Mechanical Engineering MCQs

Page No. 148

Limiting force of friction is the__________________?


atangent of angle between normal-reaction and the resultant of normal reaction and limiting friction


bratio of limiting friction and normal reaction


cthe friction force acting when the body is just about to move


dthe friction force acting when the body is in motion



Which of the following is secondary fuel ?


aTh232andU238


bU233andPu239


cU233andPu238


dnon of these


View Answer U233andPu238

Pick up the wrong statement ?


acentrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities


bAxial flow compressors have a sub-stantially constant delivery at variable pressures


ccentrifugal compressors have a wider stable operating range than axial flow compressors


daxial flow compressors are bigger in diameter compared to centrifugal type



Pick up the correct statement ?


agas turbine uses low air-fuel ratio to economise on fuel


bgas turhine uses high air-fuel ratio to reduce outgoing temperature


cgas turbine uses low air-fuel ratio to develop the high thrust required


dall of the above



Choose the correct statement ________________?


agas turbine requires lot of cooling water


bgas turbine is capable of rapid start up and loading


cgas turbines have flat efficiency at part loads


dgas turbines have high standby losses and require lot of maintenance



Pick up the correct statement?


aclosed cycle gas turbine is an I.C engine


bgas turbine uses same working fluid over and over again


cair-fuel ratio in a gas turbine is 100 : 1


dthrust in turbo-jet is produced by nozzle exit gases



Which of the following statement is wrong ?


aThe mortise gauge has two scribing pins


bThe gouges are chisels with a hollow shaped blade


cAn auger is a planning tool


dall of these



Effect of a force on a body depends upon ________________?


amagnitude


bdirection


cposition or line of action


dall of the above


View Answer all of the above

If a number of forces act simultaneously on a particle, it is possible _____________________?


anot a replace them by a single force


bto replace them by a single force


cto replace them by a single force through C.G.


dto replace them by a couple



According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?


aabsolute temperature (T)


bI2


cf


dt



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