Explore topic-wise MCQs in Engineering.

A first order system will never be able to give a __________ response

1. band stop
2. band pass
3. all pass

In the given figure the ratio T/d is the duty factor.

The amplitude of a pair of composite sinusoidal signal y(n) = x₁(n) + x₂(n) with x₁(n) = sin (5pn) x₂(n) = 3 sin (5pn) is __________ .

For a = - 1, find the value of V₂

A n-channel JFET has I_DSS = 2 mA, Gate to source voltage V_GS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .

In the circuit below, delay of the EXOR and AND


Logic gates are 20 s and 10 s respectively, then the wave y^' and y (with initial condition y = 1) will be :

A unity-feedback control system has the open loop transfer function . If the input system is a unit ramp, the steady state error will be

For a given voltage, four heating coils will produce maximum heat when connected

The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

If the system T.F. is The differential equation representing the system is

Denominator polynomial of a transfer function of certain network is:
s³ + s² + 2s + 24
Then the network is:

Consider the signal flow graph shown in figure below. The gain is :

During transmission over a communicate channel, bit errors occur independently with probability . If a block of 3 bits are transmitted, the probability of at most one bit error is equal to

When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

The gradient of any scalar field always yields __________ .

In a flash type ADC, employing 15 comparators resolution with 10 volts reference; is expected to be :

Find 'X' in the circuit below :

f₁(A, B, C, D) = (6, 7, 13, 14);
f₂(A, B, C, D) = (3, 6, 7);
f₃(A, B, C, D) = (5, 6, 7, 14, 15)

Consider the common emitter amplifier shown below with the following circuit parameters: = 100, g_m = 0.3861 A/V, r₀ = r_p = 259 , R_s = 1 k , R_B = 93 k , R_C = 250 , R_L = 1 kW, C₁ = and C₂ = 4.7mF.

The resistance seen by the source Vs is

If the power spectral density of stationary random process is a sine-squared function of frequency, the shape of its autocorrelation is

Consider the amplitude modulated (AM) signal A_c cos _ct + 2 cos _mt cos _ct For demodulating the signal using envelope detector, the minimum value of A_c should be

The normal operation of JFET is

What is the propagation constant for air filled wave guide with dimensions a = 1.59" and b = 0.795" at 4.95 GHz?

Which of the following is true as regards photo emission?

Calculate the stability factor and change in I_C from 25 C to 100 C for, = 50, R_B/ R_E = 250, I_C0 = 19.9 nA for emitter bias configuration.

The power dissipation in a transistor is the product of

The minority carrier life time and diffusion constant in a semiconductor material are respectively 100 microsecond and 100 cm²/sec. The diffusion length is

A periodic voltage has following value for equal time intervals changing suddenly from one value to next... 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. Then rms value of the waveform is

Work function of oxide coated cathode is much lower than that of tungsten cathode.

The word enhancement mode is associated with

Secondary emission is always decremental.

In a degenerate n type semiconductor material, the Fermi level,

The types of carriers in a semiconductor are

A potential of 7 V is applied to a silicon diode. A resistance of 1 K ohm is also in series with the diode. The current is

In which region of a CE bipolar transistor is collector current almost constant?

Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20 C and 32 nA at 50 C.

Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10 C rise in temperature.

A zener diode is used in

A particular green LED emits light of wavelength 5490, , the energy bandgap of the semiconductor material used there is .. h = 6.6 x 10^-34 J sec.

Recombination produces new electron-hole pairs

An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is

Assertion (A): When a high reverse voltage is applied to a p-n junction the diode breaks down.

Reason (R): High reverse voltage causes Avalanche effect.

An LED has a rating of 2 V and 10 mA. It is used along with 6V battery. The range of series resistance is

The number of doped regions in PIN diode is

At very high temperatures the extrinsic semi conductors become intrinsic because

The displacement flux density at a point on the surface of a perfect conductor is = 2(a_x - 3 a_z)c/m² pointing away from the surface. The charge density at that point c/m² will be

When a voltage is applied to a semiconductor crystal then the free electrons will flow.

In a bipolar transistor the barrier potential

A silicon (PN) junction at a temperature of 20 C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40 C for the same bias is approximately.

Find the noise factor for an antenna at 27 C with equivalent noise temperature 30 K

Characteristic impedance of a transmission line is 50 Ω. Input impedance of the open circuited line.
Z_oc = 100 + J150 Ω. When transmission line is short circuited, then value of the input impedance will be

What is the characteristic impedance at 10 MHz?