mechanical engineering MCQs – Page 89

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 Review each marked answer and report any item that may be outdated or unclear.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

1761. For measuring flow by a venturimeter, if should be installed in __________________?
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A. in any direction and in any location

B. vertical line

C. horizontal line

D. inclined line with flow downward

E. inclined line with upward flow

1762. Cobalt in steel __________________?
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A. improves cutting ability and reduce hardenability

B. refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

C. improves wear resistance, cuttinability and toughness

D. none of the above

E. gives ductility, toughness, tensile strength and anti corrosion property:

1763. The composition of silver solder is ___________________?
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A. silver, lead, tin

B. silver, copper, zinc

C. silver, tin, nickel

D. silver, lead, zinc

E. silver, copper, aluminium

1764. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be________________?
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A. wh

B. h/w

C. h

D. h/wh

E. w/h

1765. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________?
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A. hysteresis

B. creep

C. Boeschinger effect

D. inelasticity

E. visco elasticity

1766. The capillary rise at 20C in a clean glass tube of 1 mm bore containing water is approximately____________________?
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A. 20 mm

B. 1 mm

C. 10 mm

D. 5 mm

E. 30 mm

1767. Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
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A. 50 : 20 : 20 : 10

B. 40 : 30 : 20 : 10

C. 30 : 20 : 30 : 20

D. 50 : 20 : 10 : 20

E. 50 : 10 : 20 : 20

1768. DuraJomin contains___________________?
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A. 94% aluminium and 6% tin

B. 90% magnesium and 9% aluminium with some copper

C. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

D. 10% aluminium and 90% copper

E. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg

1769. If a refractory contains high content of silicon, it means refractory is__________________?
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A. acidic

B. brittle

C. neutral

D. basic

E. none of the above

1770. Operation of McLeod gauge used for low pressure measurement is based on the principle of_________________?
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A. Boyles law

B. McLeods law

C. Pascals law

D. Charles law

E. gas law

1771. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is___________________?
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A. 40 x 105 kg/cm2

B. 40 x 106 kg/cm2

C. 400 kg/cm2

D. 4000 kg/cm2

E. none of the above

1772. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?
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A. 30,000 kg

B. 13,500 kg

C. 27,000 kg

D. 18,000 kg

E. 9,000 kg

1773. Tungsten in high speed steel provides________________?
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A. sharp cutting edge

B. cold hardness

C. wear resistance

D. toughness

E. hot hardness

1774. Amorphous material is one___________________?
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A. in which atoms align themselves in a geometric pattern upon solidification

B. which is not attacked by phosphorous

C. which emits fumes on melting

D. in which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

E. none of the above

1775. The center of pressure of a surface subjected to fluid pressure is the point_______________?
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A. where pressure equivalent to hydraulic thrust will act

B. on the surface at which resultant pres-sure acts

C. at which all hydraulic forces meet

D. similar to metacentre

E. on the surface at which gravitational force acis

1776. Which of the following elements does not impart hardness to steel__________________?
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A. silicon

B. chromium

C. none of the above

D. nickel

E. copper

1777. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to________________?
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A. tan 9

B. cos 9

C. sin 9

D. cas 9

E. sin 9

1778. Hardness of lower bainite (tempered martensite) is about________________?
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A. RC 65

B. RC 32

C. RC 57

D. RC 48

E. RC 80

1779. White cast iron contains carbon in the form of__________________?
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A. free carbon

B. white carbon

C. graphite

D. cementite

E. ferrite

1780. Maximum percentage of carbon in ferrite is___________________?
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A. 0.06%

B. 0.8%.

C. 0.25%

D. 0.025%

E. 0.10%

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