Which type of balancing is performed at high speeds?
A - NSC Mechanical Technology Automotive - Question 4 - 2021 - Paper 1
Question 4
Which type of balancing is performed at high speeds?
A. Normal balancing
B. Static balancing
C. Dynamic balancing
D. Vibrational balancing
What is the function of t... show full transcript
Worked Solution & Example Answer:Which type of balancing is performed at high speeds?
A - NSC Mechanical Technology Automotive - Question 4 - 2021 - Paper 1
Step 1
Which type of balancing is performed at high speeds?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B. Static balancing. This method ensures that mass is evenly distributed on the wheel, reducing vibrations during high-speed rotations.
Step 2
What is the function of the turn-table while performing wheel alignment checks?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B. Allows the wheels to turn in and out with minimal resistance. This function is crucial for accurate wheel alignment adjustments.
Step 3
The camshaft rotation for the ignition of the air and fuel mixture in a four-stroke four-cylinder engine, occurs every ... degrees.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B. 360. In a four-stroke engine, the camshaft completes a full rotation every 360 degrees of crankshaft rotation.
Step 4
Which forced induction system has the most lag?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is A. Non-variable type turbocharger. This type typically takes longer to spool up, leading to increased lag.
Step 5
Indicated power can be defined as the ...
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is D. measure to determine the power developed by the burning fuel within the cylinder of an engine. This measures the engine’s output before losses are taken into account.
Step 6
A dynamometer measures the ...
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is A. theoretical power developed by the engine. This tool is essential for testing engine performance.
Step 7
Which of the following is the cause of high levels of hydrocarbon (HC) in an internal combustion engine?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is A. Too lean mixture. A lean air-fuel mixture can lead to incomplete combustion, resulting in higher HC emissions.
Step 8
What will cause a high oil pressure reading in an internal combustion engine?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is D. Viscosity of the oil is too thin. High oil viscosity can lead to elevated pressure readings.
Step 9
Which component in an automatic gearbox directs the oil pressure to select the required gear ratio?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is C. Control valve body. This part plays a critical role in controlling hydraulic pressure for gear selection.
Step 10
How is the lock-up clutch activated in a torque converter?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is A. By oil pressure. The activation of the lock-up clutch maximizes transmission efficiency.
Step 11
What is the cause of the tyre wear indicated in FIGURE 4.12 below?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is C. Unbalanced wheel. Uneven tyre wear often indicates issues with wheel balancing.
Step 12
Wheel alignment is performed on a motor vehicle to achieve ...
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is D. even tyre wear. Proper alignment helps prevent uneven wear on tyres.
Step 13
The function of a sensor in an engine-management system is to ...
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B. detect engine operating conditions. Sensors gather data essential for optimizing engine performance.
