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MCQs 1: Which type of insulation is preferred if the maximum temperature is 130°?

Class A Class B Class E Class F
Answer Explanation

MCQs 2: Which test is a special type of test performed on the transformers?

Partial discharge Temperature rise test Ratio and polarity test Noise level test
Answer Explanation

MCQs 3: Which among these is not a type test performed on the current transformers?

Overvoltage inter turn tests Short time current tests Temperature rise tests Error measurement
Answer Explanation

MCQs 4: Which among these is the essential part for a CT?

Insulation over the core by tape Support porcelain or epoxy insulator Synthetic resin or oil insulation All of these None of these
Answer Explanation

MCQs 5: What are the types of voltage transformers?

Electromagnetic potential transformers Capacitor potential transformers Inductor and resistor potential transformers Only (a) and (b) All of these
Answer Explanation

MCQs 6: What will be the relay current range in amperes for a 3 phase 50 Hz 12.5 Hp 440 V motor?

13 – 20 A 20 – 30 A 30 – 45 A 6 – 13 A
Answer Explanation

MCQs 7: Which among these is / are the abnormal operating conditions caused due to mechanical overloads?

Sustained overloads Prolonged starting or locked rotor Stalling Only (a) and (b) All of these
Answer Explanation

MCQs 8: What protection is preferred for preventing rotor faults?

Thermal relay HRC fuses Instantaneous over current relay Differential protection
Answer Explanation

MCQs 9: Which among the following cooling system is employed for large machine?

Radial flow Axial flow Combined radial and axial cooling Multiple inlet cooling
Answer Explanation

MCQs 10: What does S in ‘IP 11S’ represent?

Machine was tested when it was in running. Machine was tested when not running condition. Machine was tested at light load. None of these.
Answer Explanation

MCQs 11: Which cooling technique is employed for large turbo alternators?

Forced air cooling Hydrogen cooling Direct water cooling Only (b) & (c) All of these
Answer Explanation

MCQs 12: What is the value of R and C in RC surge suppressor?

R = 1000 Ω C = 0.01 μ F R = 100 Ω C = 0.1 μ F R = 1000 Ω C = 0.1 μ F R = 100 Ω C = 0.01 μ F
Answer Explanation

MCQs 13: Which among the following factors affect the cost of motor? i. Reliability and Availability ii. Installation & Commissioning charges iii. Running cost, KVAr iv. Depression formula used

i & ii ii, iii, iv i, ii, iv i, ii, iii & iv
Answer Explanation

MCQs 14: Which motor is preferred for cement industry?

Squirrel cage motor Synchronous motor Universal motor DC series motor
Answer Explanation

MCQs 15: What is the thickness of shims used to raise the motor?

0.5 mm – 5 mm 0.2 mm – 2 mm 0.1 mm – 1 mm None of these
Answer Explanation

MCQs 16: Which among these is a procedure used for the alignment of shaft?

Axial positioning of the shaft Paralleling of the shaft axis Centring of shaft axis Only (a) and (c) All of these
Answer Explanation

MCQs 17: What is the permissible value of temperature of the machine parts while drying out by resistance method?

65 °C 70 °C 80 °C 45 °C
Answer Explanation

MCQs 18: Which among these are the properties of good grease? i. Corrosion protection ii. Viscosity iii. Consistencies iv. Mechanical stability

i & ii only i & iii only iii & iv only i, ii, iii & iv
Answer Explanation

MCQs 19: What will be the re - lubrication period for ordinary grease for a 1000 rpm motor if it runs for 24 hours a day?

10 weeks 5 weeks 2 weeks 1 week
Answer Explanation

MCQs 20: Which among these tests are pre start test on an electrical machine? i. Measurement of winding resistance ii. On load tests iii. Vibration tests iv. High voltage tests v. Tests on cooling system

i & iv only i, ii & iv only i, ii, iv & v only i, ii, iii, iv, v only
Answer Explanation

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