Free Printable ME 62 LE 1 Review 1

1.

The objective of a refrigerator is to

a)

absorb heat from the space

b)

maintain the space at a certain temperature by removing heat from it

c)

reject the heat towards the space

d)

maintain the space at a certain temperature by rejecting heat towards it

2.

The process in a compressor is always isentropic.

a)

True

b)

False

3.

At what pressure does the evaporator in SVCC operate if the temperatures at all states are given?

a)

Pressure at the compressor outlet

b)

Pressure at the evaporator inlet

c)

Saturation pressure of given temperature of the evaporator

d)

Pressure at evaporator outlet

4.

Ideally, in a cascaded refrigeration cycle, the pressure of the evaporator at the upper cycle is (a) than the pressure at the condenser cycle for the heat transfer to take place.

5.

If the process is a wet compression, the state of the refrigerant at the compressor outlet is ________.

a)

saturated vapor

b)

saturated liquid

c)

saturated mixture

d)

superheated vapor

6.

When there is an internal heat exchanger in the system, the efficiency is of the IHX is __________

a)

$\frac{h2-h1}{h5-h6}$

b)

$\frac{h1-h6}{h3-h2}$

c)

$\frac{h2-h1}{h4-h5}$

d)

$\frac{h3-h4}{h1-h6}$

7.

In a multi-pressure system, the _______ is/are conserved in the flash chamber.

a)

mass

b)

energy

c)

mass and energy

d)

none of the above

8.

When there are two or more compressors in the system, the COP of the system is ___________.

a)

$\frac{RC}{Wnet}$

b)

$\frac{RC}{W_{C1_{ }}+W_{C2}}$

c)

$\frac{W_{net}}{RC}$

d)

$\frac{RC}{W_{C1_{ }}+W_{C2}+...+W_{Cn}}$

9.

For the refrigerants to mix at a certain junction in the system, the pressure must be ________.

a)

higher for the liquid

b)

higher for the vapor

c)

equal

d)

does not matter

10.

What happens to the COP of the system if the working at very low temperatures?

a)

The COP increases.

b)

The COP decreases.

c)

The COP is not affected.

11.

The vapor entering the evaporator is the main element contributing to the refrigerating effect of the system.

a)

True

b)

False

12.

The goal of flash intercooling is to cool the vapor at the discharge of the low-stage compressor to ________.

a)

increase the RC

b)

decrease the specific work

c)

decrease the amount of vapor

d)

increase the HRR

13.

In a cascaded refrigeration system, the COP is equal to _____.

a)

$\frac{q_{L,\ upper}+q_{lower}}{w_{net}}$

b)

$\frac{q_{L,\ upper}}{w_{upper}}$

c)

$\frac{q_{lower}}{w_{net}}$

d)

$\frac{q_{lower}}{w_{lower}}$

14.

Which should have a higher temperature at the condenser?

a)

refrigerant

b)

environment

c)

depends on the situation

d)

equal temperature

15.

The Brayton Refrigeration Cycle is better because

a)

it uses air as refrigerant

b)

it has a higher COP

c)

it is cheaper

d)

it can be an open cycle

16.

Compared to the SVCC, in the BRC we use the (a) to compute for the RC and the work done in the system.

17.

The process in a turbine in an ideal Brayton cycle is

a)

isentropic compression

b)

isentropic expansion

c)

isobaric expansion

d)

isobaric compression

18.

The efficiency of a power consuming equipment is

a)

ideal/actual

b)

actual/ideal

19.

The desired output in a refrigeration system is found at the (a) .

20.

Aside from high-temperature lift applications or lower temperature applications, multi-stage systems are also used when the refrigeration is requiring different temperatures. Which is/are multi-stage systems?

a)

Multi-compression systems

b)

Multi-evaporator systems

c)

Wet compression system

d)

Cascaded systems

e)

System with Internal Heat Exchanger

ME 62 LE 1 Review 1

Total questions: 20

Worksheet time: 29mins

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