, Maryland Stationary Engineer's 1st Class Examination 4
(2026) | Questions & Verified Answers | Latest Update |
Graded A+
1. Why are pumps primed?
To protect the bearings
To keep pump lubricated
To wet the packing
To start the flow
2. In electrical measurements, Ohms are a measure of:
strength
resistance
pressure
alternating current
3. A volt is a measure of
current
random drift velocity
flow rate
potential difference
4. Describe the purpose of priming a pump and why water is commonly used
for this process.
Priming a pump is necessary to remove air and fill the pump with
liquid, and water is commonly used because it is readily available
and effective.
, Priming a pump is to increase pressure, and oil is used because it
lubricates the pump.
Priming a pump is to cool the system, and steam is used to achieve
this.
Priming a pump is to clean it, and air is used to blow out debris.
5. If a steam boiler is laid up for an extended period without a desiccant, what
potential issue could arise?
Corrosion
Overheating
Increased efficiency
Pressure buildup
6. Describe the significance of a volt in electrical systems and how it relates to
current and resistance.
A volt measures the total energy consumed by electrical devices.
A volt measures the resistance of a conductor in an electrical circuit.
A volt measures the amount of current flowing in a circuit.
A volt measures electric potential difference, which drives current
through a resistance according to Ohm's Law.
7. Describe the phenomenon of cavitation in pumps and its effect on
performance.
Cavitation occurs when the pressure in the pump drops below the
vapor pressure of the liquid, causing vapor bubbles to form and
collapse, which reduces output.
Cavitation refers to the electrical failure of the pump motor.
, Cavitation is when the pump overheats, leading to a decrease in
efficiency.
Cavitation is a result of mechanical wear in the pump components.
8. One kilowatt is equal to ?
1.34 hp
737.6 ft-lb/s
238.9 cal/s
All of the above
9. Describe how suction pressure affects the efficiency of a refrigeration system
in terms of horsepower per ton.
Lower suction pressure increases the efficiency of the refrigeration
system.
Higher suction pressure increases the horsepower needed for the
system.
Suction pressure has no impact on horsepower per ton.
Higher suction pressure generally leads to lower horsepower per
ton of refrigeration required.
10. Describe the significance of a kilowatt-hour in the context of energy
consumption.
A kilowatt-hour is a measure of the maximum power a device can
handle.
A kilowatt-hour is used to measure the speed of electrical devices.
A kilowatt-hour represents the amount of energy consumed when a
device uses one kilowatt of power for one hour, which helps in
(2026) | Questions & Verified Answers | Latest Update |
Graded A+
1. Why are pumps primed?
To protect the bearings
To keep pump lubricated
To wet the packing
To start the flow
2. In electrical measurements, Ohms are a measure of:
strength
resistance
pressure
alternating current
3. A volt is a measure of
current
random drift velocity
flow rate
potential difference
4. Describe the purpose of priming a pump and why water is commonly used
for this process.
Priming a pump is necessary to remove air and fill the pump with
liquid, and water is commonly used because it is readily available
and effective.
, Priming a pump is to increase pressure, and oil is used because it
lubricates the pump.
Priming a pump is to cool the system, and steam is used to achieve
this.
Priming a pump is to clean it, and air is used to blow out debris.
5. If a steam boiler is laid up for an extended period without a desiccant, what
potential issue could arise?
Corrosion
Overheating
Increased efficiency
Pressure buildup
6. Describe the significance of a volt in electrical systems and how it relates to
current and resistance.
A volt measures the total energy consumed by electrical devices.
A volt measures the resistance of a conductor in an electrical circuit.
A volt measures the amount of current flowing in a circuit.
A volt measures electric potential difference, which drives current
through a resistance according to Ohm's Law.
7. Describe the phenomenon of cavitation in pumps and its effect on
performance.
Cavitation occurs when the pressure in the pump drops below the
vapor pressure of the liquid, causing vapor bubbles to form and
collapse, which reduces output.
Cavitation refers to the electrical failure of the pump motor.
, Cavitation is when the pump overheats, leading to a decrease in
efficiency.
Cavitation is a result of mechanical wear in the pump components.
8. One kilowatt is equal to ?
1.34 hp
737.6 ft-lb/s
238.9 cal/s
All of the above
9. Describe how suction pressure affects the efficiency of a refrigeration system
in terms of horsepower per ton.
Lower suction pressure increases the efficiency of the refrigeration
system.
Higher suction pressure increases the horsepower needed for the
system.
Suction pressure has no impact on horsepower per ton.
Higher suction pressure generally leads to lower horsepower per
ton of refrigeration required.
10. Describe the significance of a kilowatt-hour in the context of energy
consumption.
A kilowatt-hour is a measure of the maximum power a device can
handle.
A kilowatt-hour is used to measure the speed of electrical devices.
A kilowatt-hour represents the amount of energy consumed when a
device uses one kilowatt of power for one hour, which helps in
