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SSC JE ELECTRICAL
ssc MCQs with answers - part-14
1. A synchronous motor has better power factor than an induction motor. This is due to ?
-Stator supply is not required to produce magnetic field
-Synchronous motor has no slip
-Mechanical load on the rotor remains constant
-Synchronous motor has large airgap
Answer: Stator supply is not required to produce magnetic field
2. When the field circuit of an unloaded salient pole synchronous motor gets suddenly open circuited, then ?
-the motor stops
-it runs at a slower speed
-it continues to run at the same speed
-it runs at a very high speed
Answer: the motor stops
3. The resultant armature voltage of a synchronous motor is equal to the ?
-vector sum of Eb and V
-vector difference of Eb and V
-arithmetic sum of Eb and V
-arithmetic difference of Eb and V
Answer: vector difference of Eb and V
4. The armature current of a synchronous motor is minimum when operating at ?
-unity power factor
-0.707 power factor lagging
-0.707 power factor leading
-zero power factor leading
Answer: unity power factor
5. Why are same types of cells connected in parallel ?
-To decrease the voltage rating
-To increase the voltage rating
-To decrease the current rating
-To increase the current rating
Answer: To increase the voltage rating
6. There are N resistances, each are connected in parallel having value R with equivalent resistance of X. What will be the total resistance when these N resistances are connected in series ?
-NX
-RNX
-X/N
-N²X
Answer: N²X
7. Which of the following is equivalent to 0.5 kWh ?
-1800000 W
-1800000 J
-18000000 J
-36000000 J
Answer: 1800000 J
8. What is the conductivity (in Mhos/m) of a 2 Ohm circular wire, when the length and the diameter of the wire are 10 m and 0.8 m respectively ?
-10
-1
-0.1
-5
Answer: 10
9. Erg is a unit of measurement for ?
-Energy
-Power
-Voltage
-Impedance
Answer: Energy
10. Which of the following quantity will remain the same, when a layer of Teflon is inserted between the plates of a charged parallel plate capacitor ?
-Capacitance
-Charge
-Energy of the capacitor
-Potential
Answer: Charge
