GATE 2022 Rapid Revision Quiz 9

An n-bit carry Look ahead adder is designed using only Ex-OR, AND, OR gates. The propagation delay of each Ex-OR gate is 20 ns and that of each AND, OR gates is t₀ ns. If the total propagation delay of adder circuit is 60 ns, then value of t_o will be (given that to ≤ 20 ns.

Consider a single stage having

Rise time = tr₁

Upper cut off frequency = f_H1

Also, they are related as tr₁ =

Suppose two identical stages are cascaded having tr₂ (rise time) = a tr₁. The value is a is___

A DC voltage of 100 V is applied to a coil having R = 10 ohm and L = 10 H. What is the time constant of the circuit?

The magnitude of gain when switch S is opened is A_o. Find the gain when the switch is closed.

A ‘P’ pole, 50 Hz alternator is driven by a 60 Hz synchronous motor. Calculate the number of poles for the synchronous motor.

The Nyquist plot of e^-4s is a circle of radius ?

A generator has the sequence reactance as X₁ = 60%, X₂ = 25% and X₀ = 15%. The value of resistance to be connected to neutral such that the current for single line to ground fault does not exceed the rated current (take E_a = 1 p.u.)