The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased ___________________ times ?

Related Mcqs:

1. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be ______________ mm?

   A. 10
   B. 20
   C. 30
   D. 40

2. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?

   A. 50
   B. 100
   C. 150
   D. 200

3. 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

4. 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

5. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the _____________ joint ?

   A. Butt
   B. Lap
   C. Welded
   D. None of these

6. 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

7. Boiler tube size is specified by its thickness and _____________________ diameter ?

   A. Outside
   B. Inside
   C. Mean
   D. None of these

8. Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is ________________ mm?

   A. 15
   B. 25
   C. 10
   D. 30

9. Large diameter reinforced cement concrete (RCC) pipes are generally joined by ____________________ joint ?

   A. Flanged iron
   B. Collar
   C. Flexible
   D. Expansion

10. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

    A. 9,100
    B. 13,000
    C. 7,000
    D. 2,550