FINS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
FINS MULTIPLE CHOICE QUESTIONS
(MCQ) WITH ANSWERS
MCQ on fins increases knowledge and
understanding. It increases the depth of
clarity. It is then easy to apply the
fundamentals in design and use of fins
in various practical applications.
Fig. Types of fins
Fig. Details of a Rectangular Fin
Fig. Different Cases of Fins
Fig. Heat lost by a fin
Fig. Temperature Variation in a fin

Fin increases the rate of heat transfer by increasing the
(a) Temperature difference
(b) Surface area
(c) Film coefficient
(d)None
Ans: (b)
2. The fin efficiency of infinite length is
(a)Infinity
(b) 100 %
(c) zero
(d) None
Ans: (c)
3. In case of a fin, q^{.}_{max} is
(a) hA_{c}(t_{b}–t_{a})
(b) hA_{s }(t_{b}–t_{a})
(c) kA_{c }Ət/Əx
(d) None
ANS: (b)
4. Efficiency of the fin is
(a) q^{. }_{with fin} / q^{. }_{without fin}
(b) q^{. }_{without fin}/ q^{. }_{with fin}
(c) q^{. }_{without fin}/ q^{. }_{max}
(d) None,
ANS: ©
5. Boundary conditions for a fin of infinite length are
(a) θ=θ_{0}=(t_{b}–t_{a}) at x=0 and θ=θ_{L}=(t_{b}–t_{a}) at x=L
(b) θ=θ_{0}=(t_{b}–t_{a}) at x=0 and θ=0 =(t_{b}–t_{a}) at x=∝
© θ=θ_{0}=(t_{b}–t_{a}) at x=0 and θ=θ_{∝}=t_{a} at x=∝
(d) None
ANS: (b)
6. Two boundary conditions for a fin of finite length with tip insulated are
(a) θ=θ_{0}=(t_{b}–t_{a}) at x=0 and θ=θ_{L}=(t_{b}–t_{a}) at x=L
(b) θ=θ_{0}=(t_{b}–t_{a}) at x=0 and θ=θ_{L}=t_{b} at x=L
© θ=θ_{0}=(t_{b}–t_{a}) at x=0 and Əθ/Əx =0 at x=L
(d) None
ANS: (c)
7. To increase the effectiveness of a fin, the film coefficient ‘h’ should be
(a) high
(b) less
(c) equal to 100
(d)None
ANS: (b)
8. Minimum effectiveness of a fin should be
(a) > (10)^{0.5}
(b) > (20)^{0.5}
(c) > (5)^{0.5}
(d) None
Ans: (c)
9.The relation between effectiveness and efficiency of a fin is
(a) η= ε A_{s}/A_{c}
(b) η= ε A_{c}/A_{s}
(c) ε = η A_{s}/A_{c}
(d) None
ANS: (b)

Efficiency for a fin of finite length with tip insulated is
(a) Cosh(mL)/mL,
(b) Sinh(mL)/mL
(c) Cosh(mL)/Sinh(mL)
(d) None
ANS: (d)
11. Which fluid is best on the outer surface of a fin
(a)Any fluid
(b) Liquid
(c) Gas
(d) None
ANS: (c)
12. Parameter ‘m’ of a fin is
(a) (k A_{c}/h P)^{0.5}
(b) (PA_{c}/hk)^{0.5}
(c) (hP/kA_{c})^{0.5}
(d) None
ANS: (c)
13. Temperature distribution in case of a fin of infinite length is
(a) linear
(b) Parabolic
(c) Exponential
(d) None
ANS: (c)
14. Effectiveness of a fin be
(a) <1
(b) =1
(c) >1
(d) None
ANS:(c)
15. What is the purpose of using fins in heat transfer?


Increase the rate of heat transfer

Decrease the rate of heat transfer

To maintain constant rate of heat transfer

None

Ans: (a)
16. Temperature at the fin tip of uniform cross section will be


Minimum

Maximum

Temperature of the base

None

Ans: (i)
17. In heat transfer through fins, the entire fin surface will be
(a) Same temperature
(b)Variable temperatures
(c)Base temperature
(d)None
Ans: (b)
18. Which analysis is the easiest among the three cases of the fins


Infinite length fin

Finite length fin with tip insulated

A fin of finite length

None

Ans: (a)
19. In which case the efficiency of the fin will be maximum

Infinite length fin

Fin of finite length with tip insulated

Finite length fin

None
Ans: (c)
https://www.mesubjects.net/wpadmin/post.php?post=2690&action=edit Q.A. Fins
https://mesubjects.net/wpadmin/post.php?post=289&action=edit FINS HEAT TRANSFER