0% 1 Mechanical Engineering Quiz 27 1 / 50 Under-cooling in a refrigeration cycle_________________? other factors decide COP COP remains unaltered increases COP decreases COF 2 / 50 The speed of sound in a ideal gas varies directly as its__________________? pressure temperature absolute temperature density 3 / 50 A low unit cost can be obtained by following____________________? automatic material handling equipment specialisation of operation functional layout product layout 4 / 50 Compressive strength of grey cast iron in tonnes/cm is of the order of___________________? 15-Oct 10-Jul 7-May 5-Mar 5 / 50 A gas turbine used in air craft should have______________________? low weight and small frontal area small frontal area and high h.p. high h.p. and low weight high speed and high h.p. 6 / 50 The strap end of a connecting rod of steam engine is joined by_________________? sleeve and cotter joint gib of cotter joint knuckle joint spigot socket cotter joint 7 / 50 For reversible adiabatic process, change in entropy is_________________? minimum zero maximum unpredictable 8 / 50 The part of the coupling that actually transmits power and rotation from one shaft to the other shaft is_________? key hub gap driver 9 / 50 Cross head and guides form a _________________? sliding pair turning pair higher pair lower pair 10 / 50 In an immersed body, centre of pressure is __________________? could be above or below e.g. depend?ing on density of body and liquid at the centre of gravity above the centre of gravity below be centre of gravity 11 / 50 The value of COP in vapour compression cycle is usually__________________? always more than unity any one of the above always less than unity equal to unity 12 / 50 A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________? recrystallisation precipitation heat treatment allotropic change 13 / 50 Which of the following is a water tube boiler_________________? Babcock and Wilcox boiler Cornish boiler locomotive boiler Cochran boiler 14 / 50 The safety valve at superheater as compared to drum safety valve setting is set at___________________? same value lower value higher value any value 15 / 50 The torsional rigidity of a shaft is expressed by the_______________? elastic limit up to which it resists torsion, shear and bending stresses number of cycles it undergoes before failure maximum torque it can transmit torque required to produce a twist of one radian per unit length of shaft 16 / 50 The magnitude of tangential acceleration is equal to____________________? (velocity/crankradius) velocity x crank radius2 velocity2 x crank radius velocityvcrankradius 17 / 50 Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts__________________? applied mechanics theory of machines mechanisms kinetics 18 / 50 The high pressure boiler is oiie producing steam at a pressure more than_________________? 75-80 kg/cm2 atmospheric pressure 5 kg/cm2 10 kg/cm2 19 / 50 For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________? minimum and maximum zero and maximum maximum and zero zero and minimum 20 / 50 A big advantage of PERT over Gantt charts is that in the former case_________________? activities and events are clearly shown activity times are clear early start and late finish of an activity are clearly marked inter-relationship among activities is clearly shown 21 / 50 A tap bolt_____________________? has both the ends threaded has pointed threads has a head on one end and a nut fitted to the other has head at one end and other end fits into a tapped hole in the other part o be joined 22 / 50 According to law of triangle of forces __________________ ? three forces acting at a point can be represented by a triangle, each side being proportional to force three forces acting at a point will be in equilibrium if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two 23 / 50 For a kinematic chain to be considered as mechanism___________________? two links should be fixed there is no such criterion one link should be fixed none of the links should be fixed 24 / 50 The material commonly used for air craft gas turbine is__________________? Timken, Haste and Inconel allpys high alloy? steel stainless steel duralumin 25 / 50 Which of the following represents the allotropic forms of iron__________________? alpha iron, beta iron and gamma iron body centred cubic a-iron and face centred cubic a-iron alpha iron, gamma from and delta iron alpha iron and beta iron 26 / 50 If two moving elements have surface contact in motion, such pair is known as_________________? sliding pair rolling pair surface pair higher pair 27 / 50 In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about_______________? 100 xlOO5 joules lxlO5 joules 10 xlO5 joules 10 xlO5 kilo joules 28 / 50 With increase in load, convection superheater has_______________________? drooping characteristic none of the above flat characteristic rising characteristic 29 / 50 Superheating of steam is done at_________________? constant volume constant pressure constant entropy constant temperature 30 / 50 Measurement of temperature is based on_________________? thermodynamic properties first law of thermodynamics second law of thermodynamics zeroth law of thermodynamics 31 / 50 To reduce the possibility of knock in the C.I. engines, the first elements of fuel and air should have_______________? all of the above short delay high density high temperature 32 / 50 The combustion efficiency of a gas turbine using perfect combustion chamber is of the order of________________? 75% 85% 99% 50% 33 / 50 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___________________? 30 Nm 3000 Nm 300,000 Nm 300 Nm 34 / 50 In a centrifugal pump casing, the flow of water leaving the_______________? radial vortex radial centrifugal 35 / 50 Allowable pressure on high-pressure side or ammonia absorption system is of the order of_________________? 2-4 bars atmospheric pressure slightly above atmospheric pressure 5-6 bars 36 / 50 The air-fuel ratio in gas turbines is of the order of ______________________? 7:01 50:01:00 15:01 30:01:00 37 / 50 In the case of steady flow of a fluid, the acceleration of any fluid particle is________________? zero under limiting conditions constant variable zero 38 / 50 The units of moment of inertia of mass are ________________? kg/m2 kg/m kg m2 m4 39 / 50 TMU in method time measurement stands for__________________? time measurement unit time movement unit time motion unit technique measurement unit 40 / 50 The units of kinematic viscosity are____________________? kg sec/metre metres2 per sec newton-sec per metre newton-sec per metre 41 / 50 The objective of time study is to determine the time required to complete a job by_______________? new entrant average worker fast worker slow worker 42 / 50 The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________? same more less or more depending on operating conditions less 43 / 50 In a PERT chart___________________? only selected activities are numbered only important activities should be numbered only critical activities are numbered all activities should be numbered 44 / 50 An economiser in a boiler______________________? increases steam pressure decreases steam pressure decreases fuel consumption increases steam flow 45 / 50 The materials having same elastic properties in all directions are called________________? ideal materials uniform materials paractical materials isotropic materials 46 / 50 The presence of sulphur in pig iron makes__________________? it easily machinable it hard it brittle the casting unsound 47 / 50 The efficiency and work ratio of a gas turbine plant can be increased by _____________________? all of the above adding heat exchanger injecting water in/around combustion chamber using mulit-stage compressor with mfercooler 48 / 50 Pour point of fuel oil is the____________________? temperature at which oil is transported lowest temperature at which oil will flow under set condition storage temperature temperature at which fuel is pumped through burners 49 / 50 The weight per horse power ratio for gas. turbine as compared to I.C engine and steam turbine is________________? lower higher uncomparable same 50 / 50 PERT is the__________________? target oriented technique event oriented technique time oriented technique activity oriented technique Provide Your Information Your score is The average score is 74% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevMechanical Engineering Quiz 26 Mechanical Engineering Quiz 28Next
