Last Updated: Feb 27, 2017
Jan 5 • General • 2093 Views • No Comments on SOLUTION TO NTPC PLACEMENT PAPER
|
| . |
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
|
|
| 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
|
|
| 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.
|
Then,
|
x
|
|
1
|
+
|
1
|
|
= 1
|
|
2
|
24
|
40
|
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:- |
|
|
| 2. |
If 750 µA is flowing through 11 k of resistance, what is the voltage drop across the resistor? |
|
|
| 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 |
|
Answer: Option D
|
| 20. |
In an RL integrating circuit, the output voltage is taken across the inductor. |
|
Answer: Option B
|
aptitute test questions with solution
« iGATE PLACEMENT PAPER Sample Interview Questions of Few Companies »
Tell us Your Queries, Suggestions and Feedback