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

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bratio of limiting friction and normal reaction

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

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dthe friction force acting when the body is in motion

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Which of the following is secondary fuel ?


aTh232andU238

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bU233andPu239

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cU233andPu238

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dnon of these

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View Answer U233andPu238

Pick up the wrong statement ?


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

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

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

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daxial flow compressors are bigger in diameter compared to centrifugal type

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Pick up the correct statement ?


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

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

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

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dall of the above

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Choose the correct statement ________________?


agas turbine requires lot of cooling water

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bgas turbine is capable of rapid start up and loading

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cgas turbines have flat efficiency at part loads

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dgas turbines have high standby losses and require lot of maintenance

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Pick up the correct statement?


aclosed cycle gas turbine is an I.C engine

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bgas turbine uses same working fluid over and over again

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

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dthrust in turbo-jet is produced by nozzle exit gases

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Which of the following statement is wrong ?


aThe mortise gauge has two scribing pins

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bThe gouges are chisels with a hollow shaped blade

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cAn auger is a planning tool

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dall of these

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Effect of a force on a body depends upon ________________?


amagnitude

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bdirection

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cposition or line of action

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dall of the above

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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

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bto replace them by a single force

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

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dto replace them by a couple

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


aabsolute temperature (T)

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bI2

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cf

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dt

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