Element of Electrical Design (3160918) MCQs

MCQs of DESIGN OF STARTERS AND FIELD REGULATORS

Showing 11 to 20 out of 31 Questions
1 2 3 4
11.

What happens in the dc shunt motor when the notching process occurs?

(a)

flux remains constant
(b)

speed remains constant
(c)

voltage remains constant
(d)

current remains constant
Answer:

Option (b)

12.

Why push-button type of automatic starters are used in the industry?

(a)

The motor can be started in the minimum time.
(b)

An inexperienced operator can start and stop the motor without the possibility of blowing fuses.
(c)

same starting characteristics obtained each time 
(d)

All of these
Answer:

Option (d)

13.

Which of the following is a commonly used type of d.c.  automatic starters?

(a)

Only Back  emf  type 
(b)

only Time delay type
(c)

Back  emf  type or Time delay type
(d)

Slip type
Answer:

Option (c)

14.

Which of the following parts are not required in the Automatic DC motor Starter?

(a)

Starting resistance sections
(b)

Overload relay coils (magnetic coils)
(c)

Starting arms & Spring 
(d)

Starting Arms, Spring, Studs & NVC
Answer:

Option (d)

15.

Which of the following statement is/are not correct for automatic DC motor starters.

(a)

Start button, Stop Button, Main operating coil & Overload relay contacts are connected in series.
(b)

Auxiliary (Maintaining) Contact is always connected in parallel with Start Button.
(c)

Overload coil and Main Contact are connected in series.
(d)

Main contact and auxiliary contact are operated according to the Main operating coil and auxiliary operating coil simultaneously.
Answer:

Option (d)

16.

Arrange proper sequence for automatic DC motor starter.

(a) Press Start Button

(b) Main Operating coin energies.

(c) Main and auxiliary contact closed simultaneously.

(d) motor get supply 

(a)

a - b - c - d
(b)

a - d - b - c
(c)

d - a - c - b
(d)

a - b - d - c
Answer:

Option (a)

17.

Which of the following statement is/are not correct for automatic DC motor starters.

(a)

Start button, Main and Auxilary contact is always NO
(b)

Stop Button & Overload Relay contact is always NC
(c)

The overload coil is always connected to the control circuit 
(d)

The overload coil is always connected to the power circuit 
Answer:

Option (c)

18.

What happens when the stop button is pushed?

(a)

its discontinue current through the main operating coil, hence motor get stopped.
(b)

its release Start button, hence motor get stopped.
(c)

overload coil operates, which open main operating coil contact, hence motor gets stopped.
(d)

disconnect the main supply directly 
Answer:

Option (a)

19.

_________________ is the disadvantage and _____________________ is the advantage of back e.m.f starter against time delay automatic DC motor starter.

(a)

need feedback,  accurate control
(b)

need setting, accurate control
(c)

need setting, not accurate control
(d)

need feedback,  not accurate control
Answer:

Option (a)

20.

Identify starter type from the diagram given below.

(a)

Automatic Back EMF DC Shunt Motor Starter 
(b)

Manual Back EMF DC Shunt Motor Starter 
(c)

Automatic Time Delay DC Shunt Motor Starter 
(d)

Automatic Back EMF DC Series Motor Starter 
Answer:

Option (a)

Showing 11 to 20 out of 31 Questions
1 2 3 4