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) All these
(B) Digital ampere meter
(C) Digital multi-meter
(D) Digital voltmeter
3. Advantage of digital instruments as compared to analogue instruments
(A) Digital instruments are free from parallax error
(B) All these
(C) Digital instruments are free from frictional error
(D) There is no problem of zero adjustment in digital instruments
4. A digital volt meter can accurately measure voltage up to
(A) One tenth of a volt
(B) One millionth of a volt
(C) One thousandth of a volt
(D) One hundredth 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) Repair is easy and cheaper
(B) Have simple circuits
(C) These can hold data
(D) Sampling rate is high
7. Function of transducer unit in digital instruments is
(A) To count the pulses of input signal
(B) To improve/increase the input signal
(C) To attenuate the input signal
(D) To change a physical quantity into electrical signal
8. With the help of this unit, digital instruments can also measure non electrical quantities.
(A) Transducer unit
(B) Analogue to digital conversion unit
(C) Counter unit
(D) Attenuator 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) All these
(B) Voltage to frequency conversion
(C) Successive approximation technique
(D) Voltage to time conversion
12. Digital voltmeters may be of this type
(A) Ramp type
(B) Potentiometric type
(C) Dual slope type
(D) All these
13. DVM is an abbreviation of
(A) Dual voltage measurement
(B) Digital volt meter
(C) Digital vacuum 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) Time lag error
(B) Sample error
(C) Quantization error
(D) Resolution error
16. Digital instruments cannot be
(A) Recalibrated
(B) Repair
(C) Recheck
(D) None of these
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) All these
(C) Voltage comparison
(D) Voltage to frequency conversion
19. Digital ampere meter is basically a
(A) Digital multi-meter
(B) Digital volt meter
(C) Digital ohm meter
(D) Digital frequency meter
20. This is used in a digital ohm meter.
(A) One transducer circuit and a constant current source
(B) One A/D conversion circuit and a constant current source
(C) A DVM and a resistance of known value
(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) All these
(C) Resistance
(D) D.C voltage
23. In digital multi-meter, this converter circuit is used.
(A) Resistance to voltage conversion
(B) Current to voltage conversion
(C) A.C to D.C conversion
(D) All these