Engineering
Engineering MCQs With Answers
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Why should a DC series motor NEVER be started under no-load conditions?
AIt will attain dangerously high speed
BIt will fail to start
CIt will reverse its direction of rotation
DIt will burn out due to low current
The phenomenon of ‘crawling’ in a 3-phase induction motor is primarily caused by:
AUnbalanced supply voltage
B3rd time harmonics
C5th space harmonics in the air-gap field
D7th space harmonics in the air-gap field
The phenomenon of ‘cogging’ in an induction motor refers to:
AVibrations in shaft bearings
BHigh starting current
CMagnetic locking between stator and rotor teeth
DMotor running at 1/7th speed
Schering bridge is primarily employed for the measurement of:
AMutual inductance
BFrequency
CCapacitance and dielectric dissipation factor
DLow resistance
The slip of a 3-phase induction motor at the moment of starting is equal to:
A0.05
B0.0
CInfinity
D1.0
Which AC bridge is specifically suited for measuring inductance with a high Quality factor (Q > 10)?
AMaxwell's Bridge
BWien Bridge
CHay's Bridge
DSchering Bridge
Maxwell-Wien bridge is best suited for measuring unknown inductance of coils having a Q factor in the range of:
A1 < Q < 10
BQ < 1
CQ > 10
DQ > 100
Which measuring instrument operates strictly on the principle of Seebeck effect?
AThermistor
BLVDT
CRTD (Resistance Temperature Detector)
DThermocouple
A Piezoelectric transducer is used to measure dynamic pressure because it converts:
ATemperature change into resistance change
BLight intensity into current
CMechanical strain into electrical charge
DMagnetic flux into voltage
The open-circuit test on a transformer is performed at rated voltage to primarily determine:
AFull-load copper loss
BStray load loss
CCore loss (Iron loss)
DWinding resistance