6. Grashof number signifies the ratio of
   

1. 1. inertia force to viscous force
      

   
   
   

   2. buoyancy force to viscous force
      

   
   
   

   3. buoyancy force to inertia force
      

   
   
   

   4. inertia force to surface tension force

   
   
   

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1. View Hint View Answer Discuss in Forum

   Grashof number = inertia force ×	Buoyancy force
   	(viscous force)2

   
   
   

   Correct Option: B

   Grashof number = inertia force ×	Buoyancy force
   	(viscous force)2

   
   
   

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7. The ratio of momentum diffusivity (υ) to thermal diffusivity (α), is called
   

1. 1. Prandt number
      

   
   
   

   2. Nusselt number
      

   
   
   

   3. Biot number
      

   
   
   

   4. Lewis number

   
   
   

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1. View Hint View Answer Discuss in Forum

   Pr =	μCp	=	ρVCp	=	V	=	V
   	k		k		k / ρCp		α

   Correct Option: A

   Pr =	μCp	=	ρVCp	=	V	=	V
   	k		k		k / ρCp		α

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8. Match List-I with List-ll and select the correct answer using the code given below the lists:
   

   List-I	List-II
   A. Grashof number	1. Mass diffusion
   B. Schmidt number	2. Transient heat conduction
   C. Weber number	3. Free convection
   D. Fourier number	4. Forced convection
   	5. Surface tension
   	6. Radiation

   
   

1. 1. A - 4 , B - 2 , C - 3 , D - 5
      

   
   
   

   2. A - 3 , B - 1 , C - 5 , D - 2
      

   
   
   

   3. A - 5 , B - 1 , C - 2 , D - 4
      

   
   
   

   4. A - 1 , B - 2 , C - 5 , D - 4
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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9. The heat transfer coefficient h in w/m²K is
   

1. 1. 0.0
      

   
   
   

   2. 4.8
      

   
   
   

   3. 6
      

   
   
   

   4. 750
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   For convection Heat flux, q = h(T_f – T_i)
   

   q = kw		dT
   		dy			w

   
   = 0.6 × 1 × 10⁴ = 6000 W/m
   

   ∴ h =	q	=	6000	= 750 W /m2K
   	(Tf – Ti)		8

   Correct Option: D

   For convection Heat flux, q = h(T_f – T_i)
   

   q = kw		dT
   		dy			w

   
   = 0.6 × 1 × 10⁴ = 6000 W/m
   

   ∴ h =	q	=	6000	= 750 W /m2K
   	(Tf – Ti)		8

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10. Match the property with their units
    

    Property	Units
    A. Bulk modulus	1. W/s
    B. Thermal conductivity	2. N/m2
    C. Heat transfer coefficient	3. N/m3
    D. Heat flow rate	4. W
    	5. W/mK
    	6. W/m2K

    
    

1. 1. A - 1 , B - 2 , C - 6 , D - 5
      

   
   
   

   2. A - 2 , B - 5 , C - 6 , D - 1
      

   
   
   

   3. A - 2 , B - 6 , C - 4 , D - 1
      

   
   
   

   4. A - 1 , B - 5 , C - 3 , D - 2

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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