NEW
Font size
S
M
L
XL
WorksheetsPost Quiz - Day 2 - Controlgear, Motor & PFC
Total questions: 25
Worksheet time: 19mins
Name
Class
Date
1.
What is the range of 4P Contactors available with BCH?
a)
10A to 300A AC1
b)
20A to 500A AC1
c)
20A to 400A AC3
d)
40A to 400A AC1
2.
AC3 duty is a
a)
Utilization category
b)
Temp. Category
c)
Power Category
d)
Voltage Category
3.
While selecting a contactor which the following parameters to be considered?
a)
Type of load
b)
Current rating
c)
Ambient Temp.
d)
All of them
4.
Why EOCR is a better solution for motor protection compared to thermal overload relays?
a)
Provides various protections
b)
High accuracy
c)
Selectable trip time
d)
All of them
5.
If the trip class of a thermal overload relay is 10A then what will be its tripping time in seconds at 7.2 times of set current?
a)
4 to 10 sec
b)
6 to 20 sec
c)
2 to 10 sec
d)
2 to 20 sec
6.
For which Ampere rating external CT is to be used in EOCR
a)
15A
b)
30A
c)
60A
d)
200A
7.
Why Shaded Ring is used in AC Contactor Magnet Core
a)
To avoid Chattering
b)
To increase Coil Flux
c)
To reduce Coil Consumption
d)
To reduce eddy Current
8.
BCH Offer AC/DC Electronic Coil in which range of Contactor
a)
9A to 12A
b)
110A to 175A
c)
40A - 73A
d)
700A to 1200A
9.
What are main USPs of Freedom Series Contactor
a)
Operating Temp -20ºC to 60ºC
b)
Front Access of Contacts
c)
Availablilty of Spare Kits instead of Housing
d)
All of these
10.
If power factor is less than unity then it will result in
a)
Large kVA rating of equipment
b)
Greater conductor size
c)
Electricity penality
d)
All of these
11.
Induction motors operate with _____ power factor
a)
Lagging
b)
Leading
c)
Unity
12.
What is Power Factor?
a)
Cosine Angle Between Voltage & Current
b)
Ration of Active and Apparent Power
c)
Both 1 and 2
d)
None of these
13.
Apparent power is represented by?
a)
KVA
b)
KW
c)
KVAR
d)
Cos ɸ
14.
Which formula used for calculating the required KVAr
a)
kVAr = kW (Sin φ1 – tan φ2)
b)
kVAr = kW (cos φ1 – cos φ2)
c)
kVAr = kW (sin φ1 – cos φ2)
d)
kVAr = kW (tan φ1 – tan φ2)
15.
What is the KVAr range of our Capacitor at 440V
a)
1 to 15 kVAr
b)
1 to 20 kVAr
c)
1 to 25 kVAr
d)
1 to 50 kVAr
16.
Range of BCH Detuned Reactor
a)
1 to 50 kVAr
b)
5 to 100 kVAr
c)
1 to 50 kVAr
d)
5 to 25 kVAr
17.
With Capacitor, we are only improving which type of Power factor ?
a)
Displacement Power Factor
b)
Distortion Power Factor
c)
True Power Factor
d)
None of these
18.
Is our Capacitors ISI marked ?
a)
Yes
b)
No
19.
APP Capacitor comes only in
a)
Box type only
b)
Cylindrical Type only
c)
Box and Cylindrical Both
d)
None of these
20.
We offer APFC Relay in
a)
1 CT only
b)
3 CT Only
c)
1 CT and 3 CT Both
d)
None of these
21.
Which core material is used in BCH motors?
a)
CRNGO
b)
CRNCO
c)
CRGCO
d)
CRCA
22.
At which ambient temperature do the BCH motors function?
a)
40 deg C
b)
50 deg C
c)
60 deg C
d)
70 de C
23.
For BCH motors, winding temperature rise limit over 50C ambient temperature as per:
a)
Class E limit
b)
Class B limit
c)
Class F limit
d)
Class B limit
24.
What is the permissible operating temperature for Class H insulation of BCH motors?
a)
180 deg C
b)
155 deg C
c)
120 deg C
d)
105 deg C
25.
What is the Overload capacity of motors?
a)
70% overload for 15 seconds
b)
60% overload for 15 seconds
c)
60% overload for 10 seconds
d)
80% overload for 15 seconds
Reset
