Видеотел

About this collection

Videotel questions are grouped by professional topic, including machinery, electrical equipment, fuel and ballast operations. Choose a subject relevant to your preparation.

“Видеотел” contains 764 questions across 16 collections.

Learning

Learning mode has no timer. After answering, you see feedback and the correct options. You can return to a question and repeat a topic.

Exam

A practice exam lasts up to 60 minutes and includes up to 50 questions from the selected collection. Correct answers and results appear after completion.

Sample questions and answers

These examples come from the published collection. Choose Learning to study questions in sequence, or Exam to check your knowledge.

On this commonly used electric pressure transmitter, how will you adjust the range ?

One correct answer

• 1) With item No. 1.
• 2) With item No. 2.
• 3) With item No. 5.
• 4) With item No. 7.✓ Correct answer

In a three-phase system why is a resistor fitted in series with the earth detection lights?

One correct answer

• 1) To limit the earth current.
• 2) To protect the earth lights.
• 3) To provide an easier path for the earth current.✓ Correct answer
• 4) To lower the voltage at the earth lights.

This drawing shows the structure of a .........

One correct answer

• 1) FET transistor.
• 2) diode.
• 3) bipolar transistor.✓ Correct answer
• 4) light activated SRC.

Which of these materials can be used to insulate magnetic flux ?

One correct answer

• 1) Ceramic.
• 2) Rubber.
• 3) None of these.✓ Correct answer
• 4) Porcelain.

What is the principle in which oil/water separation takes place in this cascade tank ?

One correct answer

• 1) By separation frames.
• 2) By directional change and centrifugal action in triple-action.✓ Correct answer
• 3) By acceleration through chambers.
• 4) By acceleration and gravitation.

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