Thermodynamics
1)The value of ratio of the steam point temperature to the ice point temperature is?
- a) 1.466
- b) 1.266
- c) 1.166
- d) 1.366
View Answer d
2)Which of the following is chosen as the standard thermometric substance?
- a) Gas
- b) Liquid
- c) Solid
- d) All of the mentioned
Answer A
3)A real gas behaves as an ideal gas when?
- a) Temperature approaches zero
- b) Pressure approaches zero
- c) Both temperature and pressure approaches zero
- d) None of the
Answer B
4)In the equation dV=(1/p)dW, (1/p) is known as
- a) volume factor
- b) pressure factor
- c) differential factor
- d) integration factor
Answer D
5)For a two-stroke engine, work done in one minute is given by
- a) PmALN
- b) PmALN/2
- c) 2PmALN
- d) none of the mentioned
Answer A
6)The power available at crankshaft is always _____ indicated power.
- a) more
- b) less
- c) equal
- d) none of the mentioned
Ans-B
7)Mechanical efficiency of engine is given by
- a) IP/BP
- b) 1/(BP*IP)
- c) (BP*IP)
- d) BP/IP
Ans-D
8)Shaft work is given by
- a) T*ω
- b) T*dθ
- c) T*τ
- d) none of the mentioned
Ans-B
9)The surface tension acts to make the surface area of the liquid
- a) maximum
- b) minimum
- c) zero
- d) none of the mentioned
Ans-B
10)The transfer of heat between a wall and a fluid system in motion is called
- a) radiation
- b) convection
- c) conduction
- d) none of the mentioned
Ans-B
11)For solids and liquids, specific heat
- a) depends on the process
- b) is independent of the process
- c) may or may not depend on the process
- d) none of the mentioned
Ans-B
12)The value of constant of proportionality, J, has the value
- a) 1
- b) 0
- c) -1
- d) infinity
Ans-A
13)Which of the following is the first law for a closed system undergoing a cycle?
- a) ∫dW=∫dQ
- b) J∫dW=∫dQ
- c) ∫dW=J∫dQ
- d) none of the mentioned
Ans-C
14)(m*V*V)/2 gives the
- a) macroscopic kinetic energy
- b) microscopic kinetic energy
- c) macroscopic potential energy
- d) microscopic potential energy
Ans-B
15)m*g*z) gives the
- a) macroscopic kinetic energy
- b) microscopic kinetic energy
- c) macroscopic potential energy
- d) microscopic potential energy
Ans-C
16)The total internal energy of the system is given by
- a) U=N/ɛ
- b) U=Nɛ
- c) U=ɛ/N
- d) none of the mentioned
Ans-B
17)Which of the following is true in regard to the energy of an isolated system?
- a) dQ≠0
- b) dW≠0
- c) E=constant
- d) all of the mentioned
Ans-C
18)The limitation of the first law is
- a) does not indicate the possibility of a spontaneous process proceeding in a definite direction
- b) it assigns a quality to different forms of energy
- c) indicates the direction of any spontaneous process
- d) none of the mentioned
Ans-A
19)In a constant volume process, internal energy change is equal to
- a) heat transferred
- b) work done
- c) zero
- d) none of the mentioned
Ans-B
20)For an ideal gas, enthalpy becomes
- a) h=u-RT
- b) h=-u-RT
- c) h=u+RT
- d) h=-u+RT
Ans-C
21)Heat transferred at constant pressure _____ the enthalpy of a system.
- a) decreases
- b) increases
- c) first decreases then increases
- d) first increases then decreases
Ans-B
22)Total enthalpy of a system H is given by
- a) H=h/m
- b) H=m/h
- c) H=mh
- d) none of the mentioned
Ans-C
23)The enthalpy and internal energy are the function of temperature for
- a) all gases
- b) steam
- c) water
- d) ideal gas
Ans-D
24)The specific heat of a substance at constant volume is defined as the rate of change of ___ with respect to ___
- a) specific internal energy, temperature
- b) work, pressure
- c) specific internal energy, pressure
- d) heat, temperature
Ans-A
25)The specific heat of a substance at constant pressure is defined as the rate of change of ___ with respect to ___
- a) work, pressure
- b) enthalpy, temperature
- c) enthalpy, pressure
- d) heat, temperature
Ans-B