RMO FINAL EXAM QUESTIONS AND
ANSWERS
1. A centrifugal compressor is in operation with suction stress is three PSIG and the
release is 10 PSI. What is the atmospheric strain is 14.7 that's the ratio closest too
A) 2.31
B) 2.35
C) 1.39
D) 0.89 - ANSWER-1.39
2. A centrifugal water pump is taken into consideration to be fully primed when
A) The pump is complete of air
B) Liquid or leaking beyond the packing gland
C) The pump runs and not using a knocking noise
D) The pump is full of liquid - ANSWER-The pump is complete of liquid
3. A centrifugal water pump is known as a boost pump whilst the
A) The pump lifts the water into the pump upon startup
B) The water deliver to the pump suction inlet is underneath the pump degree
C) The discharge head exceed one hundred fifty feet
D) The pump is began with the suction valve open - ANSWER-The water deliver to the
pump suction inlet is beneath pump level
4. A chill water machine uses refrigerant R134 a leak within the evaporator shell may
additionally bring about
A) Set off the refrigerant monitor alarm
B) Higher than normal excessive side strain
C) The foam of ice across the factor of leak
D) Low strain close down - ANSWER-Set off the refrigerant display alarm
5. A chilled water system has an air cooled condensing unit on a roof all through weather
has what kind of protection
A) Glycol strolling thru it
B) Heater coil
C) Air proscribing tool
D) Resistor - ANSWER-Air proscribing tool
6. A circuit breaker has a similar feature as what
A) Fuse
B) Solenoid
, C) Resistor
D) Relay - ANSWER-Fuse
7. A condenser pump is supplied with eighty five diploma water from a cooling tower and
returns to the tower at 88 tiers. Engineer is certain the condenser tubes are smooth and
freed from obstructions. The condenser has excessive condenser strain. The motive for
this may be
A) Over rate of refrigerant
B) Under price of refrigerant
C) Thermostat is damaged
D) Wide open water regulating valve - ANSWER-Over price of refrigerant
8. A facility has didn't maintain water remedy to a refrigerant gadget
A) Clogging of the cooling tower
B) Increase inside the condenser stress
C) Corrosion of the cooling metals
D) Cavitation of condenser water pumps - ANSWER-Increase in the condenser stress
9. A FDNY allow is needed to behavior warm works for
A) Brazing
B) Welding
C) Use of oxygen and flammable gasoline
D) All of the above - ANSWER-Use of oxygen and flammable fuel
10.A high-aspect float valve is used to maintain
A) Constant stage of refrigerant inside the evaporator
B) Constant price of refrigerant waft
C) Constant go with the flow of condenser water
D) Constant degree of refrigerant in condenser - ANSWER-Constant degree of
refrigerant in condenser
11.A low facet drift valve is used to maintain
A) Constant refrigerant glide
B) Water degree in cooling towers
C) Level of refrigerant within the condenser
D) Level of refrigerant in the evaporator - ANSWER-Level of the refrigerant in
theevaporator
12.A motor winding is touching the internal of the motor housing. This could result in
A) Motor might overheat and shutdown
B) Shock may additionally arise to employees
C) Motor might accelerate
D) Motor might slow down - ANSWER-Shock may also occur to personnel
,13.A multi-cylinder reciprocating compressor makes use of cylinder unloaders to modify
ability, what could now not arise if some of the unloaders fail to function while wanted
A) Chilled water temperature boom
B) Chilled water temperature lower
C) The evaporator temperature will be decreased
D) The discharge strain will increase - ANSWER-Chilled water temperature increases
14.A reciprocating compressor cylinder has a 10 inches bore and 14 inches stroke. The
extent of refrigerant, in cubic inches, could be towards
A) 1808
B) 1406
C) 1099
D) 1002 - ANSWER-1099
15.A reciprocating compressor is making a knocking sound for the duration of operation. If
the refrigerant worn parts are not inflicting the knocking what might be the cause
A) Misalignment of the compressor motor
B) The slugging of the liquid refrigerant
C) Parallel misalignment of the compressor and motor
D) Insufficient lubrication - ANSWER-The slugging of the liquid refrigerant
16.A refrigerant engineer is going for walks centrifugal water pumps in parallel. One of the
pumps is at maximum pumping rate. If by way of mistake, the refrigeration engineer
throttles returned on discharge valve of the opposite pump, the most probable effect will
be
A) A discount on the total go with the flow charge to the condenser
B) A discount in the water pressure at the condenser inlet
C) A discount in both the water flow charge and strain into the condenser
D) For the pumps components to maintain both the go with the flow fee and discharge
pressure - ANSWER-A reduction on the total flow charge to the condenser
17.A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following
the most in all likelihood reason for this condition is
A) A defective cooling tower water level controller
B) Operating at maintaining high hundreds
C) Too long a duration among pump servicing
D) Refrigerant leaks thru the pumps packing - ANSWER-A defective cooling tower
water stage controller
18.A refrigeration compressor has failed to turn on. The refrigeration engineer on obligation
verifies that the electric circuit to the motor, along with all switches and circuit breakers is
whole according to endorsed carrier exercise, the next object to be checked could
possibly be
, A) Temperature and stress controls
B) Liquid line solenoid valve
C) Refrigerant price
D) Cooling tower operation - ANSWER-Temperature and stress controls
19.A refrigeration engineer is logging reading from a reciprocating gadget. Compressor
discharge temperature have dropped considerably and the suction line strain is
excessive. Which of the subsequent may be inflicting this set of situation.
