mechanical engineering MCQs – Page 209

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 Review each marked answer and report any item that may be outdated or unclear.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

4161. According to fan laws, for fans having constant wheel diameter, the pressure varies________________?
0

A. square root of fan speed

B. directly as fan speed

C. square of fan speed

D. none of the above

E. cube of fan speed

4162. The specific speed of turbine is defined as the speed of a unit___________________?
0

A. of such a size that it delivers unit dis-charge at unit power

B. of such a size that it produces unit horse power with unit head

C. none of the above

D. of such a size that it requires unit power per unit head

E. of such a size that it delivers unit dis-charge at unit head

4163. Lancing is the operation of _________________?
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A. cutting a sheet of metal through part of its length and then bending the cut portion

B. cutting a sheet of metal in a straight line along the length

C. removal of metal to the desired shape from the edge of a plate

D. bending a sheet of metal along a curved axis

4164. A file removes the metal during___________________?
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A. both forward and return strokes

B. forward stroke

C. return stroke

D. none of these

4165. A neutral flame is obtained by supplying___________________?
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A. more volume of acetylene and less volume of oxygen

B. none of the above

C. more volume of oxygen and less volume of acetylene

D. equal volumes of oxygen and acetylene

4166. The shrinkage allowance for cast iron pattern is________________?
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A. 15 mm/m

B. 10 mm/m

C. 26 mm/m

D. 20 mm/m

4167. The operation of straightening a curved sheet metal, is known as____________________?
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A. coining

B. planishing

C. squeezing

D. drawing

4168. Tandem drawing of wires and tubes is necessary because_________________?
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A. annealing is needed between stages

B. it is not possible to reduce at one stage

C. accuracy in dimensions is not possible otherwise

D. surface finish improves after every drawing stage

4169. Which of the following statement is wrong ?
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A. all of these

B. The mortise gauge has two scribing pins

C. An auger is a planning tool

D. The gouges are chisels with a hollow shaped blade

4170. The cold working of metals is carried out_________________?
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A. at the recrystallisation temperature

B. below the recrystallisation temperature

C. above the recrystallisation temperature

D. at any temperature

4171. In a _____________ , both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram?
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A. progressive die

B. combination die

C. simple die

D. compound die

4172. In spot welding, the spacing between two spot weld should not be less than _______________?
0

A. 1.5d

B. d

C. 3d

D. 6d

4173. In vapour compression cycle, the conditii of refrigerant is saturated liquid________________?
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A. before entering the expansion valve

B. after passing through the expansion throttle valve

C. before entering the compressor

D. after passing through the condenser

E. before passing through the condensei

4174. Most of the domestic refrigerators work on the following refrigeration system _________________?
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A. vapour compression

B. electrolux refrigerator

C. dual cycle

D. carnot cycle

E. vapour absorption

4175. Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________?
0

A. 2-4 bars

B. 7-10 bars

C. 5-6 bars

D. atmospheric pressure

E. slightly above atmospheric pressure

4176. If a heat pump cycle operates between the condenser temperature of +27C and evaporator temperature of 23C, then the Carnot COP will be_________________?
0

A. 1.2

B. 6

C. 10

D. 0.2

E. 5

4177. Aqua ammonia is used as refrigerant in the following type of refrigeration system_________________?
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A. compression

B. direct

C. absorption

D. none of the above

E. indirect

4178. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is_____________________?
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A. there is no such consideration

B. pone of the above

C. more than or equal to 3.65 kg

D. less than 2 kg

E. more than 10 kg

4179. A refrigerant should have _____________________?
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A. Tow specific heat of liquid

B. low specific volume of vapour

C. k up the wrong statement ?

D. high latent heat of vaporisation

E. higher critical temperature

F. high boiling point

4180. One ton refrigeratiqn corresponds to_________________?
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A. 50 kcal/min

B. 80 kcal/min

C. 80 kcal/hr

D. 50 kcal/kr

E. 1000 kcal/day

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