Recent questions and answers in Instrumentation and control

0 answers 75 views
1 answer 17 views

Which one of the following frequency meter is suitable for measuring radio frequency?   (a) Vibrating reed frequency meter (b) Weston frequency meter (c) Electrical resonance frequency meter (d) Heterodyne frequency meter 

answered May 13, 2018 in Instrumentation and control
1 answer 22 views

Which of the following factors limit the deflection of the pointer of a PMMC instrument of about 90o?  1. Its damping mechanism  2. Linearity of magnetic field in which the coil moves  3. Control spring arrangement  4. Shape of pole shoe for the horse shoe magnet   Select the correct answer using the code given below:   (a) Only 1 and 3 (b) Only 2 and 4 (c) Only 2 and 3 (d) Only 1 and 4 

answered May 13, 2018 in Instrumentation and control
1 answer 9 views

Torque/weight ratio of an instrument indicates   (a) Selectivity (b) Accuracy (c) Fidelity (d) Sensitivity

answered May 13, 2018 in Instrumentation and control
1 answer 79 views

Wagner's earth devices are used in AC bridge circuits for (a) Eliminating the effect of earth capacitances (b) Eliminating the effect of intercomponent capacitances (c) Eliminating the effect of stray electrostatic fields (d) Shielding the bridge elements

answered May 13, 2018 in Instrumentation and control
1 answer 8 views

Loading effect is principally caused by instruments   (a) High resistance (b) Low sensitivity (c) High sensitivity (d) High range

answered May 13, 2018 in Instrumentation and control
1 answer 25 views

Thermocouple instruments can be used for a frequency range upto   (a) 100Hz (b) 5000 Hz (c) 1 MHz (d) 50 MHz and above 

answered May 13, 2018 in Instrumentation and control
1 answer 9 views

In a single phase induction energy meter, in order to obtain true value of energy, the shunt magnetic flux should lag behind the applied voltage by   (a) 90o (b) 0o (c) 45o (d) 60o

answered May 13, 2018 in Instrumentation and control
1 answer 11 views

Gearing, blacklash, friction between moving parts and scale accuracies are generally known as  (a) Instrument errors (b) Interference errors (c) Calibration errors (d) Interaction errors

answered May 13, 2018 in Instrumentation and control
1 answer 19 views

If the distance of screen from a CRT to center of deflection plates is 15 cm, the length of deflection plates is 2 cm, the distance between the plates is 1 cm and accelerating voltage is 500 V, deflection sensitivity is   (a) 33.2 V/cm (b) 0.03 cm/V (c) 66.4 V/cm (d) 0.015 cm/V

answered May 13, 2018 in Instrumentation and control
1 answer 29 views

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

answered Apr 25, 2018 in Instrumentation and control
1 answer 47 views

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

answered Apr 25, 2018 in Instrumentation and control
1 answer 23 views

If stator field is rotating in clockwise direction rotor rotates in (A) any direction (B) cannot predict (C) anticlockwise (D) clockwise 

answered Apr 23, 2018 in Instrumentation and control
1 answer 28 views

What is the line current of a circuit when the current transformer of 1000 : 5 rating measures 4 amp? (A) 5000 amp (B) 1000 amp (C) 400 amp (D) 800 amp 

answered Apr 23, 2018 in Instrumentation and control
1 answer 11 views

What is the vector location of TRAP interrupt? (A) 0000 h (B) 0008 h (C) 0014 h (D) 0024 h

answered Apr 23, 2018 in Instrumentation and control
1 answer 12 views

An amplifier has a voltage gain of 50; this gain in dB will be (A) 34 dB (B) 68 dB (C) 41 dB (D) 14 dB 

answered Apr 23, 2018 in Instrumentation and control
1 answer 8 views

Converter is a device for transforming (A) ac to dc (B) dc to dc (C) dc to ac (D) ac to ac

answered Apr 23, 2018 in Instrumentation and control
1 answer 9 views

The input frequency is 50 Hz. The ripple frequency in a 12 phase full wave rectifier is (A) 1200 Hz (B) 600 Hz (C) 100 Hz (D) 50 Hz 

answered Apr 23, 2018 in Instrumentation and control
1 answer 11 views

The grid in triodes is made in the form of (A) mesh (B) metal strip (C) metallic cylinder (D) single filament wire 

answered Apr 23, 2018 in Instrumentation and control
1 answer 15 views

The 555 timer can be used in which of the following configurations ?  a) astable, monostable b) monostable, bistable c) astable, toggled d) bistable, tristable

answered Apr 14, 2018 in Instrumentation and control
1 answer 43 views

The dc current through each diode in a bridge rectifier equals : - a) the load current b) half the dc load current c) twice the dc load current d) one-fourth the dc load current

answered Apr 14, 2018 in Instrumentation and control
1 answer 16 views

Intrinsic semiconductor material is characterized by a valence shell of how many electrons? a) 1 b) 2 c) 4 d) 6

answered Apr 14, 2018 in Instrumentation and control
1 answer 19 views

Sample -and -hold circuits in ADCs are designed to : - a) sample and hold the output of the binary counter during the conversion process b) stabilize theAD Cs threshold c) voltage during the conversion process stabilize the input analog d) signal during the conversion process sample and hold the ADC staircase waveform during the conversion process

answered Apr 14, 2018 in Instrumentation and control
1 answer 20 views

Base 10 refers to which number system? a) binary coded decimal b) decimal c) octal d) hexadecimal

answered Apr 14, 2018 in Instrumentation and control
1 answer 20 views

A basic S -R flip-flop can be constructed by cross -coupling which basic logic gates : - a) AND or OR gates b) XOR or XNOR gates c) NOR or NAND gates d) AND or NOR gates

