Telangana PSC Assistant Engineer Mechanical Paper 2020
A closed system is one which
(a) permits the passage of energy and matter across the boundaries.
(b) does not permits the passage of energy and matter across the boundaries.
(c) Permit the passage of energy across the boundary but does not permit the passage of matter
(d) permit the passage of matter the boundary but does not permit the passage of energy
A system undergoes a process in which the heat transfer to the system is 40 kJ and the work done by the system is 35000 Nm. The change in internal energy of the system is
(a) + 5 kJ
(b) – 5 kJ
(c) -10 kJ
(d) +10 kJ
Select the correct statement as per Charles’s law
(a) PV=Constant, if T is kept constant
(b) V/T=constant, if P is kept constant
(c) P/V=Constant, if T is kept constant
(d) T/p=Constant, if T is kept constant
The area under P-V diagram of any thermodynamic process represents
(a) Heat rejection
(b) Heat absorption
(c) Work done
(d) Heat supplied
A perfect gas at 27 degree C is heted at constant pressure so as to triple its volume. The final temperature of the gas will be
(a) 81 degree Celcius
(b) 270 degree Celcius
(c) 627 degree Celcius
(d) 900 degree Celcius
Calorific values of gaseous fuels is determined by
(a) Bomb Calorimeter
(b) Junker’s Calorimeter
(c) Separating Calorimeter
(d) Throttling Calorimeter
Otto cycle is also known as
(a) Constant pressure cycle
(b) Constant volume cycle
(c) Constant temperature cycle
(d) Constant temperature and pressure cycle
A Carnot engine working between 600 degree Kelvin and 300 degree Kelvin produces 200 kJ of work. The heat supplied is
(a) 200 kJ
(b) 400 kJ
(c) 2000 kJ
(d) 400 kJ
If the dryness fraction of steam (x) is less than ‘1’, then the steam is called as
(a) Dry steam
(b) Super heated steam
(c) Wet steam
(d) Both (a) and (b)
Which of the following is the boiler accessory?
(a) Blow-off cock
(b) Pressure gauge
(c) Water level indicator
(d) Economiser
A device is used to put-off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
(a) Bloww-off cock
(b) Stop valve
(c) Super heater
(d) Fusible plug
A steam nozzle converts
(a) heat energy of steam into kinetic energy
(b) kinetic energy into heat energy of steam
(c) potential energy into heat energy of steam
(d) Both (b) and (c)
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