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- Question 1 of 17
A three-phase, 50 Hz salient-pole synchronous motor has a per-phase direct-axis reactance (Xd) of 0.8 pu and a per-phase quadrature-axis reactance (Xq) of 0.6 pu. Resistance of the machine is negligible. It is drawing full-load current at 0.8 pf (leading). When the terminal voltage is 1 pu, per-phase induced voltage, in pu, isCorrectIncorrect
- Question 2 of 17
A single-phase, 22 kVA, 2200 V/ 220 V, 50 Hz, distribution transformer is to be connected as an auto-transformer to get an output voltage of 2420 V. Its maximum kVA rating as an autotransformer isCorrectIncorrect
- Question 3 of 17
A single-phase full-bridge voltage source inverter (VSI) is fed from a 300 V battery. A pulse of 120o duration is used to trigger the appropriate devices in each half-cycle. The rms value of the fundamental component of the output voltage, in volts, isCorrectIncorrect
- Question 4 of 17
A single-phase transmission line has two conductors each of 10 mm radius. These are fixed at a center-to-center distance of 1 m in a horizontal plane. This is now converted to a three-phase transmission line by introducing a third conductor of the same radius. This conductor is fixed at an equal distance D from the two single-phase conductors. The three-phase line is fully transposed. The positive sequence inductance per phase of the three-phase system is to be 5% more than that of the inductance per conductor of the single-phase system. The distance D, in meters, isCorrectIncorrect
- Question 5 of 17
A dc voltage with ripple is given by v(t) = [100 + 10 sin(wt) − 5 sin (3wt)] volts. Measurements of this voltage v(t), made by moving-coil and moving-iron voltmeters, show readings of V1 and V2 respectively. The value of V2 − V1, in volts, isCorrectIncorrect
- Question 6 of 17
If a continuous function f(x) does not have a root in the interval [a,b] then which one of the following statements is true?CorrectIncorrect
- Question 7 of 17
If the sum of diagonal elements of a 2*2 matrix is -6 then the maximum possible values of determinant of matrix isCorrectIncorrect
- Question 8 of 17
A (0-50A) moving coil ammeter has a voltage drop of .1V across its terminals at full scale deflection.The external shunt resistance needed to extend its range to (0-500A) isCorrectIncorrect
- Question 9 of 17
Of the four characteristics given below which are the major requirements for an instrumentation amplifier?
P.High common mode rejection ratio
Q.High input impedance
S.High output impedanceCorrectIncorrect
- Question 10 of 17
Base load power plants are
P. Wind farms
Q.Run of river plants
R.nuclear power plants
S.diesel power plantsCorrectIncorrect
- Question 11 of 17
The self inductance of the primary winding of a single phase 50Hz transformer is 800mH and that of the secondary winding is 600mH.The mutual inductance between these two winding is 480mH.The secondary winding of this transformer is short circuited and the primary winding is connected to a 50Hz single phase sinusoidal voltage source.The current flowing in both the windings is less than their respective rated current.The resistance of both windings can be neglected.What is the effective inductance (in mH) seen by the source?CorrectIncorrect
- Question 12 of 17
The primary mmf is least affected by the secondary terminal conditions in aCorrectIncorrect
- Question 13 of 17
The signum function is given by sgn(x) = x/|x| for x not equal to 0 and 0 for x = 0. The fourier series expansion of sgn(cos(t)) hasCorrectIncorrect
- Question 14 of 17
Two players A and B alternatively keep rolling a fair dice.The person to get a six first wins the game.Given that player A starts the game the probability that A wins the game isCorrectIncorrect
- Question 15 of 17
A 3-phase 50Hz square wave (6-step) VSI feeds a 3-phase 4 pole induction motor.The VSI line voltage has a dominant 5th harmonic component.If the operating slip of the motor with respect to fundamental component voltage is .04 the slip of the motor with respect to 5th harmonic component of voltage isCorrectIncorrect
- Question 16 of 17
A 8 bit unipolar successive approximation register type ADC is used to convert 3.5V to digital equivalent output.The reference voltage is +5V.The output of the ADC at the end of third clock pulse after the start of the conversion isCorrectIncorrect
- Question 17 of 17
Assertion: Fast decoupled load flow method gives approximation load flow solution because it uses several assumptions.
Reason: Accuracy depends on the power mismatch vector tolerance.CorrectIncorrect