What is the main cause of harmful vibrations in the machine? – McqOptions

MCQOPTIONS

1.	What is the main cause of harmful vibrations in the machine?
A.	Mechanically unbalanced rotor
B.	Bent or cracked shaft
C.	An excessively pulsating load
D.	All of these
E.	None of these
Answer» E. None of these

Discussion

No Comment Found

Related MCQs

<p> What is the usual rating of a synchronous induction motor?</p>
<p> What will be the rating of heater if the machine to be dried is less than 500 kW?</p>
<p> What designation is used for non sparking type of motor?</p>
<p> What is the minimum life span of a galvanised steel structure?</p>
<p> Which gel ensures the dryness of the incoming air in the breather?</p>
<p> On what type of bearing does the heavy power electrical machine rotate?</p>
<p> Which types of bearings are used for fractional HP motors? i. Sleeve bearing ii. Ball bearing iii. Roller bearing iv. Needle bearing</p>
<p> Which among these systems is an auxiliary plant in a power system?</p>
<p> Which type of insulation is preferred if the maximum temperature is 130°?</p>
<p> Which circuit among the following requires a supply of 48 V DC source?</p>