WorksheetsEngineering Quiz
Total questions: 30
Worksheet time: 15mins
The fundamental frequency in Fourier series of a function with period T is:
1/T
T
2π/T
2Πt
In least squares method for straight line fitting, the sum minimized is:
Σ(yi - ŷi)
Σ|yi - ŷi|
Σ(yi - ŷi)²
Max|yi - ŷi|
For large sample test of single proportion, the test statistic follows:
t-distribution
Normal distribution
Chi-square distribution
F-distribution
In small sample t-test for single mean, degrees of freedom is:
n
n-1
n-2
n+1
TRUE/FALSE: Chi-square test requires expected frequency in each cell to be at least 5.
TRUE
FALSE
Wien bridge oscillator frequency is determined by:
LC circuit
RC circuit
Crystal
Transformer
Monostable multivibrator has:
No stable state
One stable state
Two stable states
Three stable states
RC differentiator produces output proportional to:
Input
Integral of input
Derivative of input
Square of input
Class AB amplifier is used to eliminate:
Harmonic distortion
Crossover distortion
Intermodulation distortion
Phase distortion
TRUE/FALSE: UJT (Unijunction Transistor) has two PN junctions.
TRUE
FALSE
DTFT exists if the sequence is:
Absolutely summable
Square summable
Bounded
Periodic
Final value theorem for Z-transform states:
lim[n→∞] x[n] = lim[z→1] X(z)
lim[n→∞] x[n] = lim[z→1] (z-1)X(z)
lim[n→∞] x[n] = lim[z→0] X(z)
lim[n→∞] x[n] = lim[z→∞] X(z)
For LTI system, output y[n] = h[n] * x[n], where * denotes:
Multiplication
Convolution
Correlation
Addition
DFT of N-point sequence has:
N points
N-1 points
2N points
Infinite points
TRUE/FALSE: State space representation of a system is unique.
TRUE
FALSE
Phase margin is the additional phase lag at:
Phase crossover frequency
Gain crossover frequency
Corner frequency
Natural frequency
In Routh-Hurwitz criterion, system is stable if:
All elements in first column are positive
All elements in first row are positive
All elements are positive
Determinant is positive
Nyquist stability criterion is based on:
Mapping theorem
Argument principle
Residue theorem
Cauchy theorem
In digital control systems, for stability poles must lie:
Inside unit circle
Outside unit circle
On unit circle
At origin
TRUE/FALSE: Root locus always starts from open-loop poles.
TRUE
FALSE
BCD adder adds two:
Binary numbers
4-bit BCD numbers
Decimal numbers directly
Hexadecimal numbers
Priority encoder gives output corresponding to:
Lowest priority input
Highest priority input
Average of all inputs
Sum of all inputs
A 4:1 multiplexer requires:
2 select lines
4 select lines
1 select line
3 select lines
EEPROM can be erased using:
UV light
X-rays
Electrical signals
Heat
TRUE/FALSE: Johnson counter with n flip-flops has 2n states.
TRUE
FALSE
Shot noise in electronic devices is due to:
Temperature variations
Discrete nature of current flow
Bandwidth limitations
Impedance mismatch
In AM system, modulation index greater than 1 causes:
Improved reception
Overmodulation
Better S/N ratio
Increased bandwidth
CW Doppler radar detects:
Range only
Velocity only
Both range and velocity
Neither range nor velocity
In color television, chrominance signal carries:
Brightness information
Color information
Synchronization information
Audio information
TRUE/FALSE: Pre-emphasis in FM increases high frequency components before transmission.
TRUE
FALSE
