MENSURATION & INSTRUMENTATION MCQS SET 06

MENSURATION & INSTRUMENTATION MCQS SET 06

1)   The meter of a vibrating reed frequency meter depends for its indications on the
a. Electrical resonance of thin flat steel reeds
b. Mechanical resonance of thin flat steel reeds
c. Mechanical resonance of thick flat steel reeds
d. Electrical resonance of thick flat steel reeds
ANSWER: Mechanical resonance of thin flat steel reeds
 

2)   Vibration galvanometer are generally used
a. For measuring electric charges
b. As null - point detectors in ac bridges
c. As null - point detectors in dc bridges
d. For measuring power
ANSWER: As null - point detectors in ac bridges
 

3)   Ballistic galvanometer are principally used for the measurement of
a. Current
b. Voltage
c. Power
d. Electric charges
ANSWER: Electric charges
 

4)   The two wattmeters used for the measurement of power input read 50 kW each. What will be the readings of the two wattmeters if the power factor is changed to 0.8 leading keeping the total input power same?
a. 28.35W, 71.65W
b. 31.25W, 73.71W
c. 33.33W, 73.33W
d. 38.35W, 75.5W
ANSWER: 28.35W, 71.65W
 

5)   If a capacitor is connected across a portion of resistance of multiplier of the wattmeter then the pressure coil of the circuit becomes
a. Inductive
b. Non inductive
c. Capacitive
d. Non capacitive
ANSWER: Non inductive
 

6)   For the measurement of unknown inductance in terms of known capacitance, the suitable ac bridges are
a. Maxwell and Schering bridge
b. Maxwell and Wien’s bridge
c. Maxwell and Hay’s bridge
d. Hay’s and Wien’s bridge
ANSWER: Maxwell and Hay’s bridge
 

7)   The Wien’s bridges is suitable for the measurement of frequency of the range of
a. Less than 100 Hz
b. 100 Hz to 100 kHz
c. 1 kHz to 100 MHz
d. More than 100 MHz
ANSWER: 100 Hz to 100 kHz
 

8)   In a slide wire potentiometer, for a voltage source of 1.012 V the jockey is kept at 101.2 cm. If the potentiometer has 20 wires of 1 m each and the resistance of wires is 800 ohm, then the value of the working current is
a. 15 mA
b. 20 mA
c. 25 mA
d. 27 mA
ANSWER: 25 mA
 

9)   For the measurement of low resistances from few ohms down to one micro ohm, which of the following instrument is not suitable?
a. Potentiometer method
b. Ammeter – voltmeter method
c. Ohmmeter
d. Kelvin double bridge method
ANSWER: Ohmmeter
 

10)   For the measurement of low resistances, Kelvin’s double bridge has high accuracy because
a. It has two set of ratio arms which eliminates effect of resistance of connecting lead
b. It has a null indicating galvanometer
c. It has two null indicator
d. It has four sets of ratio arms which eliminates the effect of resistance of connecting lead
ANSWER: It has two set of ratio arms which eliminates effect of resistance of connecting lead