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# for a fin of finite length with an insulated end, the fin efficiency is given as

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## MCQs of Heat Transfer From Extended Surfaces (Heat Transfer

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### MCQs of

Showing 11 to 10 out of 20 Questions

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11.

“Fin is insulated at the tip”. What does that mean?

(a)

Less heat is transferred from the tip

(b)

The heat will be transferred from the tip only

(c)

More heat is transferred from the tip

(d)

No heat is transferred from the tip

12.

For an infinitely long fin, the efficiency of fin is given by

(a) 1/ml (b) 2/ml (c) 3/ml (d) 4/ml

13.

For a fin of finite length with an insulated end, the fin efficiency is given as

(a) tanh(ml) (b) tan(ml)/ml (c) tanh(m)/ml (d) tanh(ml)/ml

14.

On a heat transfer surface, fins are provided to

(a)

increases temperature gradient so as to enhance heat transfer

(b)

increase turbulence inflow for enhancing heat transfer

(c)

increase  surface area to promote the rate of heat transfer

(d)

decrease the pressure drop of the fluid

15.

Fins are made as thin as possible to

(a)

reduce the total weight

(b)

accommodate more number of fins

(c)

increase the width for the same profile area

(d)

improve the flow of coolant around the fin

16.

The temperate distribution (T-Ta)/(T0-Ta) for a fin with an insulated tip is given by

(a) e-mx (b) emx+e-mx2 (c) cosh m(l-x)cosh ml (d)

cosh m(l-x) + cosh ml

17.

The heat dissipation from an infinitely long fin is given by

(a) phk Ac (t0 - ta) (b)

phk Ac (t0 - ta) tanh ml

(c) hpl (t0 - ta) (d)

Phk Ac ( t0 - ta) tan ml (h/km)l +(h/km) tanh ml

18.

Provision of fins on a given heat transfer surface will be more effective if there are .............. number of ............. fins

(a) fewer, thick (b) large, thick (c) large, thin (d) fewer, thin

19.

An increase in convection coefficient over a fin

(a)

increases effectiveness

(b)

decreases effectiveness

(c)

does not influence the effectiveness

(d)

influences only the fin efficiency

20.

Fin efficiency is defined as the ratio of the heat transferred across an equal area held at

(a)

The temperature of fin end

(b)

constant temperature equal to that of base

(c)

the average temperature of fin

(d) none of the above

Showing 11 to 10 out of 20 Questions

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## Heat Transfer Test

This set of Heat Transfer test focuses on “Fin Performance”. 1. The utility of fin in dissipating a given quantity of heat is generally assessed on the basic of how many parameters? a) 1 b) 2 c) 3 d) 4 2. A copper steel rod (k = 55 W/m degree) has been attached to a ... Read more ## Heat Transfer Questions and Answers – Fin Performance

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This set of Heat Transfer test focuses on “Fin Performance”.

1. The utility of fin in dissipating a given quantity of heat is generally assessed on the basic of how many parameters?

a) 1 b) 2 c) 3 d) 4 View Answer

2. A copper steel rod (k = 55 W/m degree) has been attached to a plane wall which is maintained at a temperature of 350 degree Celsius. The rod is 8 cm long and has the cross-section of an equilateral triangle with each side 5 mm. Determine the heat dissipation from the rod if it is exposed to a convection environment at 25 degree Celsius with unit surface conductance 100 W/m2 degree. Consider end surface loss to be negligible

a) 10.26 W b) 9.26 W c) 8.26 W d) 7.26 W View Answer

3. For an infinitely long fin, the efficiency of fin is given by

a) 1/ml b) 2/ml c) 3/ml d) 4/ml View Answer

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4. For a fin of finite length with an insulated end, the fin efficiency is given as

a) tan h (ml) b) tan (ml)/ml c) tan h (m)/ml d) tan h (ml)/ml View Answer

5. For an infinitely long fin, the effectiveness of fin is given as

a) (P k/h AC) b) (P k/h AC)3/2 c) (P k/h AC)1/2 d) (P k/h AC)2 View Answer

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6. For a straight rectangular fin of thickness δ and width b, choose the correct option

a) P/AC = 1/ δ b) P/AC = 2/ δ c) P/AC = 3/ δ d) P/AC = 4/ δ View Answer

7. “Effectiveness of fin is the ratio of the fin heat dissipation with fin to that of no fin”.

8. Three fins of equal length and diameter but made of aluminum, brass and cast iron is heated to 200 degree Celsius at one end. If the fins dissipate heat to the surrounding air at 25 degree Celsius, the temperature at the free end will be least in

a) Brass fin b) Cast iron fin c) Aluminum fin

d) Each fin will have the same temperature

9. Two long rods A and B of the same diameter have thermal conductivities k and 4k and have one of their end inserted into a furnace at 400 K. At 9.5 m away section from the furnace, the temperature of rod B is120 degree Celsius. So find out at what end from the furnace end, the same temperature would be reached in the rod A?

10. The figure shows a 5 cm diameter rod, 90 cm long, which is having its lower face grinded smooth. The remainder of the rod is exposed to 32 degree Celsius room air and a surface coefficient heat transfer equal to 6.8 W/m2 degree exists between the rod surface and the room air. The grinder dissipates mechanical energy at the rate of 35 W. If thermal conductivity of rod material is 41.5 W/m degree, find the temperature of the rod at the point where the grinding is taking place a) 161.45 degree celsius

b) 151.45 degree celsius

c) 141.45 degree celsius

d) 131.45 degree celsius

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## For a fin of finite length with an insulated end, the fin efficiency is given as

For a fin of finite length with an insulated end, the fin efficiency is given as ( ... chapter Heat Transfer from Extended Surfaces of Heat Transfer

## For a fin of finite length with an insulated end, the fin efficiency is given as

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