answered Apr 14, 2018 in Instrumentation and control
1 answer 43 views

A zero -level detector is a - a) comparator with a sine wave output b) comparator with a trip point referenced to zero c) peak detector d) limiter

answered Apr 14, 2018 in Instrumentation and control
1 answer 18 views

A single transistor can be used to build which of the following digital logic gates : - a) AND gates b) OR gates c) NOT gates d) NAND gates

answered Apr 14, 2018 in Instrumentation and control
1 answer 16 views

The maximum phase lead is contributed by a phase lead network at: - a) mid corner frequency b) lower corner frequency c) upper corner frequency d) phase corner frequency

answered Apr 14, 2018 in Instrumentation and control
1 answer 19 views

With a 12 V supply, a silicon diode, and a 370 - ohm resistor in series, what voltage will be dropped across the diode? a) 0.3V b) 0.7V c) 0.9V d) 1.4V

answered Apr 14, 2018 in Instrumentation and control
1 answer 9 views

Which of the following describes the operation of a positive edge - triggered D -type flip-flop? a) if both inputs are HIGH, the output will toggle b) the output will follow the input on the leading edge of the clock c) - when both inputs are LOW, an invalid state exists d) the input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.

answered Apr 14, 2018 in Instrumentation and control
1 answer 12 views

The polarity of induced voltage while a field is collapsing is : - a) independent of the force creating the field b) opposite to the force creating c) the field identical to the force creating d) the field present only if the force is stationary

answered Apr 14, 2018 in Instrumentation and control
1 answer 18 views

The basic logic gate whose output is the complement of the input is the: - a) OR gate b) AND gate c) inverter d) comparator

answered Apr 14, 2018 in Instrumentation and control
1 answer 11 views

The output of an AND gate with three inputs, A, B and C, is HIGH when __________. a) A=1,B=1,C=0 b) A= 0,B= 0,C= 0 ' c) A=1,B=1,C=1 d) A=1,B= 0,C= 1

answered Apr 14, 2018 in Instrumentation and control
1 answer 14 views

Convert hexadecimal value 16 to decimal: - a) 2210 b) 1610 c) 1010 d) 2010

answered Apr 14, 2018 in Instrumentation and control
1 answer 13 views

How many bits are needed to address 64 K memory: - a) 3 b) 10 c) 16 d) 32

answered Apr 14, 2018 in Instrumentation and control
1 answer 12 views

Which of the following flip-flop do not have race problem ? a)T flip-flop b) D flip-flop c) JK flip-flop d) Master Slave flip-flop

answered Apr 14, 2018 in Instrumentation and control
1 answer 9 views

The ASCII is an input output code : - a) it is a two bit code b) it is a four bit code c) it is a seven bit code d) it is a eight bit code

answered Apr 14, 2018 in Instrumentation and control
1 answer 6 views

LED emits light : - a) only in RED color b) only in YELLOW color c) only in GREEN color d) In RED, GREEN, YELLOW and AMBER color

answered Apr 14, 2018 in Instrumentation and control
1 answer 10 views

Wait status can be achieved in 8085 microprocessor by : - a) TRAP b) DMA c) HOLD d) INTR

answered Apr 14, 2018 in Instrumentation and control
1 answer 8 views

 Damping torque used in energy meter is : - a) Electrostatic b) Electro magnetic c) Eddy Current d) None

answered Apr 14, 2018 in Instrumentation and control
1 answer 41 views

Thermocouple is used to measure : - a) AC b) DC c) Both d) None

answered Apr 14, 2018 in Instrumentation and control
1 answer 421 views

 Moving coil in dynamometer wattmeter connected : - a) in series with fixed coil b) across supply c) in series with load d) across load

answered Apr 14, 2018 in Instrumentation and control
1 answer 17 views

 A 0 -10 mAPMMC ammeter reads 5 mA in a circuit; its bottom control spring snaps out suddenly the meter will now read:- a) 5 mA b) 10 mA c) 2.5 mA d). 0

answered Apr 14, 2018 in Instrumentation and control
1 answer 19 views

In a thyristor Latching current is than holding current: - a) equal b) less c) greater d) none of the above

answered Apr 14, 2018 in Instrumentation and control
1 answer 5 views

 Thermocouples are_____ transducer whereas thermistor are_____ transducer. a) passive, active b) active, passive c) active, active d) passive, passive

answered Apr 14, 2018 in Instrumentation and control
1 answer 11 views

A thermistor is generally a semiconductor material exhibits: a) Positive Temperature co -efficient b) Negative Temperature co -efficient c) Neither positive nor negative temperature co -efficient d) both (a) and (b)

answered Apr 14, 2018 in Instrumentation and control
1 answer 30 views

The Q factor of a coil at resonant frequency 1.5 MHz of an RLC series circuit is 150. The Bandwidth is : - a) 225 MHz b) 1.06 MHz c) 10 KHz d) 10 MHz

answered Apr 14, 2018 in Instrumentation and control
1 answer 10 views

A Voltage Controlled Oscillator (VCO) is an instrument : - a) whose frequency is dependent upon the amplitude of input signal b) whose frequency is independent upon the amplitude of input signal c) whose frequency is dependent upon the frequency of input signal d) none of the above

answered Apr 14, 2018 in Instrumentation and control
1 answer 8 views

In signal generators - a) energy is created b) energy is generated c) energy is converted from a simple DC source into ac energy at some specific frequency d) all the above

answered Apr 14, 2018 in Instrumentation and control
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