**Points :**thermodynamic multiple choice question and answer, thermodynamic objective type question, mcqs 1. The unit of temperature is SI units is

a. Centigrade

b. Celsius

c. Fahrenheit

d.

**Kelvin**

e. Rankine

2. The unit of energy is SI units is

a. Watt

b.

**Joule**

c. Joule/sec

d. Joule/cm

e. Joule-m

3. 273°C if equal to

a. 0°K

b. 273°K

c.

**546°K**

d. 733°R

e. none of above

4. 200°F is equal to

(a) 93.33°C

(b) 660°R

(c) 366.33°K

(d)

**All of above**

(e) None of above

5. 540°R is equal to

a.

**300°K**

b. 340° K

c. 360°K

d. 390° K

(e) none of above

6. Temperature of a gas is produced due to

a. its heating value

b.

**kinetic energy of molecules**

c. repulsion of molecules

d. attraction of molecules

e. surface tension of molecule

7. In metric system of units (he unit of heat is

a. CHU

b. BTU

c.

**Kcal**

d. None of above

e. All of above

8. In S.I. system of units the unit

a.

**Joule**

b. ft-Ib

c. watt

d. none of above

d. all of above

9. In S.I. system of units the unit of energy is

a. N-m/sec

b. Joule/sec

c.

**watt**

d. all of above

e. none of above

10. In S.I. system of units the unit of power is

a. N-m/sec

b. Joule/sec

c. Watt

d.

**all of above**

e. none of above

11. The unit of pressure in S.I Units is

a. Kg/Cm

^{2}

b. mm of water column

c. Pascal

d.

**Torr**

e. bars

12 The internal energy of a system depends on

a. mass of the system

b. pressure of the system

c.

**temperature of the system**

d. volume of the system

e. none of above

13. One Fahrenheit degree is equal to

a. 5°C

b. 0°C

c. 1.8°C

d.

**-17.23°C**

e. -32°C

14. Atmospheric pressure is equal to

a. 1 Kg/Cm

^{2}

b.

**1.0332 Kg/cm**

^{2}c. 1.1 Kg/Cm

^{2}

d. 1.133 Kg/Cm

^{2}

e. 14.7 Kg/Cm

^{2}

15. The Statement that energy can neither be created nor destroyed but only converted from one form to another form is known a

a. Kinetic theory of gases

b. Zexoth law of thermodynamics

c.

**First law of thermodynamics**

d. Second law of thermodynamic

e. Boyle’s law

16. If ‘Q’ be the heat supplied to a system to do work ‘W’ with chance in internal energy of ∆U, then

a. ∆U = Q + W

b.

**Q = ∆U + W**

c. W = Q + ∆U

d. Q = ∆ / W

e. Q = W/U

17. Heat energy stored in a gas and used for raising temperature of a gas is known as

a. thermal energy

b.

**internal energy**

c. molecular energy

d. none of above

e. All of above

18. First law of thermodynamic furnishes the relationship between.

a.

**heat & work**

b. heat, work & properties of system

c. various properties of system

d. heat and internal energy

e. none of above

19. Which of the following variables controls the physical properties of a prefect gas.

a. Pressure

b. temperature

c. volume

d.

**all of above**

e. Pressure and temperature

20. The value of characteristic gas constant is

a. 287 J/Kg—°K

b. 0.287 KJ/Kg—°K

c. 29.27 Kg-m/Kg—°K

d.

**All of above**

e. None of above

21. According to charle’s law for a perfect gas

a. T

^{2}/T

^{1}= P

^{2}/P

^{1}, if V is kept constant

b.

**T**

^{2}/T^{1}= V^{2}/V^{1}, if P is kept constantc. Both (a) & (b) above

d. PT

^{2}/P

^{1}= V

^{1}/V

^{2}, if T is kept constant

e. pV/T = constant

22. Characteristic gas constant of a gas is equal to

a. Cp/Cv

b. Cv/Cp

c.

**Cp-Cv**

d. Cp + Cv

f. Cp x Cv

23. Specific heat of air at constant pressure CP is equal to

a. 0.17

b. 0.21

c.

**0.24**

d. 1.0

e. 1.41

24. The ratio of two specific heats of air is equal to

a. 0.17

b. 0.24

c. 01

d.

**1.41**

e. 2.71

25. Gases have

a. only one value of specific heat

b.

**two value of specific heat**

c. three valve of specific heat

d. no value of specific heat

e. some times one value some times two values of specific heat

26. Specific heat of air at constant volume is equal to

a.

