mechanical engineering MCQs – Page 42

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 Review each marked answer and report any item that may be outdated or unclear.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

821. A chain comprises of 5 links having 5 joints. Is it kinematic chain ?
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A. yes

B. data are insufficient to determine it

C. no

D. it is a marginal case

E. unpredictable

822. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called___________________?
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A. hyperbolic expansion

B. throttling

C. adiabatic expansion

D. free expansion

E. parabolic expansion

823. Other method of reducing shock load in the above case can be_________________?
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A. other factors would decide same

B. to decrease length

C. unaffected by length

D. to increase length

E. none of the above

824. Angle of dwell of cam is defined as the angle________________?
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A. moved by the cam from a beginning of ascent to the termination of descent

B. during which the follower returns to its initial position

C. of rotation of the cam for definite displacement of the follower

D. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

E. through which the cam rotates during the period in which the follower remains in the highest position

825. The absolute acceleration of any point P in a link about center of rotation 0 is___________________?
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A. at 45 to PO

B. perpendicular to PO

C. none of the above

D. along OP

E. along PO

826. Otto cycle consists of following four processes____________________?
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A. two isentropics, one constant volume and one constant pressure

B. none of the above

C. two isentropics and two constant pres-sures

D. two isentropics and two constant volumes

E. two isothermals and two isentropics

827. Resilience of a material is important, when it is subjected to________________?
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A. shock loading

B. thermal stresses

C. wear and tear

D. fatigue

E. combined loading

828. Angular acceleration of a link can be determined by dividing the___________________?
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A. all of the above

B. centripetal component of acceleration with length of link

C. none of the above

D. resultant acceleration with length of link

E. tangential component of acceleration with length of link

829. An isolated system is one in which_____________________?
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A. mass does not cross boundaries of the system, though energy may do so

B. neither mass nor energy crosses the boundaries of the system

C. both energy and mass cross the boundaries of the system

D. mass crosses the boundary but not the energy

E. thermodynamic reactions do not occur

830. In a rigid link OA, velocity of A w.r.t. will be___________________?
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A. parallel to OA

B. perpendicular to OA

C. at 45 to OA

D. along AO

E. along OA

831. A gas is compressed in a cylinder by a movable piston to a volume one-half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be___________________?
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A. 30 Nm

B. 30,000 Nm

C. 300,000 Nm

D. 300 Nm

E. 3000 Nm

832. The direction of Coriolis component of acceleration is the direction _____________________?
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A. along tangential acceleration

B. along perpendicular to angular velocity

C. of relative velocity vector for the two coincident points rotated by 90 in the direction of the angular velocity of the rotation of the link

D. along the centripetal acceleration

E. none of the above.

833. If a system after undergoing a series of processes, returns to the initial state then__________________?
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A. process is executed in closed system cycle

B. sum of heat and work transfer will be zero

C. process is thermodynamically in equilibrium

D. no work will be done by the system

E. its entropy will change due to irreversibility

834. Which of the following cycles is not a reversible cycle_____________________?
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A. Ericsson

B. none of the above

C. Joule

D. Carnot

E. Stirling

835. Which of the following mechanisms produces mathematically an exact straight line motion____________________?
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A. Tchabichiff mechanism

B. Grasshopper mechanism

C. Watt mechanism

D. Peaucelliers mechanism

E. Ackermann mechanism

836. The energy of molecular motion appears as________________?
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A. potential energy

B. friction

C. increase in pressure

D. surface tension

E. heat

837. Which of the following processes are thermodynamically reversible___________________?
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A. hyperbolic and pV = C

B. isothermal and adiabatic

C. constant volume and constant pressure

D. throttling

E. free expansion

838. In an isothermal process, the internal energy of gas molecules________________?
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A. decreases

B. shows unpredictable behaviour

C. may increase/decrease depending on the properties of gas

D. increases

E. remains constant

839. In its simplest form, a cam mechanism consists of following number of links___________________?
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A. 3

B. 4

C. 2

D. 1

E. none

840. Which of the following laws is applicable for the behavior of a perfect gas__________________?
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A. Charleslaw

B. all of the above

C. Boyles law

D. Gay-Lussac law

E. Joules law

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