MENSURATION & INSTRUMENTATION MCQS SET 10

MENSURATION & INSTRUMENTATION MCQS SET 10

1)   Primary current in a current transformer is determined by
a. The load on the system
b. The load on its own secondary
c. The load on its own primary
d. All of these
ANSWER: The load on the system
 

2)   The transformer ratio of the transformer depends upon the
a. Exciting current
b. Secondary current
c. Power factor of secondary circuit
d. All of these
ANSWER: All of these
 

3)   During load test on 3 phase induction motor, the readings of the two wattmeters are -5.5 kW and +12.5 kW respectively. If the line voltage is 420 V then the line current will be
a. 38.91 A
b. 41.02 A
c. 42.10 A
d. 43.94 A
ANSWER: 43.94 A
 

4)   If the reading of the two wattmeters is equal and opposite while measuring power in a 3 phase induction motor then the power factor of the load will be
a. Unity
b. Zero
c. 0.5 lagging
d. 0.5 leading
ANSWER: Zero
 

5)   The full scale current of a galvanometer with internal resistance of 800 ohm is 8 A. what will be the multiplying power of 80 ohm shunt with this galvanometer?
a. 8
b. 9
c. 10
d. 11
ANSWER: 11
 

6)   In L - C connected wattmeter, compensated coil is used. The error in the wattmeter is due to power consumed by the
a. Current coil
b. Potential coil
c. Inductor
d. Capacitor
ANSWER: Potential coil
 

7)   The AC Bridge which is used for the measurement of frequency is
a. Schering bridge
b. Wien bridge
c. Hay’s bridge
d. Anderson bridge
ANSWER: Wien bridge
 

8)   Schering bridges are used for the measurement of
a. Unknown capacitance
b. Dielectric loss
c. Power factor
d. All of these
e. None of these
ANSWER: All of these
 

9)   The bridge suitable for the measurement of capacitance is / are
a. Anderson’s bridge
b. Hay’s bridge
c. Owen’s bridge
d. None of these
ANSWER: None of these
 

10)   The method / methods suitable for the measurement of low resistance is / are
a. Ammeter - voltmeter method
b. Kelvin’s double bridge method
c. Potentiometer method
d. All of these
ANSWER: All of these