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51.	What bearing is made use of in the horizontal shaft machines?(a) plain bearing(b) thrust bearing(c) push bearing(d) throw bearingI had been asked this question in an interview.Enquiry is from Bearings topic in section Aspects of Design of Mechanical Parts of Design of Electrical Machines
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52.	What happens in the case of the small shafts?(a) the diameter in the bearings should be about 1/3 of the maximum diameter(b) the diameter in the bearing should be about 2/3 of the maximum diameter(c) the diameter in the bearing should be about 2/5 of the maximum diameter(d) the diameter in the bearing should be about 1/5 of the maximum diameterI have been asked this question by my college director while I was bunking the class.I'd like to ask this question from Design of Shaft in section Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Right option is (B) the diameter in the BEARING should be about 2/3 of the MAXIMUM diameter The EXPLANATION: The diameter of the shaft in the bearings is less than the diameter under the armature. The diameter in the bearing should be 2/3 of the maximum diameter.

53.	What happens when the diameter under armature is 150 mm or above?(a) diameter of the shaft in bearing is 100 mm smaller than the maximum diameter(b) diameter of the shaft in bearing is 90 mm smaller than the maximum diameter(c) diameter of the shaft in bearing is 70 mm smaller than the maximum diameter(d) diameter of the shaft in bearing is 50 mm smaller than the maximum diameterThis question was addressed to me during an interview.This is a very interesting question from Design of Shaft topic in division Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Right option is (d) DIAMETER of the SHAFT in bearing is 50 MM smaller than the MAXIMUM diameter Easiest explanation: The diameter of the shaft in the bearings is less than the diameter under the armature. The diameter of the shaft in bearing is 50 mm smaller than the maximum diameter.

54.	What is the relation of the diameter of the shaft in the bearings to the diameter under the armature?(a) diameter of the shaft is very much greater than the diameter under the armature(b) diameter of the shaft is greater than the diameter under the armature(c) diameter of the shaft is equal to the diameter under the armature(d) diameter of the shaft is lesser than the diameter under the armatureThis question was posed to me in homework.Origin of the question is Design of Shaft in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Correct choice is (d) diameter of the shaft is LESSER than the diameter under the armature Easiest explanation: There are certain RULES in the DESIGN of the shaft. The diameter of the shaft in the BEARINGS is LESS than the diameter under the armature.

55.	What is the formula of the diameter of the shaft?(a) diameter of the shaft = 5.5 + (output in watt/rps)^1/3 mm(b) diameter of the shaft = 5.5 – (output in watt/rps)^1/3 mm(c) diameter of the shaft = 5.5 * (output in watt/rps)^1/3 mm(d) diameter of the shaft = 5.5 / (output in watt/rps)^1/3 mmThis question was posed to me during an online exam.This intriguing question originated from Design of Shaft topic in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Right OPTION is (c) diameter of the SHAFT = 5.5 * (output in watt/rps)^1/3 mm The explanation is: The output is FIRST calculated from the operation of the machine. Next, the tachogenerator is used to CALCULATE the SPEED of the machine and on the substitution of the values gives the diameter of the shaft.

56.	The critical speeds of rotation should be different from running speed of machine.(a) true(b) falseThis question was posed to me in an online interview.I would like to ask this question from Design of Shaft in chapter Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Correct choice is (a) true The explanation is: The CRITICAL speed RELATION is the THIRD property of the SHAFT design. The critical speeds of rotation should be different from the running speed of the MACHINE.

57.	What is the second property of the shaft design?(a) the shaft design should be such that it has high rigidity(b) the shaft design should be such that it should have high tensile strength(c) the shaft design should be such that it should have high corrosion resistance(d) the shaft design should be such that it should withstand voltage fluctuationsThe question was asked in my homework.I would like to ask this question from Design of Shaft topic in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Correct choice is (a) the shaft DESIGN should be such that it has high rigidity To ELABORATE: The second property of the shaft design such that it should have high rigidity. The rigidity should be such that the deflection of shaft under operation of machine does not reach such a DANGEROUS value as to cause the ROTOR to touch the STATOR.

58.	What should be the first property of the shaft design?(a) the shaft design should be such that the shaft must have enough corrosion resistance(b) the shaft design should be such that the shaft must have enough mechanical strength(c) the shaft design should be such that the shaft has enough tensile strength(d) the shaft design should be able to withstand the voltage fluctuationsThe question was posed to me in an interview for internship.Asked question is from Design of Shaft in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Correct option is (B) the SHAFT design should be such that the shaft MUST have enough mechanical strength The best I can explain: The shaft design should be such that the shaft must have enough mechanical strength. The strength should be such that it should WITHSTAND all LOADS without causing much residual strain.

59.	What is the meaning of stiffness?(a) ability to transmit the power(b) ability to withstand the weight of the rotor(c) ability to withstand unbalanced magnetic pull(d) ability to withstand the weight of rotor and unbalanced magnetic pullI have been asked this question during an online interview.I need to ask this question from Design of Shaft in section Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Right option is (d) ABILITY to withstand the WEIGHT of rotor and unbalanced magnetic PULL The EXPLANATION: The diameter of shaft for an electrical machine is determined by considerations of STIFFNESS. The stiffness is the ability to withstand the weight of rotor and unbalanced magnetic pull.

60.	What is the consideration for the determination of the diameter of shaft?(a) stiffness(b) voltage(c) current(d) rigidityI got this question during an interview.Enquiry is from Design of Shaft topic in portion Aspects of Design of Mechanical Parts of Design of Electrical Machines
Answer» Correct answer is (C) current Explanation: The MAIN aspect for the design of the DIAMETER of the SHAFT is the stiffness. The diameter of the shaft depends on the stiffness of the machine.