100+ Free Power Eng 4th Class 4B Practice Questions

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Sample Power Eng 4th Class 4B Practice Questions

Try these sample questions to test your Power Eng 4th Class 4B exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary function of a lubricant in a mechanical system?

A.To prevent any mechanical movement between parts

B.To reduce friction and wear between moving surfaces

C.To increase the operating temperature of the equipment

D.To act as a catalyst for chemical reactions

Explanation: The primary function of a lubricant is to reduce friction and wear between two moving surfaces by separating them with a thin film of oil or grease.

2Which property refers to a fluid's internal resistance to flow at a specific temperature?

A.Viscosity

B.Pour point

C.Flash point

D.Specific gravity

Explanation: Viscosity is the measure of a fluid's internal resistance to flow. It determines how easily the oil flows and how thick the lubricating film will be under operating conditions.

3What does a high Viscosity Index (VI) indicate about a lubricating oil?

A.The oil's viscosity changes significantly with temperature changes.

B.The oil has a very high flash point and is highly resistant to ignition.

C.The oil's viscosity changes relatively little with temperature changes.

D.The oil contains a high concentration of sodium soap thickeners.

Explanation: Viscosity Index (VI) is a measure of how much an oil's viscosity changes with temperature. A high VI indicates that the viscosity changes very little as temperature fluctuates, making it suitable for wide operating ranges.

4The lowest temperature at which a lubricating oil will flow or pour is known as the:

A.Cloud point

B.Pour point

C.Freezing point

D.Flash point

Explanation: The pour point is the lowest temperature at which a liquid lubricant will flow or pour under standard test conditions. It is a critical parameter for cold-weather operations.

5Which of the following is classified as a solid lubricant?

A.Silicon oil

B.Graphite

C.Lard oil

D.Sodium soap grease

Explanation: Graphite is a common solid lubricant. Solid lubricants are used in high-temperature or extreme-pressure applications where liquid oils or greases would break down or evaporate.

6What type of lubrication occurs when the moving surfaces are separated by a continuous, complete film of liquid lubricant?

A.Boundary lubrication

B.Solid lubrication

C.Hydrodynamic (fluid film) lubrication

D.Extreme pressure lubrication

Explanation: Hydrodynamic (fluid film) lubrication occurs when a continuous, complete film of lubricant completely separates the moving surfaces. This prevents metal-to-metal contact and minimizes friction.

7What is the main function of babbitt metal when used as a lining for journal bearings?

A.To increase the friction coefficient of the bearing

B.To provide a soft, conformable surface that embeds wear particles

C.To prevent the bearing from absorbing lubricating oil

D.To withstand temperatures exceeding 800 degrees Celsius

Explanation: Babbitt metal is a soft alloy (usually tin- or lead-based) used to line journal bearings. It is soft enough to conform to shaft misalignments and allow tiny foreign wear particles to become embedded in it, preventing shaft scoring.

8Which bearing type is specifically designed to handle loads that act along the axis of a rotating shaft?

A.Journal bearing

B.Radial bearing

C.Thrust bearing

D.Sleeve bearing

Explanation: Thrust bearings are designed to absorb forces that act along the axis of the shaft (axial loads). Examples include Kingsbury thrust bearings used in turbines.

9What is the purpose of oil grooves in a plain sleeve or journal bearing?

A.To reduce the overall weight of the bearing shell

B.To facilitate the escape of wear particles from the bearing assembly

C.To distribute lubricating oil evenly across the load-bearing area

D.To increase the running clearance of the shaft

Explanation: Oil grooves are machined into the bearing lining to distribute the lubricating oil evenly across the sliding surfaces, helping to establish and maintain a continuous lubricating film.

10A Kingsbury thrust bearing utilizes pivoting shoes to support axial loads. How does it maintain a lubricating oil film?

A.By using high-pressure external oil pumps to inject oil directly under the shoes

B.By allowing the pivoting shoes to tilt slightly and create a wedge-shaped oil film

C.By operating completely dry with self-lubricating Teflon coatings

D.By trapping a static pool of oil between the shoes that does not circulate

Explanation: A Kingsbury thrust bearing uses pivoting shoes that tilt slightly under load. As the thrust collar rotates, oil is drawn between the collar and the shoes, and the tilt creates a wedge-shaped oil film that supports the axial load hydrodynamically.

About the Power Eng 4th Class 4B Exam

This practice exam covers lubrication, pumps, compressors, steam turbines, electricity, and refrigeration for Part 4B of the SOPEEC 4th Class Power Engineer certification.

Assessment

100 multiple-choice questions

Time Limit

3.5 hours

Passing Score

65%

Exam Fee

Free (Standardization of Power Engineer Examinations Committee)

Power Eng 4th Class 4B Exam Content Outline

20%

Lubrication & Bearings

Lubricant properties, sliding/roller bearings, and lubrication systems.

20%

Pumps & Compressors

Reciprocating, centrifugal pumps, positive displacement compressors, and operations.

20%

Steam Turbines & Cooling Towers

Impulse/reaction turbines, governors, condensers, and cooling towers.

20%

Electricity & Instrumentation

AC/DC circuits, generators, motors, transformers, and control loops.

20%

Refrigeration & Heating Systems

Refrigeration cycles, ammonia systems, building HVAC, and humidifiers.

How to Pass the Power Eng 4th Class 4B Exam

What You Need to Know

Passing score: 65%
Assessment: 100 multiple-choice questions
Time limit: 3.5 hours
Exam fee: Free

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Frequently Asked Questions

What is the format of the Power Eng 4th Class 4B exam?

The exam consists of 100 multiple-choice questions covering all five content domains.

What is the passing score for the Power Eng 4th Class 4B exam?

Candidates must score at least 65% to pass the exam.

100+ Free Power Eng 4th Class 4B Practice Questions

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