1. In digital readout (hybrid) instruments, the reading is displayed
(A) On LCD screen in the form of digits
(B) In the form of digits on LCD/LED screen and also by pointer on scale
(C) By pointer on soft scale
(D) On LED screen in the form of digits
2. In electrical labs/shops, mostly used instrument is
(A) Digital voltmeter
(B) All these
(C) Digital multi-meter
(D) Digital ampere meter
3. Advantage of digital instruments as compared to analogue instruments
(A) All these
(B) There is no problem of zero adjustment in digital instruments
(C) Digital instruments are free from frictional error
(D) Digital instruments are free from parallax error
4. A digital volt meter can accurately measure voltage up to
(A) One millionth of a volt
(B) One hundredth of a volt
(C) One thousandth of a volt
(D) One tenth of a volt
5. This is a disadvantage of digital instrument
(A) These can be used in vertical position only
(B) Cannot change polarity automatically
(C) Resolution is low
(D) More effected by temperature and humidity
6. This is an advantage of digital instruments
(A) Have simple circuits
(B) These can hold data
(C) Repair is easy and cheaper
(D) Sampling rate is high
7. Function of transducer unit in digital instruments is
(A) To change a physical quantity into electrical signal
(B) To improve/increase the input signal
(C) To attenuate the input signal
(D) To count the pulses of input signal
8. With the help of this unit, digital instruments can also measure non electrical quantities.
(A) Analogue to digital conversion unit
(B) Attenuator unit
(C) Counter unit
(D) Transducer unit
9. The function of signal preparation unit in digital instruments is
(A) Both a & b
(B) To amplify the input signal
(C) To convert analogue signal into digital signal
(D) To attenuate the input signal
10. Basically, a digital voltmeter is a
(A) Amplifier circuit
(B) Analogue to digital conversion circuit
(C) Attenuator circuit
(D) Transducer circuit
11. In digital volt meters, this A/D conversion technique is used
(A) Voltage to time conversion
(B) All these
(C) Successive approximation technique
(D) Voltage to frequency conversion
12. Digital voltmeters may be of this type
(A) Ramp type
(B) All these
(C) Dual slope type
(D) Potentiometric type
13. DVM is an abbreviation of
(A) Dual voltage measurement
(B) Digital vacuum meter
(C) Digital volt meter
(D) Dual slope voltage measurement
14. By adding a suitable transducer unit, a digital volt meter can be converted into this meter
(A) All these
(B) Digital ohm meter
(C) Digital multi-meter
(D) Digital ampere meter
15. Decrease of one digit in the measured voltage (as per its resolution) in a digital volt meter is called
(A) Resolution error
(B) Sample error
(C) Quantization error
(D) Time lag error
16. Digital instruments cannot be
(A) Recalibrated
(B) Repair
(C) None of these
(D) Recheck
17. Ramp type digital voltmeter works on this principle
(A) Voltage to frequency conversion technique
(B) Voltage to time conversion technique
(C) Voltage comparison technique
(D) None of these
18. The technique used in integrating type digital voltmeter
(A) Voltage to time conversion
(B) Voltage comparison
(C) Voltage to frequency conversion
(D) All these
19. Digital ampere meter is basically a
(A) Digital frequency meter
(B) Digital multi-meter
(C) Digital ohm meter
(D) Digital volt meter
20. This is used in a digital ohm meter.
(A) A DVM and a resistance of known value
(B) One transducer circuit and a constant current source
(C) One A/D conversion circuit and a constant current source
(D) None of these
21. For the supply of constant current, this is used in digital ohm meter
(A) Operational amplifier
(B) Feedback resistor
(C) Attenuator
(D) Both a & b
22. Digital multi-meter can be used to measure
(A) A.C current
(B) D.C voltage
(C) Resistance
(D) All these
23. In digital multi-meter, this converter circuit is used.
(A) Resistance to voltage conversion
(B) Current to voltage conversion
(C) All these
(D) A.C to D.C conversion