Testing and Commissioning of Electrical Equipments (2180901) MCQs

MCQs of Testing of Transformer, Plant and Equipment

Showing 21 to 30 out of 66 Questions
1 2 3 4 5 6
21.
Which of the following is not a winding resistance measurement method?
(a) Current - Voltage
(b) Kelvin bridge
(c) Wheatstone bridge
(d) Maxwell bridge
Answer:

Option (d)

22.
To find per phase resistance in the transformer. ______ and _______ multiply with measured resistance in star and delta connection respectively.
(a) 0.5 & 1.5
(b) 1 & 1.5
(c) 0.5 & 1
(d) 1.5 & 0.5
Answer:

Option (a)

23.
Which of the following measurement is required along with winding resistance measurement?
(a) temprature
(b) insulation resistance
(c) HV test
(d) Turns ration
Answer:

Option (a)

24.
Before winding resistance measurement the transformer shall be at rest in a constant ambient temperature for at least _________ .
(a) 1 hour
(b) 2 hour
(c) 3 hour
(d) 1.5 hour
Answer:

Option (c)

25.
__________ is the test measures the total resistance between any two points separated by a medium for resisting the flow of electrical current.
(a) Insulation Resistance Test
(b) Winding Resistance Test
(c) PI Test
(d) Dielectric Test
Answer:

Option (a)

26.
What equipment is necessary for conducting insulation resistance tests?
(a) Megohmmeter
(b) Temperature indicator
(c) Humidity meter (not necessary if equipment temperature is above the dew point)
(d) All of these
Answer:

Option (d)

27.
The insulation resistance measurements are made for
(a) IR between the transformer's windings & earth
(b) IR between the transformer's windings
(c) IR reference for future measurements
(d) All of these
Answer:

Option (d)

28.
The insulation resistance of the transformer is measured with a _________ ranged between ________________ volt.
(a) DC Voltage, 1000 - 5000
(b) AC Voltage, 1000 - 5000
(c) DC Voltage, 5000 - 10000
(d) AC Voltage, 5000 - 10000
Answer:

Option (a)

29.
When do we need to multiply the correction factor with measured IR value in the transformer?
(a) IR measurement is done other than reference temprature.
(b) IR measurement done during running condition
(c) IR measurement done in moisture condition
(d) IR measurement is done without guard terminal
Answer:

Option (a)

30.
What is the difference between IR and PI test?
(a) both measured using a different measuring instrument
(b) both measure different quantity
(c) both measure Insulation resistance but PI measure along with time
(d) None of these
Answer:

Option (c)

Showing 21 to 30 out of 66 Questions
1 2 3 4 5 6