**0.17**

b. 0.21

c. 0.24

d. 1.4

e. 2.3

27. The relationship between two specific heats Cp & Cv is given by

a.

**Cp/Cv =y**

b. Cp-Cv = R/J

c. CP-Cv = R

d. Cv-Cp =R/J

e. Cv+Cp = R/J

28. A perfect gas at 27°C is heated at constant pressure till its volume is doubled. The final temperature is

a. 54°C

b.

**327°C**

c. 108°C

d. 654°C

e. 600°C

29. Work done during constant volume process is

a.

**Zero**

b. 1

c. 100

d. p (V2-V1)

e. non of above

30. Isothermal process is one in which ____ remains constant

a. pressure

b.

**temperature**

c. volume

d. -pv

^{7}

e. None of above

31. The adiabatic Equation of a perfect gas is

a. pv = constant

b. pv

^{Î·}

c.

**pv**

^{Î³}= constantd.-pv

^{n-1/n}= Constant

32. A heat exchange process in which the product of preserver and volume remains constant is known as

a. heat exchange process

b. throttling process

c. adiabatic process

d. isentropic process

e.

**hyperbolic process**

33. The internal energy of a system is a function of only

a. pressure

b.

**temperature**

c. pressure and temperature

d. pressure volume and temperature

34. In an isothermal process, the internal energy of gas molecules

a. increases

b. decreases

c.

**remains constant**

d. may increase or decrease depending on the properties of gas

e. shows unpredictable behavior

35. In free expansion process

a. work done is zero

b. Heat transfer is zero

c.

**both (a) & (b) above**

d. work done is zero but heat increase

e. work done is zero but heat decrease

36. Otto cycle consists of following four processes.

a. two isothermal and two isentropic

b.

**two isentropic and two constant volumes**

c. two isentropic, one constant volume and one Constant pressure

d. two isentropic & two constant pressures

e. none of above

37 Diesel cycle consists of following four processes

a. two isothermal and two isotropic

b. two isentropic & two Constant volumes

c.

**Two isentropic, one constant volume & one constant pressure**

d. Two isentropic & two constant pressure

e. None of above

38. A petrol Engine theoretically operates on

a. constant volume cycle

b. constant pressure

c.

**constant temperature cycle**

d. none of above

39. A diesel engine operates on

a.

**constant pressure cycle**

b. constant volume cycle

c. constant temperature cycle

d. none of above

40. The working cycle is case of four-stroke engine is completed in the following number of revolutions of crankshaft.

a. ½

b. 1

c.

**2**

d. 8

41. The working cycle in case of two-stroke engine is completed in the following number of revolutions of crankshaft.

a. ½

b.

**1**

c. 2

d. 8

42. In diesel engine the fuel is ignited by

a.

**spark**

b. injected fuel

c. heat resulting from compressing air that is supplied for combustion

d. Igniter

e. combustion chamber

43. Number of spark plugs present in two-stroke diesel engine are

a.

**one**

b. two

c. three

d. four

e. none of above

44. An engine indicator is used to determine the following:

a. speed

b.

**temperature**

c. volume of cylinder

d. m.e.p & I.H.P.

e. B.H.P

45. The pressure and temperature t the end of compression stroke in a petrol engine are of the order of

a. 4-6 kg/cm

_{2}and 200-25.0°C

b. 12-20 Kg/cm

_{2}and 250-350°C

c. 12-20 Kg/cm

_{2}and 350-450°C

d.

**20-30 Kg/cm**

_{2}and 450-500°Ce. 30-40 Kg/cm

_{2}and 500-700°C

46. The pressure at the end of compression in case of diesel engine is of the order of

a.

**6 kg/cm**

_{2}b. 12 Kg/cm

_{2}

c. 20 Kg/Cm

_{2}

d. 28 Kg/cm

_{2}

e. 35 Kg/cm

_{2}

47. Which of the following is not an internal combustion engine.

a. 2-stroke petrol engine

b. 4-stroke petrol engine

c. diesel engine

d.

**steam turbine**

48. Engine pistons are usually made of aluminum alloy because it

a. is stronger

b. is higher

c. is wears less

d.

**absorbs shocks**

49. Diesel engine has - ports

a. 3

b. 2

c. 1

d. 4

e.

**no ports**

50. Open system usually encloses which of the following devices?

a. Compressor

b. Turbine

c. Nozzle

d.

**All of the above**

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