Model Quiz Measurement and Instrumentation Test2

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1. Which of the following devices should be used for accurate measurement of low D.C. voltage ?
Small range moving coil voltmeter	D.C. potentiometer
Small range thermocouple voltmeter	None of the above

2. It is required to measure the true open circuit e.m.f. of a battery. The best device is _____.
D.C. voltmeter	Ammeter and a known resistance
D.C. potentiometer	None of the above

3. A voltage of about 200 V can be measured _____.
directly by a D.C. potentiometer	a D.C. potentiometer in conjunction with a volt ratio box
a D.C. potentiometer in conjunction with a known resistance	none of the above

4. A direct current can be measured by ______.
a D.C. potentiometer directly	a D.C. potentiometer in conjunction with a standard resistance
a D.C. potentiometer in conjunction with a volt ratio box	none of the above

5. To measure a resistance with the help of a potentiometer it is _____.
necessary to standardise the potentiometer	not necessary to standardise the potentiometer
necessary to use a volt ratio box in conjunction with the potentiometer	none of the above

6. A phase shifting transformer is used in conjunction with _____.
D.C. potentiometer	Drysdale potentiometer
A.C. co-ordinate potentiometer	Crompton potentiometer

7. Basically a potentiometer is a device for _____.
comparing two voltages	measuring a current
comparing two currents	measuring a voltage

8. In order to achieve high accuracy, the slide wire of a potentiometer should be _____.
as long as possible	as short as possible
neither too small not too large	very thick

9. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken _____.
from a source which is not the same as the unknown voltage	from a battery
from the same source as the unknown voltage	any of the above

10. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a ____.
single-phase winding	two-phase winding
three-phase winding	any of the above

11. In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be _______.
out of phase by 90°	out of phase by 60°
out of phase by 30°	out of phase by 0°

12. A universal RLC bridge uses _____.
Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance	Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance
Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance	Any of the above.

13. For measurements on high voltage capacitors, the suitable bridge is _____.
Wein bridge	Modified De Santy's bridge
Schering bridge	Any of the above

14. In an Anderson bridge, the unknown inductance is measured in terms of _____.
known inductance and resistance	known capacitance and resistance
known resistance	known inductance

15. Wagner earthing device is used to eliminate errors due to _____.
electrostatic coupling	electromagnetic coupling
both (a) and (b)	none of the above

16. For measurement of mutual inductance we can use ______.
Anderson bridge	Maxwell's bridge
Heaviside bridge	Any of the above

17. For measurement of inductance having high value, we should use _____.
Maxwell's bridge	Maxwell Wein bridge
Hay's bridge	Any of the above

18. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is _____.
10°	80°
120°	170°

19. In a Schering bridge the potential of the detector above earth potential is _____.
a few volts only	1 kV
5 kV	10 kV

20. To avoid the effect of stray magnetic field in A.C. bridges we can use ______.
magnetic screening	Wagner earthing device
wave filters	any of the above