Electrical Installation Maintenance and Testing 6

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Electrical Engineering MCQ Question Papers: Campus Placement

Subject: Electrical Installation Maintenance and Testing 6

Part 6: List for questions and answers of Electrical installation Maintenance and Testing


Q1.What does ‘increasing In R with time indicates?

a) Healthy insulation

b) Poor insulation

c) Moderate insulation

d) None of these


Q2.What is dielectric absorption ratio?

a) (InR 30 s) / (InR 60 s)

b) (InR 60 s) / (InR 30 s)

c) (InR 10 s) / (InR 60 s)

d) (InR 60 s) / (InR 10 s)


Q3.Which among these tests is a DC test?

a) Polarisation index

b) Lightning impulse

c) Induced voltage tests

d) Switching voltage impulse


Q4.Which among these is the cause of sparking at brushes in DC motor?

a) Defective brushes

b) Defect in Commutator

c) Excessive load

d) All of these


Q5.Which material is used for the manufacture of brushes in DC motors?

a) Graphite

b) Lead

c) Copper

d) All of these


Q6.Which among these DC motor(s) is / are having lower full load torque?

a) Series motor

b) Shunt motor

c) Cumulative motor

d) Differential motor 


Q7.Which method is used for obtaining starting torque in a single phase induction motor?

a) Resistance split phase starting

b) Capacitor start capacitor run

c) Permanent split capacitor motor

d) All of these


Q8.Which type of rotor is used for single phase induction motor?

a) Wound rotor

b) Squirrel cage rotor

c) Both (A) and (B)

d) None of these


Q9.What is the main causes for the noise in the machine?

a) Magnetostriction

b) Aerodynamics

c) Bearing noise of rotating shaft

d) All of these


Q10.Which method is used to measure the speed of a synchronous machine?

a) Stroboscopic method

b) By tachometer

c) By measuring the frequency by means of frequency meter

d) All of these


Q11.What test is conducted on the synchronous motor before completely assembling the whole machine?

a) Speed torque curves

b) Bearing insulation

c) Dielectric tests on the armature windings

d) Measurement of DC resistance of armature winding


Q12.What results if the rotor bar of a squirrel cage rotor is broken?

a) Noise

b) Low starting torque

c) Rated speed is not reached even with rated voltage and frequency

d) All of these 


Q13.What is the application of ‘inverse torque power output type’ squirrel cage motor?

a) Conveyors

b) Fans

c) Centrifugal pumps

d) Machine tools


Q14.What is the usual voltage range in the slip rings for the induction motor?

a) 50 V to 115 V

b) 100 V to 1 kV

c) Is proportional to the stator voltages

d) None of these


Q15.What is the usual rating of a synchronous induction motor?

a) Below 25 kW

b) Below 5 kW

c) Above 30 kW

d) Above 100 kW


Q16.Which system present in the synchronous motor makes it costlier than Induction motor of the same size?

a) Damper windings

b) Additional excitation system

c) Additional field windings

d) None of these


Q17.What is filled in between fixed and rotating parts of a cryogenic generator?

a) Dry air

b) Hydrogen

c) Oxygen

d) None of these


Q18.Which power factor condition is not suitable for the operation of synchronous generator?

a) Leading power factor

b) Lagging power factor

c) Both (A) and (B)

d) None of these 


Q19.Why are the high voltage test conducted on the rotating machine?

a) To check the winding resistance

b) To check the insulation of windings

c) To check the maximum power rating of the machine

d) All of these


Q20.What will be the rating of heater if the machine to be dried is less than 500 kW?

a) 1.5 – 3 % of the machine rating

b) 3.5 % of the machine rating

c) 5 % of the machine rating

d) 5.5 % of the machine rating 


Part 6: List for questions and answers of Electrical installation Maintenance and Testing


Q1. Answer: a


Q2. Answer: b


Q3. Answer: a


Q4. Answer: d


Q5. Answer: a


Q6. Answer: b


Q7. Answer: d


Q8. Answer: b


Q9. Answer: d


Q10. Answer: d


Q11. Answer: b


Q12. Answer: d


Q13. Answer: d


Q14. Answer: b


Q15. Answer: A


Q16. Answer: B


Q17. Answer: B


Q18. Answer: A


Q19. Answer: B


Q20. Answer: B