Showing posts with label MACHINE DESIGN. Show all posts
Showing posts with label MACHINE DESIGN. Show all posts

Que: In case of pressure vessels having open ends, the fluid pressure induces

(a) longitudinal stress 
(b) circumferential stress
(c) shear stress 
(d) none of these

પ્રશ્ન: પ્રેસર વેસલના ખુલ્લા છેડાના કિસ્સામાં, પ્રવાહી દબાણના તણાવની દિશા 
(a) સમાંતર તણાવ
(b) પરિધીય તણાવ
(c) કર્તનમાં તણાવ
(d) આમાંથી કંઈ નહિં

Ans: (b)

Que: A pressure vessel is said to be a thin cylindrical shell, if the ratio of the wall thickness of the shell to its diameter is

(a) equal to 1/10 
(b) less than 1/10
(c) more than 1/10 
(d) none of these

પ્રશ્ન: પાતળો નળાકાર શેલ એ પ્રેસર વેસલ  કહેવામાં આવે છે, જયારે  શેલમાં  દિવાલની જાડાઈ અને તેના વ્યાસનો ગુણોત્તર
(a) 1/ 10 બરાબર
(b) 1/10 કરતાં ઓછો 
(C) 1/10 કરતાં વધુ
(ડી) કોઈપણ નહિ 


Ans: (b)

Que: Stress and Strain Multiple choice question test.


Que: Machine Design consideration Multiple choice question test.


Que: Bending Stress general equation





M = Bending moment acting at the given section,
σ = Bending stress,
I = Moment of inertia of the cross-section about the neutral axis,
y = Distance from the neutral axis to the extreme fibre,
E = Young’s modulus of the material of the beam, and
R = Radius of curvature of the beam.





Que: The maximum shear stress developed in a beam of rectangular section is ........ the average shear stress.

(a) equal to 
(b) 4/3 times
(c) 1.5 times
 
પ્રશ્ન: મહત્તમ કર્તન દબાણમાં લંબચોરસ વિભાગમાં એક બીમમાં તણાવ સરેરાશ કર્તન દબાણમાં તણાવ કરતા_______ ગણો છે.
(a) સમાન
(b) 3/4 ગણું

(c) 1.5 ગણું

Ans: (c)


Induce Shear Stress due
 to shear force

Que: At the neutral axis of a beam, the shear stress is

(a) zero 
(b) maximum
(c) minimum

પ્રશ્ન: બીમની તટસ્થ ધરી પર, કર્તન દબાણમાં તણાવ
(a) શૂન્ય
(b) વધુમાં વધુ
(c) ન્યૂનતમ

   
Ans: (b)

Que: Guest’s theory is used for

(a) brittle materials 
(b) ductile materials
(c) elastic materials 
(d) plastic materials


પ્રશ્ન: ગેસ્ટ સિદ્ધાંત________માટે વપરાય છે 
(a) બ્રિટલ મટીરીયલ
(b) ડક્ટાઇલ મટીરીયલ
(c) ઇલાસ્ટિક મટીરીયલ
(d) પ્લાસ્ટિક મટીરીયલ


Ans: (b)

Que: Rankine’s theory is used for...

(a) brittle materials 
(b) ductile materials
(c) elastic materials 
(d) plastic materials

પ્રશ્ન: રેંકિન સિદ્ધાંત________માટે વપરાય છે

(a) બ્રિટલ મટીરીયલ
(b) ડક્ટાઇલ મટીરીયલ
(c) ઇલાસ્ટિક મટીરીયલ
(d) પ્લાસ્ટિક મટીરીયલ


Ans: (a)

Que: When a machine member is subjected to a tensile stress (σt) due to direct load or bending and a shear stress (τ) due to torsion, then the maximum shear stress induced in the member will be









Ans: (a)

Que: A solid shaft transmits a torque T. The allowable shear stress is τ. The diameter of the shaft is









Ans: (a)

Que: Two shafts under pure torsion are of identical length and identical weight and are made of same material. The shaft A is solid and the shaft B is hollow. We can say that

(a) shaft B is better than shaft A
(b) shaft A is better than shaft B
(c) both the shafts are equally good

પ્રશ્ન: શુદ્ધ ટોર્શન હેઠળ બે શાફ્ટ સમાન લંબાઈ અને સમાન વજનના છે અને તે જ સામગ્રીના બનેલા છે. શાફ્ટ A ઘન છે અને શાફ્ટ B હોલો છે. તો આપણે કહી સકિયે કે

(a) શાફ્ટ B એ શાફ્ટ A કરતાં વધુ સારો છે
(b) શાફ્ટ A શાફ્ટ B કરતાં વધુ સારો છે
(c) બંને શાફ્ટ સમાન છે

Ans: (a)

Que: If di and do are the inner and outer diameters of a hollow shaft, then its polar moment of inertia is









Ans: (a)

Que: If d = diameter of solid shaft and τ = permissible stress in shear for the shaft material, then torsional strength of shaft is written as









Ans: (c)

Que: The maximum bending stress, in a curved beam having symmetrical section, always occur, at the


(a) centroidal axis 
(b) neutral axis
(c) inside fibre 
(d) outside fibre

Ans: (c)

Que: The bending stress in a curved beam is


(a) zero at the centroidal axis 
(b) zero at the point other than centroidal axis
(c) maximum at the neutral axis 
(d) none of the above

Ans: (b)

Que: At the neutral axis of a beam,


(a) the layers are subjected to maximum bending stress
(b) the layers are subjected to tension 
(c) the layers are subjected to compression
(d) the layers do not undergo any strain

Ans: (d)

Que: The neutral axis of a beam is subjected to


(a) zero stress 
(b) maximum tensile stress
(c) maximum compressive stress 
(d) maximum shear stress

Ans: (a)

Que: The torsional shear stress on any cross-section normal to the axis is ......... the distance from the center of the axis.


(a) directly proportional to 
(b) inversely proportional to

Ans: (a)

Que: When a machine member is subjected to torsion, the torsional shear stress set up in the member is


(a) zero at both the centroidal axis and outer surface of the member
(b) Maximum at both the centroidal axis and outer surface of the member
(c) zero at the centroidal axis and maximum at the outer surface of the member
(d) none of the above

Ans: (b)