A metal having a Poisson’s ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is________________?

Related Mcqs:

1. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is___________________?

   A. 0
   B. 0.33
   C. 0.44
   D. 0.25

2. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________?

   A. 1 : 1
   B. 1 : 2
   C. 2 : 1
   D. 1 : 4

3. ______________ circuit is most commonly used to measure strain with the help of a strain gauge?

   A. Ballast
   B. Voltage balancing potentiometric
   C. Simple current sensitive
   D. None of these

4. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?

   A. Steel
   B. Glass
   C. Rubber
   D. Brass

5. Strain hardening effect in a metal subjected to cold working is due to the ______________ mechanism?

   A. Fracture
   B. Dislocation
   C. Slip
   D. Twinning

6. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the_______________?

   A. Work hardening
   B. Bauschinger effect
   C. Creeping effect
   D. Stress recovery effect

7. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?

   A. Less
   B. More
   C. Equal
   D. Unpredictable

8. A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre?

   A. 0.01
   B. 0.1
   C. 0.25
   D. 0.5

9. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?

   A. x1.5
   B. x0.8
   C. x-1.5
   D. x-0.8

10. The maximum thickness of the metal which can be welded using ultrasonic welding is _____________ mm ?

    A. 0.5
    B. 3
    C. 10
    D. 25