Instrumentation Multiple Choice Questions Answers PDF

1. A recorder

(a) is an indicating instrument which displays a time varying signal.
(b) is a device whose function is to record the value of quantity as it is being measured.
(c) records electrical and non-electrical quantities as a function of time or relates two signals to each other.
(d) both (b) and (c).

2. Strip-chart recorders have the advantage(s) of

(a) long period run.
(b) more actually usable width.
(c) possibility of change in chart speed simply by lever actions.
(d) uniform resolution.
(e) all of the above.

3. The zero-suppression in recorders implies

(a) recording signals with reference to a point other than the zero.
(b) removing the static component so that rest of the signal is displayed with more expansion.
(c) providing inertialess components to improve transient response.
(d) designing the recorder for zero error.

4. Galvanometer type recorders use

(a) vibration galvanometer.
(b) ballistic galvanometer.
(c) D’Arsonval galvanometer.
(d) tangent galvanometer.

5. Galvanometer used in recorders is

(a) an ordinary D’Arsonval galvanometer.
(b) somewhat different from the ordinary D’Arsonval galvanometer.
(c) a D’Arsonval galvanometer with large moving coil, strong magnetic field and critical damping.
(d) a D’Arsonval galvanometer with large moving coil, weak Magnetic field and critical damping.
(e) both (b) and (c).

6. Null type recorders are………….recorders.

(a) potentiometric
(b) bridge
(b) LVDT
(d) any of the above.

7. The poteritiometric recorders have the advantage(s) of

(a) very high input impedance.
(b) high sensitivity.
(c) high response to rapidly changing quantities.
(d) both (a) and (b).

8. The main drawback of balancing recorders is that

(a) their ability to respond to rapidly changing quantities is quite limited.
(b) low input impedance.
(c) low input sensitivity.
(d) none of these.

9. The advantages of x-y recorders are that

(a) they are economical to operate.
(b) they are easy and convenient to use.
(c) they are cheaper than strip-chart recorders.
(d) they can be conveniently used for continuous recording.
(e) both (a) and (b).

10. The recorders used for plotting B-H curves for magnetic materials, current-voltage curves for transistors and speed-time curves for electric motors are……….recorders.

(a) LVDT type
(b) circular chart
(c) x-y
(d) potentiometer type

11. The recording head in a magnetic tape responds to

(a) electrical signal and creates a magnetic signal.
(b) thermal signal and creates a magnetic signal.
(c) magnetic signal and creates an electrical signal.
(d) thermal signal and creates an electrical signal.

12. Consider the following statements regarding magnetic tape recorders.

1. They have a wide frequency range.
2. They have low distortion.
3. The storage of data is volatile.

Of these statements
(a) 1, 2 and 3 are correct.
(b) 1 and 2 are correct.
(c) 2 and 3 are correct.
(d) 1 and 3 are correct.

13. In a magnetic tape blanks are provided at the

(a) start of the tape.
(b) middle of the tape.
(c) end of the tape.
(d) start and end of the tape.

14. The main drawback of direct recording is

(a) complicated circuitry.
(b) poor signal-to-noise ratio.
(c) poor reliability.
(d) limited high frequency response.

15. The direct recording is mainly used

(a) for recording the speech and music.
(b) for recording voltages from the pressure, force and acceleration transducers.
(c) for multiplexing in instrumentation.
(d) for simultaneous recording of a large number of slowly changing variables.

16. The advantages of FM magnetic tape recording are

(a) it can record from dc to several kHz.
(b) it is free from dropout effects.
(c) it is independent of amplitude variations and reproduces the waveform of the input signal accurately.
(d) all of the above.

17. The digital tape recording has the advantage(s) of

(a) giving highly accurate results.
(b) insensitivity to speed of tape.
(c) need of a simple data conditioner.
(d) feeding information directly to digital computers for processing and control.
(e) all of the above.

18. Continuous recording of a signal is not possible in a

(a) magnetic tape recorder.
(b) strip chart recorder.
(c) X-Y recorder.
(d) Galvanometric recorder.

19. The sensitivity of an ECG is typically

(a) 1 cm/V.
(b) 0.1 cm/V.
(c) 10 mm/mV.

20. The main shortcomings of diaphragms are that

(a) they are difficult to repair.
(b) they are prone to shock vibrations.
(c) poor stability and reliability.
(d) high hysteresis and creep.
(e) both (a) and (b).