A) Compressor cycle
B) An enlargement valve that is wide open
C) Malfunction of a unloader
D) An enlargement valve that is closed to a good deal - ANSWER-An expansion valve
this is extensive open
20.A refrigeration engineer notices excessive biking of the temperature manipulate for a
reciprocating compressor refrigerant unit. The crankcase temperature is excessive, the
compressor discharge temperature is low, the suction line temperature is excessive. Of
the subsequent the only that can be inflicting this set of circumstance
21.
22.A) An growth valve that is open too huge
23.B) The purge unit operation
24.C) The condenser operation, dirty tubes of cooling manipulate
25.D) Faulty compressor valves - ANSWER-Faulty compressor valves
26.A refrigeration system makes use of jet ejector to elevate settled oil combined with
refrigerant to the oil pump if a limit inside the refrigerant float to the jet ejector develops
27.
28.A) The drift of oil might be unaffected
29.B) The temperature of the refrigerant exiting the jet will lower
30.C) The oil will now not lift if it's miles mixed with less refrigerant
31.D) There may be inadequate head to lift oil - ANSWER-There may be insufficient head
to boost the oil
32.A rooftop water cooling tower is connected to a water pump inside the constructing
basement with a 12 inches diameter pipe. With the pump flip off, a stress gauge at the
pumps inlet show a stress of 140 PSIG the height of the water column, in toes, would be
closet to
33.
34.A) 277
35.B) 375
36.C) 323
37.D) one hundred ninety - ANSWER-323
38.A single section 208 VAC circuit has 2 warm wires and the 0.33 is
39.
40.A) Spare twine
41.B) Ground
42.C) Control wire
ANSWERS
1. A centrifugal compressor is in operation with suction stress is three PSIG and the
release is 10 PSI. What is the atmospheric strain is 14.7 that's the ratio closest too
A) 2.31
B) 2.35
C) 1.39
D) 0.89 - ANSWER-1.39
2. A centrifugal water pump is taken into consideration to be fully primed when
A) The pump is complete of air
B) Liquid or leaking beyond the packing gland
C) The pump runs and not using a knocking noise
D) The pump is full of liquid - ANSWER-The pump is complete of liquid
3. A centrifugal water pump is known as a boost pump whilst the
A) The pump lifts the water into the pump upon startup
B) The water deliver to the pump suction inlet is underneath the pump degree
C) The discharge head exceed one hundred fifty feet
D) The pump is began with the suction valve open - ANSWER-The water deliver to the
pump suction inlet is beneath pump level
4. A chill water machine uses refrigerant R134 a leak within the evaporator shell may
additionally bring about
A) Set off the refrigerant monitor alarm
B) Higher than normal excessive side strain
C) The foam of ice across the factor of leak
D) Low strain close down - ANSWER-Set off the refrigerant display alarm
5. A chilled water system has an air cooled condensing unit on a roof all through weather
has what kind of protection
A) Glycol strolling thru it
B) Heater coil
C) Air proscribing tool
D) Resistor - ANSWER-Air proscribing tool
6. A circuit breaker has a similar feature as what
A) Fuse
B) Solenoid
, C) Resistor
D) Relay - ANSWER-Fuse
7. A condenser pump is supplied with eighty five diploma water from a cooling tower and
returns to the tower at 88 tiers. Engineer is certain the condenser tubes are smooth and
freed from obstructions. The condenser has excessive condenser strain. The motive for
this may be
A) Over rate of refrigerant
B) Under price of refrigerant
C) Thermostat is damaged
D) Wide open water regulating valve - ANSWER-Over price of refrigerant
8. A facility has didn't maintain water remedy to a refrigerant gadget
A) Clogging of the cooling tower
B) Increase inside the condenser stress
C) Corrosion of the cooling metals
D) Cavitation of condenser water pumps - ANSWER-Increase in the condenser stress
9. A FDNY allow is needed to behavior warm works for
A) Brazing
B) Welding
C) Use of oxygen and flammable gasoline
D) All of the above - ANSWER-Use of oxygen and flammable fuel
10.A high-aspect float valve is used to maintain
A) Constant stage of refrigerant inside the evaporator
B) Constant price of refrigerant waft
C) Constant go with the flow of condenser water
D) Constant degree of refrigerant in condenser - ANSWER-Constant degree of
refrigerant in condenser
11.A low facet drift valve is used to maintain
A) Constant refrigerant glide
B) Water degree in cooling towers
C) Level of refrigerant within the condenser
D) Level of refrigerant in the evaporator - ANSWER-Level of the refrigerant in
