August 12

EASY ROUND

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A prime number n, that remains a prime when digits are deleted from it one at a time.

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These are a type of series expansion in which all terms are nonnegative integer powers of the variable.

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The impossibility of knowing both the precise location and velocity of subatomic particle at the same time is known as the ______.

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In optics, this effect refers to the blurring of the image produced on a concave mirror due to the convergence of rays far from the mirror to other points on the principal axis. What do you call this effect?

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A type of oscillator that is very commonly used as local oscillator in superheterodyne radio receiver. It uses a capacitive voltage divider network as its feedback source.

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A non-volatile read/write random access semiconductor memory in which data are stored as charge on the floating gate of a certain type of FET.

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What do you call the ratio of incident to transmitted radiation through a grid ratio of patient dose with and without grid?

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A type of microphone that uses the principle of a capacitor as a means of transduction. It uses a polarizing voltage of between 9 and 48 V of DC supply applied to its diaphragm by an external power supply.

MODERATE ROUND

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An adjoint curve which bears a special relation to the base curve.

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What is the allowable error in measuring the edge of the cube that is intended to hold 8 cu. m., if the error of the computed volume is not to exceed 0.03 cu. m?

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In second law of thermodynamic, this states that no heat engine can have a thermal efficiency of 100% or as far as power plant to operate, the working fluid must exchange heat with the environment as well as the furnace.

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A laboratory experiment was performed to determine the percent by mass of water in a hydrate. The accepted value is 36.0% water whose observed value has an error of 5.00%. Find the percent by mass of water.

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It refers to the process of shrinking the size and power dissipation of electronic circuits. It also involves surface mount technology.

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220Ω resistor is connected in series with the gate of an SCR. The gate current required to fire the SCR is 7mA. What is the input voltage (Vin) required to fire the SCR?

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It is defined as the optimum level of a test tone on a channel at same point in a communication system.

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For an electronic device operating at a temperature of 17°C with a bandwidth of 10 kHz, determine the thermal noise power in dBm.

DIFFICULT LEVEL

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A first step toward making continuous models and equations suitable for numerical evaluation and implementation on digital computers.

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It is the practice of almost all bank in the Philippines that when they grant a loan, the interest for 1 year is automatically deducted from the principal amount upon release of money to a borrower. Let us therefore assume that you applied for a loan with the bank and the P80000 was approved at an interest rate of 14% of which P11200 was deducted and you were given ac check of P68800. Since you have to pay the amount of P80000 one year after, what then will be the effective interest rate?

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This law states that if a process can be written as the sum of several stepwise processes, the enthalphy change the total process equals the sum of the enthalphy changes of the various steps.

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A carnot heat engine receives 500KJ of heat per cycle from a high-temperature source at 600 °C and rejects heat a low temperature sink at 40°C. Determine the thermal efficiency of this Carnot engine.

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This can be defined as the ratio of output d.c. power available at the load to the power rating of the transformer used in the rectifier circuit.

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For the JFET in Fig. 2, VGS (off) = – 4V and IDSS = 12 mA. Determine the minimum value of VDD required to put the device in the constant-current region of operation.

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In Mobile Communications, IMSI is a unique number, usually fifteen digits, associated with Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) network mobile phone users. What does IMSI stands for?

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An FM transmitter system is using a 1MHz crystal oscillator to generate a very stable 108MHz final carrier frequency. The output of the crystal oscillator is fed to a x36 multiplier circuit then mixed with a 34.5 MHz signal. The sum output of the mixer is filtered out, while the difference is fed to another multiplier in order to generate the final carrier frequency. What is the multiplier value?