Explore topic-wise MCQs in Engineering.

An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is

Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.

Reason (R): A wattmeter measures apparent power.

Figure shows an RC potentiometer to measure ac voltage. It is desired that V₀/V_i should be independent of frequency. The value of C should be

In the amplifier circuit of figure h_fe = 100 and h_ie = 1000 Ω. The voltage gain of amplifier is about

Negative feedback reduces noise originating at the amplifier input.

The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.

Assertion (A): For large signal variations an amplifier circuit has to be analysed graphically

Reason (R): The output characteristics of a transistor is nonlinear.

For a system to work, as oscillator the total phase shift of the loop gain must be equal to

Assertion (A): CE amplifier is the most widely used BJT amplifier

Reason (R): CE amplifier has zero phase difference between input and output

In a CE amplifier the input impedance is equal to the ratio of

The output V₀ in figure is

The transistor of following figure in Si diode with a base current of 40 A and I_CBO = 0, if V_BB = 6V, R_E = 2 kΩ and = 90, I_BQ = 20 A then R_B =

Maximum efficiency of class B power amplifier is 50%.

In figure what is the base current if V_BE = 0.7 V

In figure I_D = 4 mA. Then V_S =

The self bias provides

In figure what is value of I_C if _dc = 100. Neglect V_BE

An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a

Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?

In which of the transformer is the secondary nearly short circuited under normal operating conditions?

In figure The minimum and maximum load currents are

In figure, V_EB = 0.6 V, = 99. Then V_C and I_C are

Assertion (A): De sauty's bridge is suitable only for pure capacitor.

Reason (R): Capacitors are mostly perfect.

The system in the given figure, has

The given figure shows a pole zero diagram. The transfer function G(j1) is

For very low frequencies, v₀/v_i in the given figure equals

In a minimum phase system

In the given figure, if R = X_C, voltage gain is

For the control system in the given figure, the value of K for critical damping is

For the system in the given figure,

For the system of the given figure the transfer function is

For the circuit in the given figure, V₂(s)/V₁(s) =

For the given figure C(s)/R(s)

In the given figure shows pole-zero plot. If steady state gain is 2 the transfer function G(s) is

A stepper motor is

A unity feedback system has open loop transfer function The closed loop transfer function is

Consider the systems with following open loop transfer functions

The phase margin and damping ratio have no relation.

For the transport lag G(j ) = e^{-j T}, the magnitude is always equal to

The log magnitude curve for a constant gain K is a

The compensator of the given figure is a

If a system is to follow arbitrary inputs accurately the bandwidth should be

For the system of the given figure, the damping ratio of closed loop poles is

Assertion (A): Potentiometers can not be used as error detectors in position control systems.

Reason (R): The resolution of a potentiometer places an upper limit on its accuracy

From the noise point of view, bandwidth should

Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by j

When a unit step voltage drives a lag network the output

For the given figure C(s)/R(s)

Bellows converts

A system has its two poles on the negative real axis and one pair of poles lies on j axis. The system is