Muntaha Nasir ENGINEERING   -   Electrical Engineering

Which type of motor is known for its high starting torque and variable speed control?

DC motors provide high starting torque and are easily controlled for variable speed applications.
Muntaha Nasir ENGINEERING   -   Electrical Engineering

What is the primary function of a Zener diode in electronic circuits?

Zener diodes are used for voltage regulation, allowing current to flow in the reverse direction when a specific breakdown voltage is reached.
Muntaha Nasir ENGINEERING   -   Electrical Engineering

Which theorem states that any linear electrical network with multiple sources can be replaced by an equivalent single voltage source and a series resistor?

Thevenin's Theorem simplifies complex networks to a single voltage source and series resistance.
Muntaha Nasir ENGINEERING   -   Electrical Engineering

What is the main purpose of a transformer in electrical circuits?

Transformers are used to change the voltage levels in AC circuits, either stepping up or stepping down the voltage.
Tail Briz ENGINEERING   -   Electrical Engineering

In a DC generator, what is the function of the commutator?

The commutator in a DC generator converts the alternating voltage induced in the armature winding into direct current by reversing the direction of current flow in each armature coil as it rotates.
Tail Briz ENGINEERING   -   Electrical Engineering

In a separately excited DC motor, if the field winding is open-circuited while the armature winding is connected to a DC supply, what will happen to the motor speed?

In a separately excited DC motor, the speed is primarily controlled by the armature voltage. Opening the field winding circuit does not affect the armature voltage, so the motor speed remains unchanged.
Tail Briz ENGINEERING   -   Electrical Engineering

What is the primary purpose of using transformers in the transmission and distribution of electrical power?

Transformers are used in transmission and distribution systems to step up voltage for long-distance transmission to reduce losses and then step down voltage for distribution to end-users.
Tail Briz ENGINEERING   -   Electrical Engineering

A transformer has a turns ratio of 1:10. If the primary winding has 500 turns, how many turns are there in the secondary winding?

The turns ratio of 1:10 means that for every turn in the primary winding, there are 10 turns in the secondary winding. Therefore, if the primary winding has 500 turns, the secondary winding will have 500 x 10 = 5000 turns.
Tail Briz ENGINEERING   -   Electrical Engineering

In a buck-boost converter circuit, if the duty cycle of the switch is increased, what effect does it have on the output voltage?

In a buck-boost converter, increasing the duty cycle of the switch decreases the output voltage since it increases the time during which the switch is off, reducing the average voltage across the load.

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