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UPPCL AE 2019: Technical Quiz 2

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Question 1

If the relative permittivity of a diode remains constant, its area is doubled, and its doping concentration is quadrupled. What is its new diffusion capacitance, of originally it was C_D?

Question 2

The open loop transfer function is given below

The correct Nyquist plot depicts

Question 3

A resistance is determined by voltmeter- ammeter method. The voltmeter reads 100 V with a probable error of ± 12 V and the ammeter reads 10 A with a probable error of ± 2 A. The probable error in the computed value of the resistance will be nearly

Question 4

What is the phase displacement between primary and secondary voltages for a star-delta, 3-phase transformer connection shown below?

Question 5

The synchronous reactance of a 500 V, 50 kVA alternator having an effective resistance of 0.2 Ω, if an excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 volts on open circuit, is

Question 6

The IGBT (Insulated Gate Bipolar Transistor) used in the circuit has the following data: t_ON = 3μs, t_OFF = 1.2μs Duty cycle (D) = 0.7, V_CE(sat) = 2v and f_s = 1kHz
What are the switching power losses during turn-on and turn-off, respectively?

Question 7

Match List-I with List-II and select the correct answer using the code given below the Lists:
List-I
A) Magnetic flux density
B) Shunt admittance
C) Attenuation coefficient
D) Phase-change coefficient
List-II
1) Siemens
2) Tesla
3) Radian
4) Neper

Question 8

Load flow studies must be made on a power system before

Question 9

Which statement is incorrect for Oil Circuit Breaker?

Question 10

In a continuous-time signal x(t), which figure correctly describes the time shifted version of x(t − 2).

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ESE & GATE EE General

Oct 17ESE & GATE EE