mechanical engineering MCQs – Page 176

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 Review each marked answer and report any item that may be outdated or unclear.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

3501. Pour point of fuel oil is the____________________?
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A. storage temperature

B. lowest temperature at which oil will flow under set condition

C. temperature at which fuel is pumped through burners

D. none of the above

E. temperature at which oil is transported

3502. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
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A. may improve/worsen depending on size

B. improve C. worsen

C. unpredictable

D. remain unaffected

3503. Proximate analysis of fuel is determination of percentage of ____________________?
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A. carbon, hydrogen, nitrogen, sulphur, moisture

B. higher calorific value

C. fixed carbon, ash, volatile matter, moisture

D. rough analysis

E. lower calorific value

3504. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
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A. former is used for high installed capacity

B. former generates steam at high pressure

C. former occupies less space for same power

D. rate of steam flow is more in former case

E. chances of explosion are less in former case

3505. Fire tube boilers are limited to a maximum design working pressure of ____________________?
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A. 250 kg/cm2

B. 17 kg/cm2

C. 1 kg/cm

D. 6 kg/cm

E. 100 kg/cm2

3506. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
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A. same value

B. lower value

C. lower/higher depending on steam flow

D. higher value

E. unpredicatble

3507. 02 content in atmospheric air on volume basis is___________________?
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A. 70%

B. 23%

C. 30%

D. 40%

E. 21%

3508. If three forces acting in different planes can be represented by a triangle, these will be in________________?
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A. unpredictable

B. full equilibrium

C. partial equilibrium

D. none of the above

E. non-equilibrium

3509. According to principle of moments__________________?
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A. positive and negative couples can be balanced

B. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

C. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

D. none of the above

E. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

3510. Friction force for dry surfaces. Friction force is________________?
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A. k up wrong statement?

B. proportional to normal load between the surfaces

C. none of the above is wrong statement

D. independent of the area of contact surfaces

E. dependent on the materials of contact surface

F. proportional to velocity of sliding

3511. In ideal machines__________________?
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A. none of the above

B. mechanical advantage is unity

C. mechanical advantage is equal to velocity ratio

D. mechanical advantage is greater than velocity ratio

E. mechanical advantage is less than velocity ratio

3512. The unit of force in S.I. units is________________?
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A. watt

B. dyne

C. newton

D. joule

E. kilogram

3513. The necessary condition for forces to be in equilibrium is that these should be_________________?
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A. coplanar

B. meet at one point ;

C. both A. and B. above

D. all be equal

E. something else

3514. The unit of work or energy in S.I. units is_______________?
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A. pascal

B. kilogram meter

C. newton

D. watt

E. joule

3515. A number of forces acting at a point will be in equilibrium if_____________________?
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A. their total sum is zero

B. two resolved parts in two directions at right angles are equal

C. sum of resolved parts in any two per-pendicular directions are both zero

D. all of them are inclined equally

E. none of the above

3516. According to principle of transmissibility of forces, the effect of a force upon a body is_________________?
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A. maximum when it acts at the center of gravity of a body

B. minimum when it acts at the C.G. of the body

C. the same at every point in its line of action

D. different at different points in its line of action

E. none of the above

3517. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one___________________?
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A. parabola

B. hyperbola

C. circle

D. ellipse

E. none of the above

3518. The product of either force of couple with the arm of the couple is called_________________?
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A. resulting couple

B. none of the above

C. moment of the couple

D. moment of the forces

E. resultant couple

3519. The units of moment of inertia of an area are__________________?
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A. kg m2

B. kg/m4

C. kg/m2

D. m4

E. m3

3520. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to___________________?
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A. 500

B. 50

C. 250

D. 25

E. 100

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