MCQs on Basic Principles of Electrical Switching

1 - Question

How many terminals does a GTO (Gate turn off thyristor) switch has?
a) 2
b) 3
c) 4
d) 5
View Answer Answer: b
Explanation: A GTO (Gate turn off thyristor) switch has total 3 terminals. One terminal is a gate terminal and other two terminals are anode and cathode terminal respectively. It is a bipolar semiconductor switching device.



2 - Question

What is the full form of DPDT with respect to switches?
a) Double pull double throw
b) Double pole double throw
c) Double pull dual throw
d) Dual pole dual throw
View Answer Answer: b
Explanation: The full form of DPDT is “Double pole double throw” with respect to switches. This type of switches has two inputs and four outputs. These switches are widely used in the robotic sector due to its versatile nature.



3 - Question

What is the full form of DIAC with respect to switches?
a) Diode alternating current
b) Dipole alternating current
c) Dual alternating current
d) Direct alternating current
View Answer Answer: a
Explanation: The full form of DIAC is “Diode alternating current” with respect to switches. It is a two terminal, bidirectional switching device. Since it is bi-directional, therefore it does not have a fixed anode and cathode terminal. advertisement



4 - Question

Which is a type of solid state switch?
a) NPN Diode
b) Bipolar junction transistor
c) DPDT(Double pole double throw) Switch
d) Push button Switch
View Answer Answer: b
Explanation: Bipolar junction transistor is a type of solid state switch. Theses switches have no moving parts and no physical contacts which is why they are called so. They are also called as electronic switch.



5 - Question

DIAC (Diode alternating current) switch has three terminals.
a) True
b) False
View Answer Answer: b
Explanation: DIAC (Diode alternating current) switch does not have three terminals. It is a two terminal, bidirectional switching device. Since it is bi-directional, therefore it does not have a fixed anode and cathode terminal.



6 - Question

TRIAC (Triode alternating current) is a bi-directional switching device.
a) True
b) False
View Answer Answer: a
Explanation: TRIAC (Triode alternating current) is a bi-directional switching device. They are often used as motor driver or motor controller to control the revolution speed of the motor shaft. They are even capable of controlling AC power.



7 - Question

Which is an example of pressure switch?
a) KSD9700
b) XMPA06B2131
c) SLB700A/06VA
d) BMP180
View Answer Answer: b
Explanation: XMPA06B2131 is an example of pressure switch. It is manufactured by “SCHNEIDER ELECTRIC”. KSD9700 is an example of temperature switch. BMP180 is an example of pressure sensor. SLB700A/06VA is an example of force sensor.



8 - Question

Which is an example of temperature switch?
a) KSD9700
b) CMCP793V-500
c) SLB700A/06VA
d) BMP180
View Answer Answer: a
Explanation: KSD9700 is an example of temperature switch. It has 250 volt 5 ampere input rating. It has an operating temperature of up to 150°C. BMP180 is an example of pressure sensor. SLB700A/06VA is an example of force sensor. CMCP793V-500 is a velocity sensor.



9 - Question

Which type of switch can be used as automatic switch to detect the level of water in a water tank and perform suitable switching action?
a) Flow Switch
b) Float switch
c) DPDT (Double pole double throw) Switch
d) Push button Switch
View Answer Answer: b
Explanation: Float switch can be used as automatic switch to detect the level of water in a water tank and perform suitable switching action. These switches are mainly used to control the AC and DC water pumps. When the water exceeds a certain limit the floating element of the switch moves along with it and triggers the switch to act accordingly.



10 - Question

Which type of switch can be used as automatic switch to detect the presence of object by its weight?
a) SPST (Single pole Single throw) Switch
b) Limit switch
c) DPDT (Double pole double throw) Switch
d) Push button Switch
View Answer Answer: b
Explanation: Limit switch is used as automatic switch to detect the presence of object. These switches are usually used to detect the presence or absence of the object. They have a flexible arm which is responsible for the switching action.



11 - Question

A GTO (Gate turn off thyristor) switch is a unipolar device.
a) True
b) False
View Answer Answer: b
Explanation: A GTO (Gate turn off thyristor) switch is not a unipolar device. It is a bipolar, three terminal semiconductor switching device. It uses both electrons and holes for the conduction of current through it.



12 - Question

DIAC (Diode alternating current) is a bi-directional switching device.
a) True
b) False
View Answer Answer: a
Explanation: DIAC (Diode alternating current) is a bi-directional switching device. . It is a two terminal switching device that does not have a fixed anode and cathode terminal. It can be used regardless of the identification of anode and cathode terminal.



13 - Question

Bipolar transistor can be used as a switch.
a) True
b) False
View Answer Answer: a
Explanation: Bipolar transistor can be used as a switch. This configuration of transistor is widely used in the electronic industry. A small base current can control comparatively large emitter to collector current.



14 - Question

Which switch can be used to rotate a DC motor in both clockwise and anti-clock wise direction?
a) SPST (Single pole Single throw) Switch
b) DPST (Double pole single throw) Switch
c) DPDT (Double pole double throw) Switch
d) Push button Switch
View Answer Answer: c
Explanation: DPDT (Double pole double throw) Switch can be used to rotate a DC motor in both clockwise and anti-clock wise direction. These switches are mostly preferred while making a remote controlled car projects.



15 - Question

What is the full form of SPDT with respect to switches?
a) Single pull double throw
b) Single pole double throw
c) Single pull dual throw
d) Singular pole dual throw
View Answer Answer: b
Explanation: The full form of SPDT is “Single pole double throw” with respect to switches. This type of switches has one input and two outputs. These switches are versatile in nature as it facilitates with two output terminal form a single input.

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