A shunt motor has armature resistance of 12. It is connected to 110V line and rotating at 3000 r/min. CEMF is 90V and armature is lap-wound. Calculate, (1) Starting current Armature current at the given induced voltage. (ii) (iii) If dynamic braking is used and initial braking current required is 1.5 times the armature current in (ii), determine the value of the braking resistor. (iv) CEMF and the armature current when motor runs at 2000 r/min

Q: Define circuit breaker and write any two types

A: Circuit Breaker - Circuit breakers are mechanical switching equipment that may individually or…

Q: 30) A specification requires the PV array for a stand-alone PV system to be sized to produce 1.25…

A:

Q: Name two nationally recognised electrical testing laboratories in the United States.

A: In the following section, two nationally recognized electrical testing laboratories present in the…

Q: To turn on all the LEDS with the instruction "OUT AL, 43", AL should be first set to AA 00 55 FF

A:

Q: What will this voltmeter register when connected to a battery as shown (assume a battery voltage of…

A:

Q: What is the minimum wire size for a 30 amp circuit?

A: To determine the minimum wire size for a 30 amp circuit. For the minimum wire size refer the NEC…

Q: Define minterms.

A: A Minterm of n factors is a result of the factors in which each shows up precisely once in evident…

Q: What is the device address used by the instruction OUT A4, AL?

A:

Q: included with the kitchen small appliance branch circuits?

A: There are many devices that can be included with the kitchen small appliance branch circuits

Q: If you dont have a vise to hold a EMT conduit what other two methods could you use to hold the EMT…

A: To hold the EMT conduit in place while cutting with hacksaw, following items or methods can be used…

Q: What is the specific procedure for clearing an EPROM for the first time

A: EPROM (Erasable Programmable Read-Only Memory) is a type of non-volatile memory that can be…

Q: Question 1 A microcontroller is used to control three LEDS in series (Blue, Red and White). Assume…

A: Here, we have asked to design an interfacing circuit to control three LEDs connected in series,…

Types of Thyristors

With four layers of alternating P- and N- materials, a thyristor is a solid-state semiconductor device. It acts as a type of bi-stable switch and it conducts when the gate receives a current trigger and continues to conduct until the voltage is reverse biased across the device or by some means until the voltage is removed. The silicon-controlled rectifier is considered synonymous with thyristors by some sources. Thyristors are defined as more complex by other sources as it contains at least four-layer of alternating N-type and P-type substrate. They find large applications in the control of electrical power supplies, electric motor speed control, and ranging of light dimmers because thyristors can control large amounts of power supplies and voltage with a small device. The circuit symbol of the thyristor is given below.