MCQs on Electrical Actuating Systems – Representation of Output Devices
1 - Question
What does this symbol represent in an electric circuit?
a) Diode
b) Inductor
c) Light emitting source
d) Transistor
View Answer
Explanation: This symbol represents Light emitting source. This symbol is generally used to represent a LED(Light emitting diode) or any other light emitting source in the electrical circuit. It is usually used as an output device to represent the flow of current through a branch.
2 - Question
What does this symbol represent in an electric circuit?
a) Motor
b) Inductor
c) Light emitting source
d) Multimeter
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Explanation: This symbol represents a Motor in an electric circuit. Motors are output device of a circuit that produces rotational motion. They convert electrical energy to mechanical energy. It works on the principle of Flemings left hand rule.
3 - Question
What does this symbol represent in an electric circuit?
a) Resistor
b) Inductor
c) Capacitor
d) Transistor
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Explanation: This symbol represents capacitor. Capacitor is a passive element which is used as an energy storing device in the electrical circuits. Capacitance of a capacitor is measured in farads. It is the SI unit of capacitance. advertisement
4 - Question
What does this symbol represent in an electric circuit?
a) Resistor
b) Inductor
c) PNP Transistor
d) NPN Transistor
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Explanation: This symbol represents PNP Transistor. When an “N” type material is sandwiched between two “P” type materials, then a PNP transistor is formed. This “P” type material is actually doped with “N” type material.
5 - Question
A diode has no effect on any electric circuit if its terminals are reversed.
a) True
b) False
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Explanation: A diode will affect the electric circuit if its terminals are reversed. It is so because its properties will completely change when its terminal are reversed. Since it is a unidirectional device so it will only allow current to flow in one direction only and blocks it from other direction.
6 - Question
What is the full form of FET?
a) Field effect thyristor
b) Field effect thermistor
c) Field effect transistor
d) Field effective transistor
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Explanation: FET stands for field effect transistor. It is a three terminal semiconductor device namely; Source, drain and gate. It is a voltage controlled device (i.e) its operation can be controlled by changing the input voltage.
7 - Question
What does this symbol represent in an electric circuit?
a) N channel enhancement type MOSFET
b) P channel enhancement type MOSFET
c) P channel depletion type MOSFET
d) N channel depletion type MOSFET
View Answer
Explanation: This symbol represents a P channel enhancement type MOSFET. MOSFET stands for metal oxide semiconductor field effect transistor. These MOSFET’s do not have inbuilt channels; the channels are induced by applying a voltage greater than the threshold voltage at the gate terminal.
8 - Question
Which passive element of a circuit is represented by a zig-zag line composed of sharp edged and even distributed alternating crests and troughs?
a) Resistor
b) Capacitor
c) Inductor
d) Battery
View Answer
Explanation: Resistor is a passive element of a circuit is represented by a zig-zag line composed of conical and even shaped alternating crests and troughs. The unit of resistance is ohm which is denoted by Greek letter omega(Ω).
9 - Question
What does this symbol represent in an electric circuit?
a) N channel enhancement type MOSFET
b) P channel enhancement type MOSFET
c) P channel depletion type MOSFET
d) N channel depletion type MOSFET
View Answer
Explanation: This symbol represents a P channel depletion type MOSFET. MOSFET stands for metal oxide semiconductor field effect transistor. These MOSFET’s have inbuilt channels which is made up of “P” type material.
10 - Question
What does this symbol represent in an electric circuit?
a) N channel enhancement type MOSFET
b) P channel enhancement type MOSFET
c) P channel depletion type MOSFET
d) N channel depletion type MOSFET
View Answer
Explanation: This symbol represents an N channel enhancement type MOSFET. MOSFET stands for metal oxide semiconductor field effect transistor. These MOSFET’s do not have inbuilt channels; the channels are induced by applying a voltage greater than the threshold voltage at the gate terminal.
11 - Question
A JFET (Junction Field effect transistor) is a current controlled device.
a) True
b) False
View Answer
Explanation: A JFET (Junction Field effect transistor) is not a current controlled device. It is a voltage controlled device (i.e) its operation can be controlled by changing the input voltage. A BJT(Bipolar junction transistor) is a current controlled device.
12 - Question
What does this symbol represent in an electric circuit?
a) Diode
b) Inductor
c) Light emitting source
d) Transistor
View Answer
Explanation: This symbol represents Light emitting source. It is a two terminal component of an electric circuit which allows unidirectional flow of current. An ideal diode has zero forward bias resistance and infinite reverse bias resistance.
13 - Question
What does this symbol represent in an electric circuit?
a) Ammeter
b) Voltmeter
c) Anode tube
d) Anonymous device
View Answer
Explanation: This symbol represents an Ammeter. Ammeters are used to measure the current flowing through a branch. They are placed in series with the circuit components in order to measure the branch current.
14 - Question
What does this symbol represent in an electric circuit?
a) N channel enhancement type MOSFET
b) P channel enhancement type MOSFET
c) P channel depletion type MOSFET
d) N channel depletion type MOSFET
View Answer
Explanation: This symbol represents an N channel depletion type MOSFET. MOSFET stands for metal oxide semiconductor field effect transistor. These MOSFET’s have inbuilt channels which is made up of “N” type material.
15 - Question
What does this symbol represent in an electric circuit?
a) Resistor
b) Inductor
c) PNP Transistor
d) NPN Transistor
View Answer
Explanation: This symbol represents NPN Transistor. When a “P” type material is sandwiched between two “N” type materials, then a NPN transistor is formed. This “N” type material is actually doped with “P” type material.