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10+ National Australia Bank Interview Questions and Answers

Updated 4 Oct 2024
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Q1. How many ways would one arrange sets of coloured balls, the first set all red, the next all blue, and the last all green, and all balls in a set are identical, in a line?

Ans.

The number of ways to arrange sets of coloured balls in a line.

  • The number of ways to arrange the red balls is the factorial of the number of red balls.

  • The number of ways to arrange the blue balls is the factorial of the number of blue balls.

  • The number of ways to arrange the green balls is the factorial of the number of green balls.

  • To find the total number of arrangements, multiply the number of arrangements for each set.

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Q2. How do you implement the overlap-add method of convolution?

Ans.

Overlap-add method of convolution is implemented by dividing the input signal into overlapping segments and convolving each segment with a filter.

  • Divide the input signal into overlapping segments

  • Apply the filter to each segment

  • Add the convolved segments together to get the output signal

  • The length of each segment should be greater than or equal to the length of the filter

  • The overlap between adjacent segments should be greater than or equal to the length of the filter minus one

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Q3. How do you obtain the in-phase and quadrature components of a real pass-band signal?

Ans.

The in-phase and quadrature components of a real pass-band signal can be obtained using a complex mixer.

  • A complex mixer is used to convert the real pass-band signal to a complex baseband signal.

  • The in-phase component is obtained by multiplying the pass-band signal with a local oscillator signal in-phase with the carrier frequency.

  • The quadrature component is obtained by multiplying the pass-band signal with a local oscillator signal 90 degrees out of phase with the carrier fre...read more

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Q4. How do you obtain the bit-rate for quantization of a band-limited signal?

Ans.

The bit-rate for quantization of a band-limited signal can be obtained by considering the Nyquist-Shannon sampling theorem.

  • The Nyquist-Shannon sampling theorem states that in order to accurately represent a band-limited signal, the sampling rate must be at least twice the highest frequency component of the signal.

  • The bit-rate for quantization is determined by the number of bits used to represent each sample. It is typically calculated as the product of the sampling rate and t...read more

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Q5. How do you implement interpolation in discrete-time domain?

Ans.

Interpolation in discrete-time domain involves estimating values between known data points.

  • Interpolation is used to fill in missing data or estimate values between known data points.

  • Common interpolation techniques include linear interpolation, polynomial interpolation, and spline interpolation.

  • Linear interpolation calculates values along a straight line between two known data points.

  • Polynomial interpolation uses a polynomial function to estimate values between data points.

  • Spl...read more

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Q6. Obtain the Nyquist sampling frequency for an unevenly distributed band-limited signal.

Ans.

Nyquist sampling frequency for unevenly distributed band-limited signal.

  • Determine the highest frequency component in the signal

  • Use Nyquist theorem to calculate the minimum sampling frequency

  • Sampling frequency should be at least twice the highest frequency component

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Q7. How do you demodulate a QAM signal?

Ans.

Demodulating a QAM signal involves separating the amplitude and phase components to recover the original data.

  • QAM signals combine amplitude and phase modulation

  • Demodulation involves separating the amplitude and phase components

  • Techniques like coherent demodulation and quadrature demodulation are used

  • Coherent demodulation uses a local oscillator to recover the phase component

  • Quadrature demodulation separates the in-phase and quadrature components

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Q8. Obtain the Nyquist criterion.

Ans.

The Nyquist criterion states that in order to accurately sample a signal, the sampling rate must be at least twice the highest frequency component of the signal.

  • The Nyquist criterion is used in digital signal processing and communication systems.

  • It ensures that the original signal can be accurately reconstructed from its samples.

  • The sampling rate should be at least twice the bandwidth of the signal to avoid aliasing.

  • For example, if a signal has a maximum frequency of 10 kHz, ...read more

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Q9. How is overlap-add implemented?

Ans.

Overlap-add is implemented by dividing the input signal into overlapping segments, applying a window function, and adding the segments together.

  • Overlap-add is a method used in digital signal processing to efficiently convolve long signals with finite impulse response (FIR) filters.

  • The input signal is divided into overlapping segments, typically with a length equal to the filter length.

  • A window function, such as the Hamming window, is applied to each segment to reduce spectral...read more

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Q10. Explain the working of D flip flop

Ans.

D flip flop is a digital circuit that stores a single bit of data and is used in sequential logic circuits.

  • D flip flop has a data input (D), a clock input (CLK), a set input (S), and a reset input (R).

  • When the clock input is high, the value of D is transferred to the output Q.

  • When the set input is high, the output Q is set to high.

  • When the reset input is high, the output Q is reset to low.

  • D flip flop is used in applications like shift registers, counters, and memory units.

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Q11. Design a 3 input xor gate using 4:1mux

Ans.

Use a 4:1 mux to create a 3 input XOR gate.

  • Connect two of the inputs to the select lines of the mux.

  • Connect the third input to one of the data inputs of the mux.

  • Connect the other data input of the mux to the output of an XOR gate between the first two inputs.

  • Use the output of the mux as the output of the 3 input XOR gate.

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Q12. Find duplicates in a string

Ans.

To find duplicates in a string, we can use a hash table to keep track of the frequency of each character.

  • Iterate through the string and add each character to the hash table with its frequency

  • If a character already exists in the hash table, it is a duplicate

  • Return a list of all the duplicate characters found

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Q13. Finding factorial using C

Ans.

Factorial can be found using a loop or recursion in C programming language.

  • Use a loop to multiply the numbers from 1 to n to find the factorial of n.

  • Use recursion to call the function itself with n-1 until n=1.

  • Handle edge cases such as negative numbers and 0.

  • Example: int factorial(int n) { if(n<=1) return 1; return n*factorial(n-1); }

  • Example: int factorial(int n) { int fact=1; for(int i=1;i<=n;i++) fact*=i; return fact; }

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Interview Process at National Australia Bank

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