Bissoy.com
Doctors Medicines MCQs Q&A

In which type of voltage regulator, does a pair of vibrating contacts intermittently short a portion of the resistance in the field circuit?

In which type of voltage regulator, does a pair of vibrating contacts intermittently short a portion of the resistance in the field circuit? Correct Answer tirril voltage regulator

Tirril Voltage Regulator:

  • In this type of regulator, a fixed resistance is cut in and cut out of the exciter field circuit of the alternator.
  • This is achieved by rapidly opening and closing a shunt circuit across the exciter rheostat, for this reason, it is also known as a vibrating type voltage regulator.
  • Fig. the essential parts of a Tirril voltage regulator.
  • A rheostat R is provided in the exciter circuit and its value is set to give the required excitation.
  • This rheostat is put in and out of the exciter circuit by the regulator, thus varying the exciter voltage to maintain the desired voltage of the alternator.

Additional InformationBrown-Boveri Regulator own-Boveri Regulator:

  • In this type of regulator, exciter field rheostat is varied continuously or in small steps instead of being first completely cut in and then completely cut out as in Tirril regulator.
  • For this purpose, a regulating resistance is connected in series with the field circuit of the exciter.
  • Fluctuations in the alternator voltage are detected by a control device that actuates a motor.
  • The motor drives the regulating rheostat and cuts out or cuts in some resistance from the rheostat, thus changing the exciter and hence the alternator voltage.

Related Questions

In a voltage regulating system a rotating arm moves, depending upon the terminal voltage, across a set of contacts, short circuiting some part or more of the resistance inserted in the exciter field circuit. What type of voltage regulator is this?
Which of the following statements are correct? 1. The pair (AB) is controllable implies that the pair (ATBT) is observable. 2. The pair (AB) is controllable implies that the pair (ATBT) is unobservable. 3. The pair (AC) is observable implies that the pair (ATCT) is controllable. 4. The pair (AC) is observable implies that the pair (ATCT) is uncontrollable. where: A, B and C are having their standard meanings
What are the conditions to be satisfied by a voltage source for using it in switching regulator. i. It must supply the required output power and the losses associated with the switching regulator ii. It must be large enough to supply sufficient dynamic range line and load variations iii. It must be sufficient high to meet the minimum requirement of the regulator system to be designed iv. It may be required to store energy for a specified amount of time during power failure especially if the system is designed for a computer power supply.
A voltage source-series resistance combination is equivalent to a current source-parallel resistance combination if and only if their 1. Respective open-circuit voltages are equal 2. Respective short-circuit currents are equal 3. Resistance remains same in both cases Which of the above statements are correct?
A Zener regulator has to handle supply voltage variation from 19.5V to 22.5V. Find the magnitude of regulating resistance, if the load resistance is 6KΩ. The Zener diode has the following specifications: breakdown voltage =18V, (IZ)Min=2µA, maximum power dissipation=60mW and Zener resistance =20Ω.
Abhishek ordered 6 pair of red shoes and some pair of books. The price of a pair of red shoes is double than that of a pair of book. While preparing the bill the shopkeeper interchanged the number of pair of shoes and books by mistake which increased the bill by 40%. What was the ratio of the number of pair of red shoes and the number of pair of books in the original order?
The ratio of the short circuit current gain of a current amplifier (Ai) to the open circuit voltage gain of a voltage amplifier (AV), given that both amplifiers have the same value of the input resistance (Ri) and output resistance (R0), is
The ratio of the open circuit voltage of a voltage amplifier (AV) to the short circuit transconductance of a (Gm) of a transconductance amplifier, given that both have the same value of the internal resistance (Ri) and the output resistance (R0), is
A pump was installed in a field to supply water to the crops. The duty for this crop is 432 hectares/cumec on the field and the efficiency of pump is 50%. The sown area of the field is 5 hectares. Determine the maximum output required (H.P) of the pump, if the highest water level is 4 meters below the highest portion of the field. Assume negligible field channel losses.
For the circuit shown, determine ZTH for the portion of the circuit external to RL.
Circuit Theorems In Ac Analysis mcq question image