BOILING MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

BOILING MULTIPLE

CHOICE QUESTIONS

(MCQ) WITH ANSWERS 

MCQ improves the clarity of the

subject. It increases he depth of

understanding. Then fundamentals

are easily applied in real life applications.

  1. Boiling is change of liquid to vapor phase on heating is at

(a)  Constant temperature

(b) Varying temperature

(c ) Varying pressure

(d) None

      ANS: (a)

  1. During boiling, heat absorbed is

  1. Sensible heat

  2. Latent heat

  3. Sensible & latent heat

  4. None

      ANS: (b)

  1. During boiling, heat absorbed is

  1. Small

  2. large

  3. Medium

  4. None

       ANS: (b)

  1. After boiling, the density

 (a) Remains as before boiling

(b) Changes by small value

     (c )Changes with large value

    (d) None

      ANS: (c )

  1. After boiling, the density

  1. Remains as before boiling

  2. Changes by small value

  3. Changes with large value

  4. None

      ANS: (c )

  1.   After boiling, the specific heat

    1. Remains as before boiling

    2. Changes by small value

    3. Changes with large value

    4. None

               ANS: (c )

  1. After boiling, the conductivity

    1. Remains as before boiling

    2. Changes by small value

    3. Changes with large value

    4. None

               ANS: (c )

  1. After boiling, the viscosity

                 a. Remains as before boiling

                  b. Changes by small value

                    c. Changes with large value

                      d. None

                 ANS: (c )

  1. The hot surface temperature is to

    1. Higher than liquid saturation temperature

    2. Lower than the liquid saturation temperature

    3. Higher or lower than liquid saturation temperature

    4. None

               ANS: b)

  1. Pool boiling involves

    1. Free convection

    2. Forced convection

    3. Free & forced convection

    4. None

               ANS: (a)

  1. In forced convection boiling, motion of the fluid is caused by a

    1. Motor

    2. Compressor

    3. Pump

    4. None

                ANS: (c )

  1. Sub-cooled boiling, the vapors reach

    1. Free surface

    2. Do not reach free surface

    3. Few vapors reach free surface

    4. None

               ANS:( b)

  1. In saturated boiling, the vapors escape the free surface

    1. No

    2. Yes

    3. Can’t say

    4. None

                ANS: (b)

  1. Excess temperature is the difference of

    1. Saturated vapor and liquid temperatures

    2. Hot surface & saturation temperatures

    3. 100C

    4. None

               ANS: (b)

  1. When excess temperature is less than 30C, there is

    1. Only free convection

    2. Only forced convection

    3. Free and forced convection

    4. None

                 ANS: (a)

  1. When excess temperature is less than 30C, there is

    1. Only free convection

    2. Only forced convection

    3. Free and forced convection

    4. None

               ANS: (a)

  1. When excess temperature is greater than 30C and less than 80C, there is

    1. Sub-cooled boiling

    2. Saturated boiling

    3. Sub-cooled + saturated boiling

    4. None

               ANS: (a)

  1. When excess temperature is greater than 80C and less than 500C there is

    1. Sub-cooled boiling

    2. Saturated boiling

    3. Sub-cooled & saturated boiling

    4. None

                ANS: (b)

  1. When excess temperature becomes around 600C, there comes

    1. Nucleate boiling ends & film boiling starts

    2. Sub-cooled boiling ends

    3. Nucleate and sub-cooled boiling ends

    4. None

                 ANS: (a)

  1. The point where nucleate boiling ends and film boiling starts is the

    1. Point of nucleate boiling

    2. Burnout point

    3. Can’t say

    4. None

                   ANS: (b)

  1. Point of critical heat flux is the point of

    1. Starting nucleate boiling

    2. Ending of nucleate boiling

    3. Starting & ending of nucleate boiling

    4. None

               ANS: (b)

  1. Critical heat flux is the

    1. Minimum heat flus in pool boiling

    2. Maximum heat flux in pool boiling

    3. Minimum & maximum heat flux in pool boiling

    4. None

                ANS: (b)

  1. At the start of film boiling

    1. Bubble formation is not there

    2. Low formation of bubbles

    3. Rapid formation of bubbles

    4. None

                ANS: ©

  1. During film boiling, heat flux

    1. Firstly   Heat flux increases

    2. Secondly   Heat flux decreases

    3. Thirdly    Heat flux is constant

    4. None

                ANS: (b)

  1. When excess temperature is >500C & < boiling becomes

    1. Stable film boiling

    2. Unstable film boiling

    3. Stable & unstable film boiling

    4. None

               ANS: (b)

  1. The value of critical heat flux for water is(a) 58 x 104 W/m2     

        (b)  58 x 105 W/m2

        (c ) 58 x 106 W/m2

        (d) None

         ANS: (c )

  1. In a more viscous fluid, bubble size

    1. Increases

    2. Decreases

    3. Constant

    4. None

                 ANS: (a)

  1. In a more viscous fluid, frequency of bubble formation

    1. Increases

    2. Decreases

    3. Constant

    4. None

              ANS: (b)

  1. Relation of free convection boiling is

    1. Firstly         Nu = C Gra Prb

    2. Secondly    Nu = C Gra Reb

    3. Thirdly        Nu = C Gra Stb

    4. None

               ANS: (a)

  1. Relation for nucleate boiling is

    1. Zuber equation

    2. Rosenhow equation

    3. Both Zuber & Rosenhow equations

    4. None

                 ANS: (b)

  1. Critical heat flux equation is by

    1. Rosenhow

    2. Zuber

    3. Can’t say

    4. None

               ANS: (b)

  1. Critical heat flux in pool boiling lies in

  • (a) First regime

  • (b) Second regime

  • (c) Third regime

  • (d) None

  • ANS: (c)

  1. Rate of heat transfer will be

  • (a) More in pool boiling than in flow boiling

  • (b) More in flow boiling than in Pool boiling

  • (c) Equal in pool and flow boiling

  • (d) None

  • ANS: (b)

  1. Boiling and condensation temperatures for any fluid are

  • (a) Equal

  • (b) Greater in boiling

  • (c) Less in boiling

  • (d) None

  • ANS: (a) 

https://www.mesubjects.net/wp-admin/post.php?post=2717&action=edit         Q. A. Boiling Cond

https://mesubjects.net/wp-admin/post.php?post=6455&action=edit                    MCQ Condensation