GATE 2021 : Toppers Quiz 21 (App update required to attempt this test)

Which of the following can be a static electric field?

A 300 kVA Transformer has core loss of 1.5 kW & full load Cu loss of 4.5 kW. Calculate maximum efficiency and the load at which it occurs.

What will be he distribution factor K_d for 4-pole 50 Hz alternator that has double layer winding of 10 turns with 60 turns/coil and is short Pitched by 36° electrical ?

The flux density in the pole of a DC generator is 0.5 T and area 80 cm². The leakage coefficient is 1.3. If there are 800 conductors in the lap wounded armature, calculate the emf generated when generator is rotating at a speed of 1200 rpm, ____________ in volts.

A 400 V, 4-pole, 60 Hz, Y connected induction motor has stator impedance of (0.05 + j 0.3) Ω and stand still rotor impedance referred to stator is (0.1 + j 0.25) Ω. Determine the torque developed by the motor at a slip of 6% in Nm. (Neglect magnetizing branch)

If in the below figure, the ratio of R_a to R_b is 1000Ω, R₁ is 5Ω and R₁=0.5R₂ then the value of R₄ _ .

A 1– of 30 km long consists of two parallel each of 10 mm is diameter and 2 m apart. The height of conductors above ground is 10 m. The capacitance of the line is? (in pF/m)

SAR type analog to digital ammeter has a resolution of 20 mV. What will be the digital output for an analog input of 2.16 V?

If , then the region of convergence (ROC) of its z-transform in the z-plane will be ?

A filter represented by the signal flows graph shown in the figure. Its input is x(t) and output is y(t). The transfer function of the filter is:

A 3-phase salient pole alternator has direct axis reactance as 0.4 p.u. and quadrature axis reactance as 0.2 p.u. The excitation voltage is 1.3 p.u. and terminal voltage is held at 1 p.u. For the maximum power output, the rotor angle should be _______.

A 400 kVA transformer has 93% efficiency at full load 0.8 power factor lagging and 95% efficiency at half load at unity power factor, then what is the maximum efficiency of the transformer at unity power factor load?

For the given BJT, if the D .C biasing is not present the output is taken from termini C, which is collector terminal. If the input voltage change from “0 – 20mV”. What would be the minimum possible resistance Rc required so that the BJT will work in forward active region. Assume the reverse saturation current of B – E junction, I_s = 10^-14 A, the thermal voltage V_T = 25mV and η = 1

For a unity negative feedback system open loop transfer function

Find the steady state error at valid break point for unit ramp input.

If V (t) = A₁sin(ω₁t+θ₁) + A₂sin (ω₂t –θ₂) for shown circuit. the value of A₁ + A₂ is__

Reactive power compensation is applied at the mid-point of transmission line such that voltage at both ends is maintained at 1 p.u. Voltage at mid-point is maintained at 0.96 p.u. If total reactance of the line is 0.2 p.u., then the steady state power transfer limit of the transmission line is

The voltage at the point of commencement of supply shall not vary by more than

The screen of a CRT is 60 cm from the centre of the plates. The parallel deflecting plates are of length 2 cm and are 5 mm apart. It has anode voltage of 2400 V. The input is supplied deflecting plates through an amplifier with gain of 20. To get a deflection of 3 cm on screen the input voltage is

A 4-pole, 50 Hz, 11 KV turbo generator has a rating of 40 MW. Power factor 0.8 lagging its rotor has a moment of inertia of 8880 kg-m². Calculate its momentum in MJ-s/electrical degree. (Answer upto three decimal places)

The maximum sampling interval for is______ m sec.
(Where * denotes convolution)