B.TECH - Semester 3 thermodynamics Question Paper 2020 (feb)
Practice authentic previous year university questions for better exam preparation.
- When is a system said to be in thermodynamics equilibrium?
- At what temperature are the centrigrade and Fahrenheit readings identical?
- State the first law of thermodynamics as applied (a) for a cyclic process and (b) to non flow process.
- Define COP as applied to a carnot refrigerator and a carnot heat pump.
- Distinguish perpetual motion machine of kind one and second kind.
- State the Halmholtz function and Gibbs function.
- Why is specific heat at constant pressure always greater than specific heat at. constant volume for a gas?
- State Gibbs Dalton's law and Dalton's law of partial pressure.
- Distinguish between saturated and superheated steam.
- State the third law of thermodynamics. Where is it applied? Answer any one questions from each module. Each question carries 20 marks.
- State the steady flow energy equation. Elaborate on how can it be simplified to the forms applicable for (a) Nozzle and diffuser, (b) Turbine and compressor (c) Heat exchanger and (d) throttling device.
- (a) Through one point, there can pass only one reversible adiabatic Comment.
- A rigid and insulated tank of volume $1 m^{3}$ contains He at 100 kPa and 300 K . The tank is connected through a valve to a line carrying carbon dioxide at 400 kPa and 600 K . The valve is opened and the $C O_{2}$ enters the tank till the pressure inside the tank is 400 kPa . Then the value is clos...
- (a) Drive an expression for Joule Thomson coefficient interms of coefficient of thermal expansion and specific heat at constant pressure.
- (b) Using the equation $T d s=C_{v}\left(\frac{\partial T}{\partial p}\right) d p+C_{p}\left(\frac{\partial T}{\partial V}\right) d V$ Show that (i) $T d s=C_{v} d T+\left(\frac{\beta T}{k}\right) d V$ and (ii) $T d s=C_{p} d T-V \beta d p$.
- A large insulated vessel is divided into two chambers, one containing 5 kg of dry saturated steam at 0.2 Mps and the other 10 kg of steam, 0.8 quantity at 0.5 Mpa . If the partition between the chambers is removed and the steam is mixed thoroughly and allowed to settle, find the final pressure, stea...
- (b) Two reversible heat engines $A$ and $B$ are arranged in series, $A$ rejecting heat directly to B . Engine A received 200 kJ at a temperature of $421^{\circ} \mathrm{C}$ from a hot sources while engine B is in communication with a cold sink at a temperature of $4.4^{\circ} \mathrm{C}$. If the wor...
- Air expands through a turbine from $500 \mathrm{kPa}, 520^{\circ} \mathrm{C}$ to $100 \mathrm{kPa}, 300^{\circ} \mathrm{C}$. During expansion $10 \mathrm{~kJ} / \mathrm{kg}$ of heat is lost to the surroundings which is at $98 \mathrm{kPa}, 20^{\circ} \mathrm{C}$. Neglecting the K.E. and P.E. changes...
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