ANR 2022 -> DECK MANAGERIAL -> 08 MIB (QUESTIONS & ANSWERS)
ANR
a)
1
A transformer in an electric circuit serves to
generate its own electrical power
b)
c)
d)
transform electrical energy into mechanical energy
increase or decrease circuit voltage as required
convert AC c...
Navigare necesse est vivere non est necesse
ANR 2022 -> DECK MANAGERIAL -> 08 MIB (QUESTIONS & ANSWERS)
ANR - 1 A transformer in an electric circuit serves to
a) generate its own electrical power
b) transform electrical energy into mechanical energy
c) increase or decrease circuit voltage as required
d) convert AC current to DC current
Right answer: a) b) c) X d)
ANR - 2 The basic operating principle of a transformer is attributed to
a) electromagnetic induction
b) variance of a conductor in a magnetic field
c) mutual reaction
d) thermionic emission
Right answer: a) X b) c) d)
ANR - 3 Transformer cores are laminated to reduce
a) eddy currents
b) secondary flux
c) leakage flux
d) all of the above
Right answer: a) X b) c) d)
ANR - 4 A certain transformer has a turns ratio of 1:1. The transformer is used for:
a) impedance matching.
b) changing frequency.
c) isolation.
d) stepping-up voltage.
Right answer: a) b) c) X d)
ANR - 5 A step-down transformer is used to change:
, Navigare necesse est vivere non est necesse
ANR 2022 -> DECK MANAGERIAL -> 08 MIB (QUESTIONS & ANSWERS)
ANR - 11 Most transformers operate to transfer energy at an efficiency of about:
a) 25 percent.
b) 75 percent.
c) 80 percent.
d) 95 percent.
Right answer: a) b) c) d) X
ANR - 12 Motors are usually not rated for:
a) power factor
b) duty cycle
c) service factor
d) temperature
Right answer: a) X b) c) d)
ANR - 13 One disadvantage of the autotransformer is:
a) it can only step up the voltage
b) it can only step down the voltage
c) it does not provide electrical isolation
d) none of the above
Right answer: a) b) c) X d)
ANR - 14 Power transformers are designed to operate:
a) from 50-Hz line frequency.
b) in the audio frequency range.
c) in the radio frequency range.
d) all of these
Right answer: a) X b) c) d)
ANR - 15 The currents induced in the core of a transformer are called:
, Navigare necesse est vivere non est necesse
ANR 2022 -> DECK MANAGERIAL -> 08 MIB (QUESTIONS & ANSWERS)
ANR - 16 The direction of rotation of a split-phase induction motor can be changed by:
a) reversing the current through the rotor.
b) reversing the leads of the AC voltage source.
c) reversing the leads to either the starting or the main winding.
d) reversing the leads to both the starting and the main winding.
Right answer: a) b) c) X d)
ANR - 17 The purpose of the capacitor in a capacitor-start motor is to:
a) produce a higher starting torque.
b) block DC from getting to the starter winding.
c) limit field current to the starter winding.
d) increase running speed.
Right answer: a) X b) c) d)
ANR - 18 The rated input and output voltages of a transformer are checked with a
voltmeter. Technician A says a normal primary voltage reading and no secondary
voltage reading is an indication of an open secondary coil. Technician B says it is
normal for the transformer output voltage to be higher than specified if no load is
a) Technician A only
b) Technician B only
c) both Technician A and Technician B
d) neither Technician A nor Technician B
Right answer: a) b) c) X d)
ANR - 19 The rotor current for a split-phase induction motor is obtained:
a) directly from a separate DC source.
b) directly from the applied AC source.
c) from a rotating magnetic field set up in the stator.
d) by the action of the centrifugal switch.
Right answer: a) b) c) X d)
ANR - 20 The transformer used with a certain model car set has 240 turns in its primary
coil and 24 turns in its secondary coil. If the transformer is connected to a 120-V wall
receptacle the secondary voltage output would be approximately:
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