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Consider the following statements: 1. In a silicon controlled rectifier (SCR), if the cathode gate is reverse-biased, then the SCR cannot fire at all. 2. The turn-on time of an SCR increases with temperature. 3. After an SCR is turned on, it can be made to turn off again by reverse biasing the gate. 4. Gate recovery time is the minimum time that the anode voltage must be maintained below holding voltage VH to turn off the SCR. Which of these statements are correct?
In a federal system why a Judiciary is essential ? a. To enterprete the Constitution b. To protect the Fundamental Rights c. To protect the Supremacy of the Constitution d. To protect Democratic system e. To settle disputes between centre and states f. To protect parliamentary system
A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo
A 220 1-ϕ, 220 Ω  resistor is connected in series with the gate of an SCR as shown in the given figure. The gate current required to fire the SCR is 7 mA. what is the input voltage (Vin) required to fire the SCR?
According to Article 51A of the Constitution which among the following are correct?
1. It shall be the duty of every state to protect monuments of national importance.
2. It shall be the duty of every citizen of India to uphold and protect the sovereignty, unity and integrity of India.
3. The state shall take steps to protect and improve the environment and to safeguard the forest and wild life of the country.
4. It shall be the duty of every citizen of India to develop the scientific temper, humanism and the spirit of inquiry and reform.
Choose your answer from the following options:
Which of the following statements characterise the objectives of labour legislation?
1. Improve the conditions of labour
2. To protect the rights of labour unions
3. To protect employers
4. To protect the public from possible excess on the part of organised labour
Assertion (A) Some of the earliest piece of Labour Legislation in India appear to have been enacted to protect the interest of the employers.
Reason (R) The policy of the government was to protect the social system rather than to protect workers.
Which of the following is the least expensive protection for overcurrent is low voltage system ?
Which of the following statements is true for overcurrent protection of transmission lines?
For a SCR the maximum rms on-state current is 35 A. If the SCR is used in a resistive circuit for a rectangular wave with conduction angle of 90°. Calculate the average & rms currents respectively.