GATE ME 1994 | Entropy and Irreversibility Question 26 | Thermodynamics

A $$1500$$ $$W$$ electrical heater is used to heat $$20$$ $$kg$$ of water $$\left( {{C_p} = 4186\,\,J/kg\,\,K} \right)$$ in an insulated bucket, from a temperature of $${30^{^0}}C$$ to $${80^{^0}}C$$. If the heater temperature is only infinitesimally larger than the water temperature during the process, the change in entropy for the heater is ________$$J/K$$ and for water _______$$J/K.$$

GATE ME 1994

Fill in the Blanks

-0

The slopes of constant volume and constant pressure lines in the $$T$$-$$s$$ diagram are ___________ and ___________respectively.

GATE ME 1993

MCQ (Single Correct Answer)

-0.3

Which among the following relations is/are valid ONLY for reversible process undergone by a pure substance?

$$\delta Q = dU + \delta W$$

$$T\,ds = dU + \delta W$$

$$T\,ds = dU + p\,dv$$

$$\delta Q = p\,dv + dU$$

GATE ME 1993

MCQ (Single Correct Answer)

-0.3

When a system executes an irreversible cycle:

$$\oint {{{\delta Q} \over T}} < 0$$

$$\oint {dS > 0} $$

$$\oint {dS = 0} $$

$$\oint {{{\delta Q} \over T}} > 0$$

Questions Asked from Marks 1

GATE ME 2014 Set 3 (1) GATE ME 2010 (1) GATE ME 2009 (1) GATE ME 2008 (1) GATE ME 2007 (1) GATE ME 1997 (2) GATE ME 1994 (2) GATE ME 1993 (2)

GATE ME Subjects

Engineering Mechanics

Machine Design

Strength of Materials

Heat Transfer

Production Engineering

Industrial Engineering

Turbo Machinery

Theory of Machines

Engineering Mathematics

Fluid Mechanics

Thermodynamics

General Aptitude