Recent questions tagged gate1994-ec

A pulse having a rise time of $40 \mathrm{n \; sec}$ is displayed on a $\text{CRO}$ of $12 \; \mathrm{MHz}$ bandwidth. The rise time of the pulse as observed on the $\tex...

The frequency compensation is used in $\text{op-amps}$ to increase its __________.

A $2 \; \mu \; \mathrm{sec}$ pulse can be strecthed into a $10 \mathrm{~m \; sec}$ pulse by using a ________ circuit.

Synchronous counters are __________ than the ripple counters.

A ring oscillator consisting of $5$ inverters is running at a frequency of $1.0 \; \mathrm{MHz}$. The propagation delay per gate is_________ $n \; \mathrm{sec}$.

A $10 \; \mathrm{MHz}$ carrier is frequency modulated by a sinusoidal signal of $500 \; \mathrm{hz}$, the maximum frequency deviation being $50 \; \mathrm{kHz}$. The band...

The bandwidth required for the transmission of a $\text{PCM}$ signal increases by a factor of _________ when the number of quantization levels is increased from $4$ to $6...

A load impedance, $(200+\mathrm{jo}) \; \Omega$ is to be matched to a $50 \; \Omega$ lossless transmission line by using a a quarter wave line transformer $\text{(QWT)}$....

The interior of a $\frac{20}{3} \mathrm{~cm} \times \frac{20}{4} \mathrm{~cm}$ rectangular wave guide is completely filled with a dielectric of $\varepsilon_{r}=4$. Waves...

$Z(s)=\frac{5}{s^{2}+4}$ represents the input impedance of a network.

Tachometer feedback in $a d.c$. position control system enhances stability.

If $G(s)$ is a stable transfer function, then $F(s)=\frac{1}{G(s)}$ is always a stable transfer function.

A $p$-type silicon sample has a higher conductivity compared to an $n$-type sample having the same dopant concentration.

Channel current is reduced on application of a more positive voltage to the gate of a depletion mode $n$-channel $\text{MOSFET}$.

The look-ahead carry adder is a parallel carry adder where all sum digits are generated directly from the input digits.

In the output stage of a standard $\text{TTL}$, have a diode between the emitter of the pull-up transistor and the collector of the pull-down transistor. The purpose of t...

Pulse-width modulated signals are immune to noise since their amplitude is constant.

Noise figure of an amplifier is always greater than $1$ .

If a pure resistance load, when connected to a lossless $75$ – ohm line, produces a $\text{VSWR}$ of $3$ on the line, then the load impedance can only be $25$ ohms.

(A) $a_{1} \frac{d^{2} y}{d x^{2}}+a_{2} y \frac{d y}{d x}+a_{3} y=a_{4}$(B) $a_{1} \frac{d^{3} y}{d x^{3}}+a_{2} y=a_{3}$(C) $a_{1} \frac{d^{2} y}{d x^{2}}+a_{2} x \frac...

The response of an $\text{LCR}$ circuit to a step input is If the transfer function has(1) poles on the(A) over damped negative real axis(2) poles on the(B) critically da...

(A) Very low response at very high frequencies(B) Over shoot(C) Synchro-control transformer outputLow-pass systemsVelocity dampingNatural frequencyPhase-sensitive modulat...

(A) The current gain of a $\text{BJT}$ will be increased if(B) The current gain of a $\text{BJT}$ will be reduced if(C) The break-down voltage of a $\text{BJT}$ will be r...

(A) Hartley(1) Low frequency oscillator(B) Wien-bridge(2) High frequency oscillator(C) Crystal(3) Stable frequency oscillator (4) Relaxation frequency oscillator (5) Nega...

Type of $\mathrm{ADC}$(A) Successive approximation(1) $1$(B) Dual-slope(2) $8$(C) Parallel Comparator(3) $16$ (4) $256$ (5) $512$ Maximum conversion for $8$-bit $\text{AD...

(a) Single side band(1) Envelope detector(b) Amplitude(2) Integrate and dump modulation(c) Binary phase-shift(3) Hilbert transform keying (4) Ratio detector (5) Phase-loc...

(A) $\overrightarrow{\mathrm{V}} \times \overrightarrow{\mathrm{H}}=\overrightarrow{\mathrm{J}}$(1)Continuity equation(B) $\int_{c} \vec{E} \cdot \overrightarrow{a_{t}}=-...