Maintenance & Testing of Electrical Equipment Test Question - Set 11

1)   Which among these tests are included in high voltage tests?

a. Power wet test
b. Impulse voltage withstand tests
c. Power frequency withstand test 1 minute dry
d. Only a and b
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


2)   What parameter(s) is / are checked using the commissioning tests?

a. Turbine speed
b. Condenser vacuum
c. Turbine governor valve opening
d. Only b and c
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


3)   At what angle difference is the main winding and the start winding separated in a spilt phase capacitor start induction motor?

a. 45° electrical
b. 90° electrical
c. 45° mechanical
d. 90° mechanical
Answer  Explanation 

ANSWER: 90° electrical

Explanation:
No explanation is available for this question!


4)   What is the use of current transformers?

a. Stepping up AC current
b. Measuring and protection
c. Stepping down AC current
d. Both (b) and (c)
e. All of these
Answer  Explanation 

ANSWER: Both (b) and (c)

Explanation:
No explanation is available for this question!


5)   What is the typical value of the capacitor used in ‘capacitor start capacitor run’ induction motor?

a. 5 μ F
b. 40 μ F
c. 300 μ F
d. 1000 μ F
Answer  Explanation 

ANSWER: 300 μ F

Explanation:
No explanation is available for this question!


6)   Which among these is the application of universal motors?

a. Vacuum cleaners
b. Fans
c. Hair dryers
d. Washing machines
Answer  Explanation 

ANSWER: Vacuum cleaners

Explanation:
No explanation is available for this question!


7)   Which type of enclosure is provided for DC motors used in coal handling plants?

a. Screen protected
b. Open type
c. Totally enclosed fan cooled
d. Drip proof
Answer  Explanation 

ANSWER: Totally enclosed fan cooled

Explanation:
No explanation is available for this question!


8)   Which among the following applications uses ward Leonard method of speed control?

a. Rolling mills
b. Colliery winding motor
c. Lifts and elevators
d. Only a and c
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


9)   What is meant by equaliser bus?

a. The bus connecting series fields in parallel
b. The bus connecting series fields in series
c. The bus connecting shunt fields in parallel
d. The bus connecting shunt fields in series
Answer  Explanation 

ANSWER: The bus connecting series fields in parallel

Explanation:
No explanation is available for this question!


10)   What is the purity of electrically graded aluminium?

a. 95 %
b. 98.3 %
c. 99.5 %
d. 97.5 %
Answer  Explanation 

ANSWER: 99.5 %

Explanation:
No explanation is available for this question!


11)   Which alloy is used as electrical resistance alloy?

a. Nickel alloys
b. Nickel chromium alloys
c. Ferro nickel alloys
d. Only a and b
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!


12)   Which material can be used upto a temperature of 130° C?

a. Mica
b. Cotton
c. Synthetic resin
d. All of these
Answer  Explanation 

ANSWER: Mica

Explanation:
No explanation is available for this question!