GATE 2020: Toppers Quiz 28 (App update required to attempt this test)

A compound generator is running in cumulative mode and generator emf is 220V. If suddenly series field winding is shorted, what happens to induced emf?

In given circuit if v₁(t) = sin t V and v₂(t) = 2sin (t + 60°) V, the phasor diagram that is applicable to the circuit is

Figure shows a thyristor with the standard terminations of anode (A), cathode (K), gate (G) and the different junctions named J1, J2 and J3. When the thyristor is turned on and conducting

The value of voltage V in the following circuit is given by

In the circuit shown below V₁ = 28 V. The values of I and α are respectively

The current i(t) through a 0.5 F capacitor is given as

Assuming zero initial voltage across the capacitor, what will be voltage at t = 7 sec (in volts)?

Consider the network shown below:

The power absorbed by load resistance R_L is shown in table:

The value of R_L (in kΩ), that would absorb maximum power is __________

In the circuit shown below, the current gain is equal to __________.

An Induction machine has 4 poles and supplied with a frequency of 50 Hz. If the rotor runs at a speed of 1470 rpm. Calculate the difference between the slips if the machine runs as generator and motor.

The circuit shown below implements the function

A single-phase full bridge voltage source inverter fees a load as shown in figure. If the load current is I₀ = 540 sin(ωt – 45°), the power delivered to the load (in KW) is

The current i(t) in a 50 mH inductor is shown in the figure

The energy stored in the inductor is given by

The percentage resistance of a 10kVA 900/200V, 3-phase transformer is 2% if the constant losses in machine are 1% then maximum possible efficiency of the transformer will be?

A two-port network having Z-parameters as  is terminated to a load impedance Z_L as shown. The input impedance Z_in of two port network is given by

For the given circuit waveforms i₁(t) and v₂(t) are given as below:

The value of mutual inductance is _________ H.

In a 4-bit weighted resistor D/A converter, the resistor value corresponding to LSB is 32 kΩ. The resistor value corresponding to MSB will be

A factory has an average load of 400kw at a p.f of 0.8 lagging. A synchronous motor with an efficiency of 88% is used to raise the combined p.f to 0.95 lagging and at the same time motor supply a mechanical load of 80kw: then calculate the p.f. of the synchronous motor ?

A transformer has equivalent resistance and reactance of 2 Ω each respectively and the current and voltage rating are 5 A and 100 V. Its maximum voltage regulation for lagging load is

A Routh table is shown below. The number of poles on right half of s-plane, left half of s-plane and on imaginary axis are

The signal flow graph of a system is

The system is stable for K > _______.

Consider the TTL circuit shown below. Saturated voltage for transistor T₁ and T₂ is V_CE(sat) = 0.2 V.

The value of V_H and V_L are respectively

The speed of a 4-pole Induction Motor is control by varying the supply frequency while maintaining the ratio of supply voltage to supply frequency  constant at rated frequency 50 Hz and rated voltage 400 V its speed is 1440 rpm. Find the speed (in rpm) at 30 Hz if load torque is constant?

A 3 phase  connection is obtained by connecting three single phase transformers. It is feeding a balanced rated load. If one of the transformers is disconnected and load is reduced by 30 %. Now the % of each transformer in open delta connection is overload by

A 440V, 3 – ϕ star connected synchronous motor with x_d = 6Ω and x_q = 4.5Ω is running in parallel with an infinite bus. If its field current is reduced to zero, than find armature current (in Amperes) corresponding to maximum load that can be put on synchronous motor __________

The steady state error in velocity of a system is defined to be

where r is the system input and c is the system output. The unity feedback system has forward transfer function as

The steady state error in velocity for an input of t³u(t) is