Related Mcqs:

1. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?

   A. Tempering
   B. Hardening
   C. Annealing
   D. Normalising

2. The approximate height of a blast furnace having a useful volume of 2000 m3 is about _______________ metres ?

   A. 25
   B. 35
   C. 55
   D. 75

3. Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________?

   A. Insulator for heat & electricity transmission
   B. Ferritic
   C. Behave like paramagnetic materials
   D. Superconductor

4. The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to _____________ °D ?

   A. 140
   B. 180
   C. 240
   D. 280

5. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) ?

   A. T
   B. 1/T
   C. T2
   D. 1/T2

6. Capacity & power requirement for an air compressor working at high altitude compared to sea-level will be_______________?

   A. More
   B. Less
   C. Same
   D. Either more or less; depends on the climatic conditions

7. Name the safety device used to protect the boiler, when the water level falls below a minimum level ?

   A. Blow down valve
   B. Blow off cock
   C. Fusible plug
   D. Safety valve

8. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by_________________?

   A. T1/(T1-T2)
   B. T2/(T1-T2)
   C. T1/T2
   D. T2/T1

9. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________?

   A. More
   B. Less
   C. Equal
   D. Much more

10. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________?

    A. Steel
    B. Glass wood
    C. Copper
    D. Fireclay bricks