Question 1

HVDC transmission has-------------------as compared to HVAC transmission.

Accepted Answer

B

Question 2

The negative polarity is used in the monopolar link because it

Accepted Answer

Negative polarity is used in monopolar links because it produces less radio interference compared to positive polarity.

Question 3

Which of the following can be a source of supply in dc power supplies?

Accepted Answer

All of the mentioned options can be sources of supply in DC power supplies. A battery and a dry cell directly provide DC power, while a full wave rectifier converts AC power to DC power.

Question 4

Which of the application's filters used for?

Accepted Answer

Filters are primarily used for reducing ripples or unwanted frequencies from a signal, not for increasing them or altering phase change or amplitude directly.

Question 5

Which of the following represent a change of output voltage when load current is increased?

Accepted Answer

Load regulation refers to the ability of a power supply to maintain its output voltage despite changes in the load current. When the load current increases, the output voltage may change, and the measure of how well the power supply can maintain its output voltage under these conditions is known as load regulation.

Question 6

Which of the following generate output voltage much closer to true value?

Accepted Answer

Precision generators are designed to produce output voltages that are very close to the specified or true values, hence the term "precision."

Question 7

Why zener diodes are provided in dc supply?

Accepted Answer

Zener diodes are used in DC supply circuits to provide a stable reference voltage, as they can maintain a constant voltage across them when reverse-biased beyond their breakdown voltage.

Question 8

Stability of output voltage is entirely depended on

Accepted Answer

The stability of the output voltage in a voltage regulation circuit is primarily dependent on the stability of the zener diode. Zener diodes are used in voltage regulation circuits to maintain a constant output voltage despite variations in the input voltage or load conditions.

Question 9

For excellent stability, the zener diode is kept in temperature controlled casket.

Accepted Answer

The stability of a Zener diode, especially in terms of its voltage reference capability, can be significantly affected by temperature. Keeping it in a temperature-controlled environment minimizes temperature fluctuations, thereby enhancing its stability.

Question 10

For instrumentation system, precision variable voltage-reference system is necessary.

Accepted Answer

A precision variable voltage-reference system is necessary in instrumentation systems to ensure accurate and consistent measurements by providing a stable reference voltage.

Question 11

Which of the following can be used as a comparator?

Accepted Answer

The answer of Which of the following can be used...

Question 12

Which of the following are not the standard value of Zener diodes?

Accepted Answer

Zener diodes are manufactured in standard voltage values, and 5.8v is not a standard value among the options given. Standard Zener voltages include 5.1v, 5.6v, and 6.2v, among others.

Quiz 9: HVDC Transmission, DC Power Supplies, and Zener Diodes