03. Newton's Law of Cooling and Seebeck Effect
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Heat Transfer

149656 The thermo-emf (E) of a certain thermocouple is found to vary with temperature $t\left(\right.$ in ${ }^{\circ} \mathrm{C}$ ) in accordance with the relation:
$\mathbf{E}=\mathbf{4 0} \mathbf{t}-\frac{\mathbf{t}^{2}}{\mathbf{2 0}}$
Where $t$ is the temperature of the hot junction the cold junction being kept at $0^{\circ} \mathrm{C}$. The neutral temperature of the couple is

1 $100^{\circ} \mathrm{C}$
2 $200^{\circ} \mathrm{C}$
3 $300^{\circ} \mathrm{C}$
4 $400^{\circ} \mathrm{C}$
AP EAMCET(Medical)-2009
Heat Transfer

149635 The relation between Seebeck coefficient (s) and Peltier coefficient (a) is

1 $a=-T \frac{d^{2} E}{d T^{2}}$
2 $a=-T \frac{d E}{d T}$
3 $\frac{\mathrm{a}}{\mathrm{T}}=\frac{\mathrm{dE}}{\mathrm{dT}}$
4 $\frac{\mathrm{dE}}{\mathrm{dT}}=2 \mathrm{aT}$
J and K CET- 1998
Heat Transfer

149636 The effect which is related to the emf that develops when junctions of two different metals are kept at different temperatures is called the

1 Seebeck effect
2 Peltier effect
3 Thomson effect
4 Raman effect
J and K CET- 1997
Heat Transfer

149638 Hot water in vessel kept in a room, cools from $70^{\circ} \mathrm{C}$ to $65^{\circ} \mathrm{C}$ in $\mathrm{t}_{1}$ minutes, from $65^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in $t_{2}$ minutes time from $60^{\circ} \mathrm{C}$ to $55^{\circ} \mathrm{C}$ in $t_{3}$ minutes.
then,

1 $t_{1} \lt t_{2}>t_{3}$
2 $\mathrm{t}_{1}=\mathrm{t}_{2}=\mathrm{t}_{3}$
3 $t_{1}>t_{2}>t_{3}$
4 $t_{1}>t_{2}=t_{3}$
5 $\mathrm{t}_{1} \lt \mathrm{t}_{2} \lt \mathrm{t}_{3}$
Kerala CEE - 2015
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Heat Transfer

149656 The thermo-emf (E) of a certain thermocouple is found to vary with temperature $t\left(\right.$ in ${ }^{\circ} \mathrm{C}$ ) in accordance with the relation:
$\mathbf{E}=\mathbf{4 0} \mathbf{t}-\frac{\mathbf{t}^{2}}{\mathbf{2 0}}$
Where $t$ is the temperature of the hot junction the cold junction being kept at $0^{\circ} \mathrm{C}$. The neutral temperature of the couple is

1 $100^{\circ} \mathrm{C}$
2 $200^{\circ} \mathrm{C}$
3 $300^{\circ} \mathrm{C}$
4 $400^{\circ} \mathrm{C}$
AP EAMCET(Medical)-2009
Heat Transfer

149635 The relation between Seebeck coefficient (s) and Peltier coefficient (a) is

1 $a=-T \frac{d^{2} E}{d T^{2}}$
2 $a=-T \frac{d E}{d T}$
3 $\frac{\mathrm{a}}{\mathrm{T}}=\frac{\mathrm{dE}}{\mathrm{dT}}$
4 $\frac{\mathrm{dE}}{\mathrm{dT}}=2 \mathrm{aT}$
J and K CET- 1998
Heat Transfer

149636 The effect which is related to the emf that develops when junctions of two different metals are kept at different temperatures is called the

1 Seebeck effect
2 Peltier effect
3 Thomson effect
4 Raman effect
J and K CET- 1997
Heat Transfer

149638 Hot water in vessel kept in a room, cools from $70^{\circ} \mathrm{C}$ to $65^{\circ} \mathrm{C}$ in $\mathrm{t}_{1}$ minutes, from $65^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in $t_{2}$ minutes time from $60^{\circ} \mathrm{C}$ to $55^{\circ} \mathrm{C}$ in $t_{3}$ minutes.
then,

1 $t_{1} \lt t_{2}>t_{3}$
2 $\mathrm{t}_{1}=\mathrm{t}_{2}=\mathrm{t}_{3}$
3 $t_{1}>t_{2}>t_{3}$
4 $t_{1}>t_{2}=t_{3}$
5 $\mathrm{t}_{1} \lt \mathrm{t}_{2} \lt \mathrm{t}_{3}$
Kerala CEE - 2015
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Heat Transfer

