Free Printable Test 1

1.

A work of 2.5 kJ is delivered on a rod from a piston/cylinder where the air pressure is 500 kPa. What should be the diameter of the cylinder to restrict the rod motion to a maximum of 0.5 m?

a)

0.013 m

b)

0.113 m

c)

0.213 m

d)

0.313 m

2.

Shaft uses which kind of motion to do work?

a)

vertical motion

b)

horizontal motion

c)

rotational motion

d)

none of the mentioned

3.

A pot of steel (conductivity 50 W/m K), with a 5 mm thick bottom is filled with liquid water at 15°C. The pot has a radius of 10 cm and is now placed on a stove that delivers 250 W as heat transfer. Find the temperature on the outer pot bottom surface assuming the inner surface to be at 15°C.

a)

15.8°C

b)

16.8°C

c)

18.8°C

d)

19.8°C

4.

The black grille on the back of a refrigerator has a surface temperature of 35°C with a surface area of $1m^2$ . Heat transfer to the room air at 20°C takes place with convective heat transfer coefficient of $15W/Km^2$ . How much energy is removed during 15 minutes of operation?

a)

202.5 kJ

b)

212.5 kJ

c)

222.5 kJ

d)

232.5 kJ

5.

Which of the following is true?

a)

latent heat of fusion is not much affected by pressure

b)

latent heat of vaporization is highly sensitive to pressure

c)

both of the mentioned

d)

none of the mentioned

6.

Which of the following can be considered as the definition of energy?

a)

Q = ΔE + W

b)

Q - W = ΔE

c)

the first law of thermodynamics

d)

all of the mentioned

7.

For an adiabatic compressor or pump:

a)

The enthalpy of fluid remains constant with the amount of work input

b)

The enthalpy of fluid decreases by the amount of work input

c)

The enthalpy of fluid increases by the amount of work input

d)

none of the mentioned

8.

For charging a tank:

a)

Enthalpy is converted to work done

b)

Work done is converted to enthalpy

c)

Enthalpy is converted to internal energy

d)

Internal energy is converted to work done

9.

The piston/cylinder contains carbon dioxide at 300 kPa, with a volume of 0.2 m³ and at 100°C. Mass is added at such that the gas compresses with PV^1.2= constant to a final temperature of 200°C. Determine the work done during the process.

a)

-80.4 kJ

b)

-40.4 kJ

c)

-60.4 kJ

d)

-50.4 kJ

10.

Compressibility factor Z is given by.

a)

$\frac{RT}{pv}$

b)

$\frac{pv}{RT}$

c)

$\left(\frac{RT}{pv}\right)^2$

d)

$\left(\frac{pv}{RT}\right)^2$

11.

A piston-cylinder device initially contains air at 150 kPa and 27°C. At this stage, the volume is 400 litres. The mass of the piston is such that a 350 kPa pressure is required to move it. The air is now heated until its volume has doubled. Determine the final temperature.

a)

1400 K

b)

400 K

c)

500 K

d)

1500 K

12.

A system undergoing a change in state from A to B along path ‘X’ receives 100 J heat and does 40 J work. It returns to state A from B along path ‘Y’ with work input of 30 J. Calculate the heat transfer involved along the path ‘Y’.

a)

- 60 J

b)

60 J

c)

- 90 J

d)

90 J

13.

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 mentioned

14.

The power available at crankshaft is always _____ indicated power.

a)

more

b)

less

c)

equal

d)

none of the mentioned

15.

The function of a heat engine cycle is to _____ continuously at the expense of _____ to the system.

a)

heat input, produce work

b)

produce work, heat input

c)

can be both of the mentioned

d)

none of the mentioned

16.

A condenser must ____ and then ____ the compressed refrigerant.

a)

superheat, evaporate

b)

desuperheat, evaporate

c)

superheat, condense

d)

desuperheat, condense

17.

For an ideal gas, enthalpy becomes.

a)

$h=u-RT$

b)

$h=-u-RT$

c)

$h=u+RT$

d)

$h=-u+RT$

18.

Heat transferred at constant pressure _____ the enthalpy of a system.

a)

decreases

b)

increases

c)

first decreases then increase

d)

first increases then decrease

19.

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

20.

If a certain mass of steam is considered as the thermodynamic system, then the energy equation becomes

a)

$Q=ΔKE+ΔPE–ΔU+W$

b)

$Q=ΔKE+ΔPE–ΔU–W$

c)

$Q=-ΔKE–ΔPE+ΔU+W$

d)

$Q=ΔKE+ΔPE+ΔU+W$

Test 1

Total questions: 20

Worksheet time: 30mins

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