Engineering
Engineering MCQs With Answers
0 Engineering MCQs for CSS, PPSC, FPSC, NTS and entry-test preparation. Take a scored quiz instead →
Proximity effect in a transmission line conductor results in:
ADecrease in effective line resistance
BComplete cancellation of line inductance
CNon-uniform current distribution due to magnetic flux from neighboring conductors
DUniform current distribution across cross-section
Which type of fault in a 3-phase power transmission line is the most frequent?
ADouble Line-to-Ground (L-L-G) fault
BSingle Line-to-Ground (L-G) fault
CLine-to-Line (L-L) fault
DSymmetrical Three-Phase fault (L-L-L)
The surge impedance of an underground cable is significantly lower than overhead lines, usually around:
A40 to 50 ohms
B5 to 10 ohms
C1000 ohms
D400 to 500 ohms
An over-excited synchronous motor operating on no-load acts as a:
ASynchronous condenser
BInductive load
CResistive heater
DStep-down transformer
The surge impedance of a typical overhead transmission line is approximately in the range of:
A400 to 500 ohms
B10 to 20 ohms
C1000 to 2000 ohms
D40 to 50 ohms
V-curves of a synchronous motor illustrate the relationship between:
APower factor and field current
BTerminal voltage and load current
CArmature current and field current
DTorque and speed
Inverted V-curves of a synchronous motor represent the plot between:
ASupply voltage and frequency
BArmature current and field current
CArmature current and power factor
DPower factor and field current
Swinburne’s test is a convenient indirect method used to determine no-load losses and efficiency of:
A1-phase Transformers
BDC shunt and compound machines
C3-phase Alternators
DDC series motors only
In a 3-phase synchronous motor, damper windings (pole face windings) are provided to:
AIncrease field excitation
BEliminate eddy currents
CReduce armature reaction
DPrevent hunting and provide starting torque
The speed-torque characteristic of a DC series motor closely resembles a:
AParabola opening upwards
BHorizontal straight line
CStraight line through origin
DRectangular hyperbola