149656 The thermo-emf (E) of a certain thermocouple is found to vary with temperature $t\left(\right.$ in ${ }^{\circ} \mathrm{C}$ ) in accordance with the relation:
$\mathbf{E}=\mathbf{4 0} \mathbf{t}-\frac{\mathbf{t}^{2}}{\mathbf{2 0}}$
Where $t$ is the temperature of the hot junction the cold junction being kept at $0^{\circ} \mathrm{C}$. The neutral temperature of the couple is

1 $100^{\circ} \mathrm{C}$
2 $200^{\circ} \mathrm{C}$
3 $300^{\circ} \mathrm{C}$
4 $400^{\circ} \mathrm{C}$
AP EAMCET(Medical)-2009
Heat Transfer

149635 The relation between Seebeck coefficient (s) and Peltier coefficient (a) is

1 $a=-T \frac{d^{2} E}{d T^{2}}$
2 $a=-T \frac{d E}{d T}$
3 $\frac{\mathrm{a}}{\mathrm{T}}=\frac{\mathrm{dE}}{\mathrm{dT}}$
4 $\frac{\mathrm{dE}}{\mathrm{dT}}=2 \mathrm{aT}$
J and K CET- 1998
Heat Transfer

149636 The effect which is related to the emf that develops when junctions of two different metals are kept at different temperatures is called the

1 Seebeck effect
2 Peltier effect
3 Thomson effect
4 Raman effect
J and K CET- 1997
Heat Transfer

149638 Hot water in vessel kept in a room, cools from $70^{\circ} \mathrm{C}$ to $65^{\circ} \mathrm{C}$ in $\mathrm{t}_{1}$ minutes, from $65^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in $t_{2}$ minutes time from $60^{\circ} \mathrm{C}$ to $55^{\circ} \mathrm{C}$ in $t_{3}$ minutes.
then,

1 $t_{1} \lt t_{2}>t_{3}$
2 $\mathrm{t}_{1}=\mathrm{t}_{2}=\mathrm{t}_{3}$
3 $t_{1}>t_{2}>t_{3}$
4 $t_{1}>t_{2}=t_{3}$
5 $\mathrm{t}_{1} \lt \mathrm{t}_{2} \lt \mathrm{t}_{3}$
Kerala CEE - 2015
Join With Us for More Updates
Heat Transfer

149656 The thermo-emf (E) of a certain thermocouple is found to vary with temperature $t\left(\right.$ in ${ }^{\circ} \mathrm{C}$ ) in accordance with the relation:
$\mathbf{E}=\mathbf{4 0} \mathbf{t}-\frac{\mathbf{t}^{2}}{\mathbf{2 0}}$
Where $t$ is the temperature of the hot junction the cold junction being kept at $0^{\circ} \mathrm{C}$. The neutral temperature of the couple is

1 $100^{\circ} \mathrm{C}$
2 $200^{\circ} \mathrm{C}$
3 $300^{\circ} \mathrm{C}$
4 $400^{\circ} \mathrm{C}$
AP EAMCET(Medical)-2009
Heat Transfer

149635 The relation between Seebeck coefficient (s) and Peltier coefficient (a) is

1 $a=-T \frac{d^{2} E}{d T^{2}}$
2 $a=-T \frac{d E}{d T}$
3 $\frac{\mathrm{a}}{\mathrm{T}}=\frac{\mathrm{dE}}{\mathrm{dT}}$
4 $\frac{\mathrm{dE}}{\mathrm{dT}}=2 \mathrm{aT}$
J and K CET- 1998
Heat Transfer

149636 The effect which is related to the emf that develops when junctions of two different metals are kept at different temperatures is called the

1 Seebeck effect
2 Peltier effect
3 Thomson effect
4 Raman effect
J and K CET- 1997
Heat Transfer

149638 Hot water in vessel kept in a room, cools from $70^{\circ} \mathrm{C}$ to $65^{\circ} \mathrm{C}$ in $\mathrm{t}_{1}$ minutes, from $65^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in $t_{2}$ minutes time from $60^{\circ} \mathrm{C}$ to $55^{\circ} \mathrm{C}$ in $t_{3}$ minutes.
then,

1 $t_{1} \lt t_{2}>t_{3}$
2 $\mathrm{t}_{1}=\mathrm{t}_{2}=\mathrm{t}_{3}$
3 $t_{1}>t_{2}>t_{3}$
4 $t_{1}>t_{2}=t_{3}$
5 $\mathrm{t}_{1} \lt \mathrm{t}_{2} \lt \mathrm{t}_{3}$
Kerala CEE - 2015
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