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UPPCL AE 2019: Technical Quiz 5

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Question 1

A fixed square 9-turn coil with lower left corner at origin has side length x₁ and y₁. If x₁ = y₁ = 1m and if the magnetic flux density

is normal to the plane of the coil and has a space variation of amplitude.

Find the rms value of electromotive force (emf) induced in the coil if B varies harmonically with time at 1000 cycles per second.

Question 2

The reverse saturation current of a reverse biased p-n junction diode increases 64 times due to a rise in ambient temperature. If the original temperature was 50^oC, what is the final temperature?

Question 3

Transfer function of discrete time system derived from state model is given by

Question 4

To interface a slow memory, wait states are added by

Question 5

In a reliability subsystem as shown, what will be the overall reliability of the system, if all individual components have reliability?

Question 6

A capacitor is connected across a portion of resistance of the multiplier in order to make the pressure coil circuit of the wattmeter non-inductive. The value of this resistance is r while the total resistance and
inductance of the pressure circuit are respectively R_P and L. The value of the capacitance C is

Question 7

A filter that allows high and low frequencies to pass but attenuates any signal with a frequency between two corner frequencies is a

Question 8

A three-phase semi-converter feeds the armature of a separately excited dc motor supplying a non-zero load torque. For steady state operation the motor current is found to assume zero value at certain instances of time. At such instances the armature voltage

Question 9

In a 3-phase, 60 Hz, 500 MVA, 15 kV, 32 pole hydroelectric generating unit, the values of ω_syn will ω_msyn be nearly?

Question 10

Consider the following types of transmission lines:
1) Open-wire line
2) Twin-lead wire
3) Coaxial cable
The capacitance per meter will be least in which of the above transmission lines?

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ESE & GATE EE General

Feb 15ESE & GATE EE