in-crease in pressure

4154. Medium specific speed of a pump implies it is_________________?
0

A. axial flow pump

B. any one of the above

C. mixed flow pump

D. centrifugal pump

E. none of the above

4155. The horse power required in above case will be___________________?
0

A. 0.75 B.H.P.

B. B.H.P./0.75

C. 1.5 B.H.P.

D. same

E. none of the above

4156. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?
0

A. 39.20%

B. 49.20%

C. 84.8%

D. 91.6%.

E. 68.80%

4157. Hydraulic accumulator is used for____________________?
0

A. accumulating hydraulic energy

B. supplying energy when main supply fails

C. accumulating oil

D. generally high pressures to operate hydraulic machines

E. supplying large quantities of oil for very short duration

4158. Runaway speed of a hydraulic turbine is_________________?
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A. the speed corresponding to maximum overload permissible

B. the speed at which turbine runner will be damaged

C. none of the above.

D. full load speed

E. the speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

4159. Francis, Kaplan and propeller turbines fall under the category of___________________?
0

A. Reaction-cum-impulse turbines

B. Mixed flow turbines

C. Reaction turbines

D. Impulse turbines

E. Axial flow turbines

4160. In a centrifugal pump, the liquid enters the pump__________________?
0

A. at the top

B. at the bottom

C. at the center

D. none of the above

E. from sides

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