Explore topic-wise MCQs in Engineering.

For the circuit in the given figure,

In Bode diagram (log magnitude plot) the factor in the transfer function gives a line having slope

A negative feedback system has . The closed loop system is stable for

Stepper motors find applications in

For type 2 system, the magnitude and phase angle of the term (j )² in the denominator, at = 0, are respectively

A lag compensator is essentially a

In an integral controller

The input impedance of op-amp circuit of figure is

The load impedance Z_L of a CE amplifier has R and L in series. The phase difference between output and input will be

Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be

In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit

To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use

An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with = 0.1 is used, the lower cut off frequency will be

If an amplifier with gain of - 1000 and feedback factor = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be

In a ballistic galvanometer, a charge of 100 C gives a first swing of 25 . The charge required to cause first swing of 50 is

Two resistors R₁ = 36 Ω 5% and R₂ = 75 Ω 5% are connected in series. The total resistance is

Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?

Induction wattmeter can be used in

In a thermocouple temperature transducer, the output voltage is usually measured by

A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be

A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is

A moving iron instrument gives correct reading when used at

Whether a linear system is stable or unstable that it

For the system of the given figure the transfer function =

To prevent a DC return between source and load, it is necessary to use

For a base current of 10 A, what is the value of collector current in common emitter if _dc = 100

Which of the following oscillators is suitable for frequencies in the range of mega hertz?

If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of

In a CRO which of the following is not a part of electron gun

The rms value of wave in figure is

An RLC series circuit is underdamped. To make it overdamped, the value of R

Henry is equivalent to

In a parallel resonant circuit, the circuit current at resonance is maximum.

If a piece of wood is placed in a magnetic field

The number of valence electrons in donor impurity are

The apparent capacitance at a high angular frequency of an air cored capacitor having capacitance C and inductance L is given by

In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.

The number of valence electrons in pentavalent impurity is

If the diameter of a wire is doubled, its current carrying capacity becomes

Which of the following are donor impurities?

1. Gold
2. Phosphorus
3. Boron
4. Antimony
5. Arsenic
6. Induim

Assertion (A): Silicon is less sensitive to changes in temperature than germanium.

Reason (R): Cut in voltage in silicon is less than that in germanium.

If n denotes principal quantum number, the angular quantum number l = 0, 1... (n - 1).

Which element exhibits the property of inertia?

For a permanent magnetic material

In a coaxial cable, braided copper is used for

A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90 .

Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ^'_r - j ^"_r.

In atomic physics, a state with l = 0 is called p state.

Assertion (A): From the slope of the line in Figure, we can find permanent dipole moment of the molecules.

Reason (R): Total polarization of a polyatomic gas is given by P = N(a_e + a_i + ²_p / 3kT)E.

Assertion (A): If E is available energy state eV and E_F is Fermi level, then probability of energy state E being occupied = 0.5.

Reason (R): .