Electrical and Electronics Measurements and Instrumentation Online Test 1 – Randomized MCQs

Q-1.An OPAMP having an open loop gain is designed with a loop gain (A_vol β) where β = R₁/(R₁+ R_f )   with R₁ = resistance connected to non-inverting end and  R_f = resistance connected in the feedback path, the input resistance of the amplifier (R_inf) with feedback is :

Q-2.In a kelvin’s double bridge two sets of readings are taken when measuring a low resistance, one with the current in one direction and the other with the direction of the current reversed. This is done to :

Q-3.An OPAMP having an open loop gain of A_vol is designed with feed factor β where β = R₁/(R₁+ R_f )  is the input resistance connected to non-inverting end and R is the resistance in the feedback path, the closed loop gain is :

Q-4.A unknown resistance is measured by substitution method. First a standard known resistance of 100 Ω is connected in series with a circuit having a rheostat and a galvanometer. The battery voltage is 10V and the setting of rheostat is 500 Ω and the galvanometer shows a deflection of 60°. After this test. The battery voltage goes down to 9 V and when the unknown resistance is substituted for the known resistance, the galvanometer again shows a deflection of 60° with the same setting of the rheostat. The value of unknown resistance is :

Q-5.When measuring power in a circuit with low current, the wattmeter current coil should be connected

Q-6.The gain of a 741 OPAMP falls off at a low frequency of,

Q-7.The order of output resistance of 741 OPAMP is,

Q-8.Iron losses in a specimen of iron are determined by using co-ordinate type of potentiometer. The loss component of no load current is ready by :

Q-9.A 1 mA d’Arsonval movement has a resistance of 100Ω. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is

Q-10.Swamping resistance is connected

Q-11.In an electrodynamometer type of wattmeter :

Q-12.A Kelvin-varley slide consists of 4 decade dividers. The first decade is constructed by having 11 coils of 10 kΩ resistance each. The subsequent decades will have coils of :

Q-13.A analog transducer has a range 0-10V. calculate its of an converter if the resolution is 5 mA

Q-14.for a Gaussian distribution, the probable error is r. This means that:

Q-15.PLCs are ___________ designed for use in the control of a wide variety of manufacturing machines and systems.

Q-16.Two sets of readings are taken in a Kelvin’s double bridge with the battery polarity reversed in order to

Q-17.The transducer that converts measurand into the form of pulse is called the _______ transducers.

Q-18.Braking torque provided by the permanent magnet in an induction-type energy meter is proportional to

Q-19.For a measurement of temperature

Q-20.In electrodynamometer-type wattmeters, pressure coil inductance produce error which is

Q-21.For an F.M wave represented by the voltage equation E = 8 sin (6× 10⁸t + 5 sin 4× 10⁴t) V The modulation index and the maximum deviation are:

Q-22.A ______ is commonly used for the measurement of temperature

Q-23.Capacitive transducers have the advantages of

Q-24.A capacitor is connected across a portion of resistance of the multiplier in order to make the pressure coil circuit non-inductive. The value of resistance is r while the total resistance and inductance of pressure circuit are respectively R_p and L. The value of capacitor C is:

Q-25.Turns compensation is used in current transformer primarily for reduction of :

Q-26.One of the combinations of materials used for optical fibers is :

Q-27.In a source follower type electronic voltmeter, the trans-conductance of FETs is 0.005 mho and the resistance of the meter is 100Ω. The approximate value of current through the meter, when the input voltage is 1 V, is :

Q-28.A video frequency oscillator has a frequency range of :

Q-29.A pressure applied to a bellows element produces a linear displacement of 2 mm. supposes the number of bellows elements is made 3 times and the thickness of bellows element is halved, what would be the displacement of the element for the same applied pressure?

Q-30.In Measurement systems, which of the following characteristics are undesirable static Characteristics?