# Multiple Choice Question (MCQ) of Measurements page-12

111.The pointer deflection of wattmeter is proportional to

a) Torque produced in the wattmeter b) Voltage
c) Current
d) Power
e) (a) or (b)

Ans: (e)

112. Induction wattmeters can be used to measure

a) AC power
b) DC power
c) AC or DC power
d) AC power of single phase only

Ans: (a)

113. Motor meters can be used to measure AC or DC

a) Watt-hours
b) Ampere-hours c) Current
d) Voltage
e) (a) or (b)

Ans: (c)

114. Motor meter can be used to measure

a) AC energy
b) DC energy
c) AC or DC energy
d) None of the above

Ans: (d)

115. The one “unit” of energy measured in AC circuit is equivalent to

a) One watt-hour
b) One kilowatt-hour
c) One watt
d) One kilowatt
e) One joule

Ans: (b)

116. Which of the following energy meter is universally accepted to measure AC encrgy?

a) Motor meter
b) Induction type meter
c) Mercury motor meter
d) Reason Electrostatic meter

Ans: (b)

117. Which of the following loads are dangerous for thermal heating of wattmeter even if meter reading is low?

a) Loads with high value of power factor
b) Loads with low value of power factor
c) Chokes
d) (b) and (c)

Ans: (d)

118. The eddy current torque on a metallic disc rotating between poles of permanent magnet in energy meter is directly proportional to the angular velocity of the disc.

a) True
b) False

Ans: (a)

119. If the reading of two wattmeters in two-wattmeter method of power measurement are 4 kW and 3 kW respectively and the latter reading being obtained after reversing connection of the current coil of wattmeter, what will be the power?

a) 6 kW
b) 1 kW
c) 4 kW
d) 5 kW
e) 7 kW

Ans: (b)

120.An AC potentiometer can be used to measure the loss in an iron ring made up of thin stampings.

a) True
b) False

Ans: (a)