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1687.

Data buffering means
a. A buffer stock of data already stored in a computer unit
b. An electronic circuit which is used to maintain the level of data
c. That data are first collected in an external, unit and then processed into the computer
d. Application of buffer (unity gain amplifier) at input interface to the computer

asked in Electrical Paper-1, 1997

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1688.

Match List-I with List-Il. and select the correct answer:

List I
A. Low pass filter
B. High pass filter
C. Band pass filter
D. Band reject filter List II

a. A→1, B→4, C→3, D→2
b. A→4, B→1, C→2, D→3
c. A→1, B→4, C→2, D→3
d. A→4, B→1, C→3, D→2

asked in Electrical Paper-1, 1997

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1689.

A 7- bit successive approximation DVM will convert the analog input into digital output in a period of
a. 7 clock pulses
b. 8 clock pulses
c. [( input signal amplitude(/(full-scale output amplitude)] × 7 clock pulses
d. [( input signal amplitude(/(full-scale output amplitude)] × 8 clock pulses

asked in Electrical Paper-1, 1997

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1690.

For a thermocouple pair (A,B), the extension wires (C,P)
a. Should be identical pair elements
b. Should ‘have identical temperature - emf relationship
c. Can be of any two dissimilar materials
d. Should have very small temperature - emf sensitivity

asked in Electrical Paper-1, 1997

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1691.

A piezoelectric transducer has the following parameter values:
Crystal capacitance = 10^-9 F
Cable capacitance = 2×10^-10 F
Charge sensitivity = 4×10^-6 Coulomb/cm.
If the oscilloscope used for read-out has an input resistance of 1 MΩ in parallel with C = 4 × 10^-10 F, then the voltage sensitivity constant will be
a. 2500 V/cm
b. 3334 V/cm
c. 4000 V/cm
d. 4500 V/cm

asked in Electrical Paper-1, 1997

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1692.

Consider the following statements:
The causes of error in the measurement of temperature using a thermistor are
1. Self heating
2. Poor sensitivity.
3. Non-linear characteristics.
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

asked in Electrical Paper-1, 1997

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