Hot extrusion process is not used for making____________________?

Related Mcqs:

1. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?

   A. 349
   B. 651
   C. 667
   D. 1000

2. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?

   A. 100,000 kW
   B. 160,000 kW
   C. 200,000 kW
   D. 320,000 kW

3. Joule-Thomson effect i.e., a throttling process is a constant _____________ process?

   A. Entropy
   B. Temperature
   C. Internal energy
   D. Enthalpy

4. Isobaric process means a constant process ?

   A. Temperature
   B. Pressure
   C. Volume
   D. Entropy

5. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) ?

   A. Δ S1 is always Δ SR
   C. Δ S1 is always > Δ SR
   D. Δ S1 is always = Δ SR

6. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible _____________ process?

   A. Isobaric
   B. Isothermal
   C. Adiabatic
   D. None of these

7. Throttling process is a/an _____________ process?

   A. Reversible and isothermal
   B. Irreversible and constant enthalpy
   C. Reversible and constant entropy
   D. Reversible and constant enthalpy

8. In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?

   A. Adiabatic
   B. Reversible
   C. Isothermal
   D. None of these

9. Throttling (Joule-Thomson effect) process is a constant _____________ process?

   A. Enthalpy
   B. Entropy
   C. Pressure
   D. None of these

10. Isentropic process means a constant _____________________ process ?

    A. Enthalpy
    B. Pressure
    C. Entropy
    D. None of these