Related Post

MCQ of D.C motor page-1MCQ of D.C motor page-2MCQ of D.C motor page-3MCQ of D.C motor page-4Multiple Choice Question (MCQ) of D.C. Machines page-1Multiple Choice Question (MCQ) of D.C. Machines page-2Multiple Choice Question (MCQ) of D.C. Machines page-3Multiple Choice Question (MCQ) of D.C. Machines page-4Multiple Choice Question (MCQ) of D.C. Machines page-5Multiple Choice Question (MCQ) of D.C. Machines page-6Multiple Choice Question (MCQ) of D.C. Machines page-7Multiple Choice Question (MCQ) of D.C. Machines page-8Multiple Choice Question (MCQ) of D.C. Machines page-9Multiple Choice Question (MCQ) of D.C. Machines page-10MCQ of D.C motor page-5MCQ of D.C motor page-6MCQ of D.C motor page-7MCQ of D.C motor page-8MCQ of D.C motor page-9MCQ of D.C motor page-10MCQ of D.C motor page-11MCQ of D.C motor page-12MCQ of D.C motor page-13MCQ of D.C motor page-14MCQ of D.C motor page-15MCQ of D.C motor page-16MCQ of D.C motor page-17MCQ of D.C motor page-18

Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generatorsMCQ-Control-SystemMCQ-Measurementsmcq-of-Generation-power-systemMCQ-of-Induction-MotorMCQ-of-Transmission-DistributionMCQ-of-Electrical-MachinesMCQ-of-Alternator-and-Synchronous-MotorsMCQ-Electric-Power

Multiple Choice Question (MCQ) of D.C. Machines page-1


≪ Previous Next ≫

1.A shunt motor is fitted with a field regulator for speed control. For constant torque load, the speed will be minimum when the resistance of the regulator is

a) 0Ω
b) Infinite
c) About 10Ω
d) About 100Ω

Ans: (a)

2. Carbon brushes are used in electric motors to

a) Prevent sparking during commutation
b) Provide a path for flow of current
c) Brush off carbon deposits on the commutator
d) None 0f these

Ans: (b)

3. The resistance of the field regulator of a dc shunt motor is of order of

a) 0.1Ω
b) 1Ω
c) 10Ω
d) 100Ω

Ans: (d)

4. Interpoles in dc motors are used for

a) Increasing the speed of motor
b) Reducing sparking at the commutation
c) Decreasing the counter emf
d) Converting armature current to dc

Ans: (b)

5. The dc compound motors are generally

a) Cumulative compound
b) Differential compound
c) Level compound
d) None of these

Ans: (a)

6. Small dc motors upto 5 HP usually have

a) 2 poles
b) 4 poles
c) 6 poles
d) 8 poles

Ans: (a)

7. The air gap between stator and armature of an electric motor is kept as small as possible

a) To get a stronger magnetic field
b) To improve the air circulation
c) To reach a higher speed of rotation
d) To make the rotation easier

Ans: (a)

8. The resistance of the starter of a 220 v, 5 HP dc shunt motor is of the order of

a) 0.01Ω
b) 0.1Ω
c) 1Ω
d) 10Ω

Ans: (d)

9. In a dc motor, unidirectional torque is produced with the help of

a) Brushes
b) Commutator
c) End plates
d) Both (a) and (b)

Ans: (d)

10. A dc motor can be easily identified by

a) Yoke
b) Size of conductor
c) Commutator
d) Winding

Ans: (c)


≪ Previous Next ≫


Related topics :


Recent Post

Multiple Choice Question (MCQ) of Transmission and Distribution page-3:
21. ACSR conductor implies
A) Anodized Core Smooth Run
B) Anode current sinusoidally run
C) Aluminium conductor steel reinforced
D) All conductors surface treated and realigned.

Read more...

Multiple Choice Question (MCQ) of Transmission and Distribution page-2:
11. In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than
A) 80 km
B) 100 km
C) 160 km
D) 200 km.

Read more...

Multiple Choice Question (MCQ) of Transmission and Distribution page-1:
1. Which of the following is not the transmission voltage in India ?
A) 400 kV
B) 264 kV
C) 132 kV
D) 66 kV.

Read more...