theevaporator
12.A motor winding is touching the internal of the motor housing. This could result in
A) Motor might overheat and shutdown
B) Shock may additionally arise to employees
C) Motor might accelerate
D) Motor might slow down - ANSWER-Shock may also occur to personnel
,13.A multi-cylinder reciprocating compressor makes use of cylinder unloaders to modify
ability, what could now not arise if some of the unloaders fail to function while wanted
A) Chilled water temperature boom
B) Chilled water temperature lower
C) The evaporator temperature will be decreased
D) The discharge strain will increase - ANSWER-Chilled water temperature increases
14.A reciprocating compressor cylinder has a 10 inches bore and 14 inches stroke. The
extent of refrigerant, in cubic inches, could be towards
A) 1808
B) 1406
C) 1099
D) 1002 - ANSWER-1099
15.A reciprocating compressor is making a knocking sound for the duration of operation. If
the refrigerant worn parts are not inflicting the knocking what might be the cause
A) Misalignment of the compressor motor
B) The slugging of the liquid refrigerant
C) Parallel misalignment of the compressor and motor
D) Insufficient lubrication - ANSWER-The slugging of the liquid refrigerant
16.A refrigerant engineer is going for walks centrifugal water pumps in parallel. One of the
pumps is at maximum pumping rate. If by way of mistake, the refrigeration engineer
throttles returned on discharge valve of the opposite pump, the most probable effect will
be
A) A discount on the total go with the flow charge to the condenser
B) A discount in the water pressure at the condenser inlet
C) A discount in both the water flow charge and strain into the condenser
D) For the pumps components to maintain both the go with the flow fee and discharge
pressure - ANSWER-A reduction on the total flow charge to the condenser
17.A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following
the most in all likelihood reason for this condition is
A) A defective cooling tower water level controller
B) Operating at maintaining high hundreds
C) Too long a duration among pump servicing
D) Refrigerant leaks thru the pumps packing - ANSWER-A defective cooling tower
water stage controller
18.A refrigeration compressor has failed to turn on. The refrigeration engineer on obligation
verifies that the electric circuit to the motor, along with all switches and circuit breakers is
whole according to endorsed carrier exercise, the next object to be checked could
possibly be
, A) Temperature and stress controls
B) Liquid line solenoid valve
C) Refrigerant price
D) Cooling tower operation - ANSWER-Temperature and stress controls
19.A refrigeration engineer is logging reading from a reciprocating gadget. Compressor
discharge temperature have dropped considerably and the suction line strain is
excessive. Which of the subsequent may be inflicting this set of situation.
A) Compressor cycle
B) An enlargement valve that is wide open
C) Malfunction of a unloader
D) An enlargement valve that is closed to a good deal - ANSWER-An expansion valve
this is extensive open
20.A refrigeration engineer notices excessive biking of the temperature manipulate for a
reciprocating compressor refrigerant unit. The crankcase temperature is excessive, the
compressor discharge temperature is low, the suction line temperature is excessive. Of
the subsequent the only that can be inflicting this set of circumstance
21.
22.A) An growth valve that is open too huge
23.B) The purge unit operation
24.C) The condenser operation, dirty tubes of cooling manipulate
25.D) Faulty compressor valves - ANSWER-Faulty compressor valves
26.A refrigeration system makes use of jet ejector to elevate settled oil combined with
refrigerant to the oil pump if a limit inside the refrigerant float to the jet ejector develops
27.
28.A) The drift of oil might be unaffected
29.B) The temperature of the refrigerant exiting the jet will lower
30.C) The oil will now not lift if it's miles mixed with less refrigerant
31.D) There may be inadequate head to lift oil - ANSWER-There may be insufficient head
to boost the oil
32.A rooftop water cooling tower is connected to a water pump inside the constructing
basement with a 12 inches diameter pipe. With the pump flip off, a stress gauge at the
pumps inlet show a stress of 140 PSIG the height of the water column, in toes, would be
closet to
33.
34.A) 277
35.B) 375
36.C) 323
37.D) one hundred ninety - ANSWER-323
38.A single section 208 VAC circuit has 2 warm wires and the 0.33 is
39.
40.A) Spare twine
41.B) Ground
42.C) Control wire
