ISRO Mechanical Exam: Theory of Machines Quiz

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Question 1

Figure shows a single degree of freedom system. The system consists of a massless rigid bar OP hinged at 0 and a mass m at end P. The natural frequency of vibration of the system is

• A
• B
• C
• D

Question 2

The rotor shaft of a large electric motor supported between short bearings at both the ends shows a deflection of 1.8 mm in the middle of the rotor. Assuming the rotor to be perfectly balanced and supported at knife edges at both the ends, the likely critical speed (in rpm) of the shaft is

• A350
• B705
• C2810
• D4430

Question 3

Which among the following is not related with flywheel?

• AIt is an energy storing device
• BIn this the energy is developed during power stroke
• CIt absorbs mechanical energy during the supply of energy
• DNone of above

Question 4

Which among the following information regarding the 4 bar mechanism is correct?

• AIf length of 4^th link of 4 bar mechanism is made infinite, then motion of C will be horizontal.
• BThe motion at C be obtained if 4^th link is changed by slider and guides are given for motion.
• CSlider-crank mechanism is a special case of 4-bar mechanism
• DAll of these

Question 5

Which one of the following is used to convert a rotational motion into a translational motion?

• ABevel gears
• BDouble helical gears
• CWorm gears
• DRack and pinion gears

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