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| . | SOLUTION TO NTPC PLACEMENT PAPER. GENERAL APTITUDE QUESTIONS:- 1 The expression (11.98 x 11.98 + 11.98 x x + 0.02 x 0.02) will be a perfect square for x equal to: | Answer: Option C Explanation: Given expression = (11.98)2 + (0.02)2 + 11.98 x x. For the given expression to be a perfect square, we must have 11.98 x x = 2 x 11.98 x 0.02 or x = 0.04 |
| 2. | Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is: | Answer: Option C Explanation: | C.I. | = Rs. | | 4000 x | | 1 + | 10 | | 2 | – 4000 | | 100 |
| | = Rs. | | 4000 x | 11 | x | 11 | – 4000 | | 10 | 10 |
| | = Rs. 840. |
Sum = Rs. | | 420 x 100 | | = Rs. 1750. | 3 x 8 |
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| 3. | A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water? | Answer: Option B Explanation: Rate downstream = | | 16 | kmph = 8 kmph. | 2 |
Rate upstream = | | 16 | kmph = 4 kmph. | 4 |
Speed in still water = | 1 | (8 + 4) kmph = 6 kmph. | 2 |
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| 4. | A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half? | Answer: Option D Explanation: Part filled by (A + B) in 1 minute = | | 1 | + | 1 | | = | 1 | . | 60 | 40 | 24 |
Suppose the tank is filled in x minutes. x = 30 min. |
| 5 . | Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed? | Answer: Option C Explanation: Number of ways of selecting (3 consonants out of 7) and (2 vowels out of 4) | = (7C3 x 4C2) | | = | | 7 x 6 x 5 | x | 4 x 3 | | 3 x 2 x 1 | 2 x 1 |
| | = 210. |
Number of groups, each having 3 consonants and 2 vowels = 210. Each group contains 5 letters. Number of ways of arranging
5 letters among themselves | = 5! | | = 5 x 4 x 3 x 2 x 1 | | = 120. |
Required number of ways = (210 x 120) = 25200 . TECHNICAL QUESTIONS:- |
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| 2. | If 750 µA is flowing through 11 k of resistance, what is the voltage drop across the resistor? |
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| 3. | At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power? |
Answer: Option A |
| 4. | A half-watt is equal to how many milliwatts? |
Answer: Option C |
| 5. | Series aiding is a term sometimes used to describe voltage sources of the same polarity in series. |
Answer: Option A |
| 6. | If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is |
Answer: Option B |
| 7. | In a parallel circuit, the branch with the lowest resistance has the most current. |
Answer: Option A |
| 11. | Third-order determinants are evaluated by the expansion method or by the cofactor method. |
Answer: Option A |
| 12. | A 2 F, a 4 F, and a 10 F capacitor are connected in series. The total capacitance is less than |
Answer: Option D |
| 13. | Five time constants are required for a capacitor to charge fully or discharge fully. |
Answer: Option A |
| 14. | In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined. |
Answer: Option A |
| 15. | A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is |
Answer: Option A |
| 16. | A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 , C = 80 F, and L = 10 mH. The total impedance, expressed in polar form, is |
Answer: Option A |
| 17. | Referring to Problem 18, what is the bandwidth of the filter? |
Answer: Option D |
| 18. | In an RC differentiator, the sum of the capacitor voltage and the resistor voltage at any instant |
| A. | | | B. | | must be equal to the applied voltage |
| | C. | | is less than the applied voltage but greater than zero |
| | D. | |
Answer: Option B |
| 19. | If the RC time constant of an integrator is increased, as the time constant is increased |
| A. | | the capacitor charges more during a pulse and discharges less between pulses |
| | B. | | the capacitor charges less during a pulse and discharges more between pulses |
| | C. | | the capacitor charges more during a pulse and discharges more between pulses |
| | D. | | the capacitor charges less during a pulse and discharges less between pulses |
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Answer: Option D |
| 20. | In an RL integrating circuit, the output voltage is taken across the inductor. |
Answer: Option B |
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