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3 years ago

What’s a pnp transitor?

Engineering

2 answers:

Dafna1 [17]3 years ago

7 0

Answer:

A transistor is of two types: PNP and NPN

Explanation:

A transistor is current controlled device in which the current flow by the movement of the electrons and wholes.

The NPN and PNP transistor are the types of the BJT (Bipolar junction transistor) that have two uses i.e switching and amplification.

A PNP transistor have three junction i.e P, N and P where the base is connected to the N - junction. The P junction is high in number of wholes and N- junction have high numbers of electrons.

In the PNP transistor the voltage is provided to the emitter and base terminal with base connected to the negative terminal of the voltage source and emitter connected to its positive terminal. The direction of the flow of the current is from emitter to collector whenever a significant voltage is provided to the emitter base junction.

Damm [24]3 years ago

6 0

Answer:

PnP transistor is a current controlled device. It has two crystal diodes connected back to back. The left side of the diode is known as the emitter-base diode and the other side which is the right side of the diode is known as the collector-base diode.

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All of these are true about a magnesium part EXCEPT that it:

d1i1m1o1n [39]

The option that is an exception about the properties of magnesium is the option;

Is typically made from stampings

The reason why the option is an exception is given as follows:

Magnesium is a nonferrous metal as it is usually combined with manganese, zinc and aluminum.

Within the group of structural metals, magnesium is the lightest, having a high strength-to-weight ratio.

Magnesium posses good dampening characteristics, and is capable of reducing vibration of mechanical parts.

However

Magnesium parts used for vehicle construction are die cast, and not made from stampings because magnesium is more difficult to stamp compared to aluminum.

Therefore, the correct option for the statement that is an exception from the true statements about magnesium is magnesium; is typically made from stampings

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2 years ago

What is meant by the acronym ISO

scZoUnD [109]

Answer:

International Organization For Standardization

Explanation:

This is the body within Geneva, Switzerland that promotes worldwide industrial and commercial standards

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3 years ago

A proposed piping and pumping system has 20-psig static pressure, and the piping discharges to atmosphere 160 ft above the pump.

larisa86 [58]

Answer: (B) 100

Explanation:

Given that;

Pstatic = 20 psig , hz = 160ft, hf = 20ft

Now total head will be;

T.h = hz + hf

T.h= 160 + 20

T.h = 180ft

Minimum pressure = Psatic + egh

we know that specific weight of water is 62.4 (lb/ft3)

P.min = (20 bf/in² ) + (62.4 b/ft³ × 180 fr

P.min = (20 bf/in² ) + ( 62.4 × 180 × 1 ft²/144 in²)

P.min = 20 + 78

P.min = 98 lbf/in²

Therefore the minimum pressure rating (psi) of the piping system is most nearly B) 100

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3 years ago

In a case where electrical current leakage from the circuit occurs, the GFCI would do the following:

Jobisdone [24]

Answer:

Sense the current leakage

Trip the circuit

Cut off the electricity

Explanation:

The correct order is -

Sense the current leakage

Trip the circuit

Cut off the electricity

Reason -

First step has to be taken to sense the electric current leakage without it being detected, it cant be dealt with.

The second step consists of tripping the circuit so at to remove the flow of electricity.

The third step is to Cut the electricity off so to stop the leakage and be safe.

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