NE/SE555 Timer

µA741C

UJT (2N-2646)

Thermistor

non-inverting amplifier

inverting amplifier

op-amp voltage follower

non-inverting adder

± 0.7 V

± 6 V

± Vsat

± 0.3 V

quality factor Q = f_c / (f_H−f_L)

bandwidth = (f_H−f_L)

central frequency f_c = (f_H + f_L)/2

central frequency f_c = √(f_H .f_L)

low-pass

band-pass

high-pass

all-pass

I_o = I_ref

I_o = β I_ref

(β+2) I_o = β I_ref

(β+1) I_o = β I_ref

D = R_B / (R_A + R_B)

f = 1.45 / (R_A+2 R_B) C

D = R_B / (R_A+ 2 R_B)

T = 0.7 (R_A+2 R_B) C

less

more

equal

can't be determined

reducing minor lobes

increasing directivity

for matching antenna with transmission line

increasing half power beamwidth

TM

TE

TEM

unpredictable

all the elements of the array must be excited with the same phase

all the elements of the array must be excited with the progressive phase of $\pi/2$

all the elements of the array must be excited with the same different amplitude

all the elements of the array must be excited with the progressive phase of $\pi/4$

the phase of excitation must be equal to the K (wavenumber) times d, the spacing of the elements

the phase of excitation must be less than the K (wavenumber) times d, the spacing of the elements

the phase of excitation must be greater than the K (wavenumber) times d, the spacing of the elements

the spacing between the elements must be multiple of wavelength.

Velocity of the target

range of the target

both velocity and range of the target

neither range nor velocity of the target

Inceasing the threshold voltage of detection of radar increases probabilty of detection

Inceasing the threshold voltage of detection of radar decreases probabilty of detection

Inceasing the threshold voltage of detection of radar does not change probabilty of detection

Inceasing the threshold voltage of detection of radar does not change probabilty of false alarm

Baseband power spectral density of binary PSK signal equals S_B (f)=2E_b sinc²(Tb/f).

Baseband power spectral density of binary PSK signal equals S_B (f)=2E_b sinc²(2T_bf).

Baseband power spectral density of binary PSK signal equals S_B (f)=2E_b sinc²(T_bf).

A coherent QPSK system transmits information at half the bit rate of a coherent binary PSK system for the same channel bandwidth.

A coherent QPSK system transmits information at twice the bit rate of a coherent binary PSK system for the same channel bandwidth.

A coherent PSK system transmits information at equal bit rate of a coherent binary QPSK system for the same channel bandwidth.

The offset QPSK has exactly the same probability of symbol error in an AWGN channel as QPSK.

The offset QPSK has twice the probability of symbol error in an AWGN channel as QPSK.

The QPSK has twice the probability of symbol error in an AWGN channel as Offset QPSK.

The minimum distance of a linear block code is the largest Hamming weight of the nonzero code vectors in the code.

The minimum distance of a linear block code is the smallest Hamming weight of the nonzero code vectors in the code.

The maximum distance of a linear block code is the maximum Hamming weight of the nonzero code vectors in the code.

An (n, k) cyclic code is uniquely specified by the generator polynomial of degree k.

An (n, k) cyclic code is uniquely specified by the parity-check polynomial of degree (n-k).

An (n, k) cyclic code is uniquely specified by the parity-check polynomial of degree k.

The PSK may be viewed as the noncoherent version of DPSK.

The QPSK may be viewed as the noncoherent version of PSK.

The DPSK may be viewed as the noncoherent version of PSK.

The advantages of PCM are attained at the cost of increased system complexity.

The advantages of PCM are attained at the cost of speed.

The advantages of PCM are attained with no increased system complexity.

The increased bandwidth requirement of PCM will remain a concern always.

The increased bandwidth requirement of PCM is still a concern now.

The increased bandwidth requirement of PCM was a concern in the past.

the edge of the depletion region on the p-side

the edge of the depletion region on the n-side

the p-n junction

the centre of the depletion region on the n-side

tunnelling of charge carriers across the junction

thermionic emission

diffusion of charge carriers across the junction

hopping of charge carriers across the junction

increases by 60 mV

decreases by 60 mV

increases by 25 mV

decreases by 25 mV