1
GATE ME 2003
+1
-0.3
A $$2$$ $$kW,$$ $$40$$ liter water heater is switched on for $$20$$ minutes. The heat capacity $${C_p}$$ for water is $$4.2$$ $$kJ/kg$$ $$K.$$ Assuming all the electrical energy has gone into heating the water, increase of the water temperature in degree centigrade is
A
$$2.7$$
B
$$4.0$$
C
$$14.3$$
D
$$25.25$$
2
GATE ME 2000
+1
-0.3
A steam turbine receives steam steadily at $$10$$ $$bar$$ with an enthalpy of $$3000$$ $$kJ/kg$$ and discharges at $$1$$ bar with an enthalpy of $$2700$$ $$kJ/kg.$$ The work output is $$250$$ $$kJ/kg.$$ The changes in kinetic and potential energies are negligible. The heat transfer from the turbine casing to the surroundings is equal to
A
$$0$$ $$kJ$$
B
$$50$$ $$kJ$$
C
$$150$$ $$kJ$$
D
$$250$$ $$kJ$$
3
GATE ME 1999
+1
-0.3
A steel ball of mass $$1$$ $$kg$$ and specific heat $$0.4$$ $$kJ/kg$$ is at temperature of $${60^ \circ }C.$$ It is dropped into $$1$$ $$kg$$ water at $${20^ \circ }C.$$ The final steady state temperature of water is
A
$${23.5^ \circ }C.$$
B
$${30^ \circ }C.$$
C
$${35^ \circ }C.$$
D
$${40^ \circ }C.$$
4
GATE ME 1993
+1
-0.3
The first law of thermodynamics takes the form $$W = - \Delta \,H$$ when applied to :
A
A closed system undergoing a reversible adiabatic process.
B
An open system undergoing an adiabatic process with negligible changes in kinetic and potential energies.
C
A closed system undergoing a reversible constant volume process.
D
A closed system undergoing a reversible constant pressure process.
GATE ME Subjects
EXAM MAP
Medical
NEET