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Which one of them is a correct combination? 1) Boundary Lubrication i) Dimensionless film thickness < 1 2) Hydrodynamic Lubrication ii) Dimensionless film thickness lies between 1 and 3 3) Mixed Lubrication iii) Dimensionless film thickness lies between 3 and 5 4) Elastohydrodynamic Lubrication iv) Dimensionless film thickness is greater than 5
Consider the following statements in connection with thrust bearings: 1) Cylindrical thrust bearings have higher coefficient of friction than ball thrust bearings. 2) Taper rollers cannot be employed for thrust bearings. 3) Double-row thrust ball bearing is not possible 4) Lower race, outer race and retainer are readily separable in thrust bearings. Which of the above statements are correct?
Below a question is given with one passage and its effects (I) and (II). One of these effects or both or none may be the effect of the statement. Read both the effect and decide which of the following answer choice correctly depicts the relationship between these cause and effect. Passage: In the urban area there exist a lot of industries, commercial places and public places religious places which involve a lot of a  people and working machinery note of sound and when this sound becomes unpleasant it is known as noise. it is one of the reasons why public authorities have divided the city into a number of zones is known as a different noise level. Effects: I        Noise leads to emotional and behavioural stress. A person may feel disturbed in the presence of loud noise such as produced by heating of drums. II       Noise may cause damage to the liver, brain, and heart.  
Which of the following are the basic differences between vibration signature and noise signature? 1. Vibration signature is essentially in the frequency range zero to 100 cps whereas noise signature is in the range 20 cps to 3000 cps. 2. Vibration signature has well-defined peaks whereas the noise signal is smeared. 3. The intensities of noise signatures arc much less than that of vibration signatures. 4. Detection of vibration signature calls for a microphone whereas that of noise can do with a pickup. Select the correct answer using the code given below.
Ball bearings are preferred over other types of bearings for machines rated up to 75 kW. Which of the following is not true for ball bearings?
The objective of lubrication is to reduce dirt and girt that might have crept between the rubbing parts.
The objective of lubrication is to reduce friction between the parts having relative motion.
Which among the following is used between rails and sleepers to absorb shocks, resist lateral movement of rails and provide electrical insulation between rails?
Given below is a sentence which has been divided into four parts. The first part, which has been marked bold, is fixed in the sequence. The other three parts have been rearranged in the sequence and the four options give possible sequences of the three parts. Choose the option which gives the correct sequence of the rearranged parts. The state has received scanty rainfall/ which has also been explained as the cause of (A)/ floods in other parts of the country (B)/ and many people attribute this to climate change (C)
The objective of lubrication is to reduce the wear of the moving parts.