MENSURATION & INSTRUMENTATION MCQS SET 02

MENSURATION & INSTRUMENTATION MCQS SET 02

1)   Moving iron power factor meter are suitable for 3 phase balanced circuits. It consists of
a. One control spring
b. Two control spring
c. Three control spring
d. No control spring
ANSWER: No control spring
 

2)   If the frequency of electrodynamic power factor meter is doubled then its reading will become
a. Twice of the original reading
b. Half of the original reading
c. Four times of the original reading
d. Remains unaffected
ANSWER: Remains unaffected
 

3)   A moving iron frequency meter consists of
a. Two inductive circuits connected in parallel
b. One inductive and one non inductive circuit connected in parallel
c. Two non inductive circuits connected in parallel
d. One inductive and one non inductive circuit connected in series
ANSWER: One inductive and one non inductive circuit connected in parallel
 

4)   The electrodynamic frequency meters have
a. Linear scale and their readings does not depends on voltage
b. Linear scale and their readings depends on voltage
c. Non linear scale and their readings does not depends on voltage
d. Non linear scale and their readings depends on voltage
ANSWER: Linear scale and their readings does not depends on voltage
 

5)   The earth resistance can be measured by
a. Fall of potential method
b. Using an earth tester
c. Ducter ohmmeter method
d. Only (a) and (b)
e. All the above
ANSWER: Only (a) and (b)
 

6)   Electrical equipments are generally earthed through an electrode to avoid shocks when someone touches the body of the equipment. The earth resistance is effected by
a. Depth of electrodes buried in the soil
b. Shape and material of earth electrodes
c. Specific resistance of the soil surrounding the electrode
d. All of these
e. None of these
ANSWER: All of these
 

7)   When a voltmeter - ammeter method is applied for the measurement of resistance, the voltmeter reads a value of 8.28 V and the ammeter reading is 4.14 mA. Then the value of the resistance will be
a. 2 kO
b. 2.0 kO
c. 2.00 kO
d. 2.000 kO
ANSWER: 2.00 kO
 

8)   At 2 MHz, the resonance is obtained with a resonating capacitance value of 12 pF and at 400 kHz, the resonance is obtained with resonating capacitance value of 320 pF. Then the self capacitance of the coil is
a. 0.62 pF
b. 0.83 pF
c. 1.2 pF
d. 1.5 pF
ANSWER: 0.62 pF
 

9)   In AC bridges, the Wagner earth devices are used to
a. Remove all the earth capacitances from the bridge circuit
b. Remove harmonics
c. Reduce error caused by stray electric field
d. All of these
ANSWER: All of these
 

10)   Shielding of the capacitor is done to
a. Make the value of capacitor definite
b. Balance the bridge without any problem
c. Both (a) and (b)
d. None of these
ANSWER: Both (a) and (b)