Element of Electrical Design (3160918) MCQs

MCQs of DESIGN OF STARTERS AND FIELD REGULATORS

Showing 1 to 10 out of 31 Questions
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1.

What is the function of the motor starter?

(a)

To prevent high starting current due to N=0
(b)

It provides overload and under voltage protection (if overload coil used)
(c)

Its provide manual start and stop function 
(d)

All of these 
Answer:

Option (d)

2.

Which of the following is not a function of a motor starter?

(a)

To prevent high starting current due to N=0
(b)

It provides overload and under-voltage protection (if overload coil used)
(c)

It provides high starting torque to the motor 
(d)

It provides a manual start and stops function 
Answer:

Option (c)

3.

Which of the following motors, the starter didn't use to limit high starting current.

(a)

DC Shunt Motor
(b)

DC Series Motor
(c)

Three-phase Induction Motor 
(d)

Synchronous motor 
Answer:

Option (d)

4.

Which of the following is not a DC shunt motor starter?

(a)

Two-Point Starter 
(b)

Three-Point Starter 
(c)

Four-Point Starter 
(d)

None of these 
Answer:

Option (a)

5.

Which of the following is the reason for the high starting current in DC Motor?

(a)

Back EMF is ZERO in starting 
(b)

Rotor EMF is ZERO in Starting 
(c)

No magnetic locking between Stator and rotor field
(d)

pulsating (not rotating) magnetic field 
Answer:

Option (a)

6.

Which of the following statement is not true w.r.t. 3-Point and 4-Point DC shunt motor starter?

(a)

Both can limit high starting current 
(b)

both can provide overload protection 
(c)

both can provide No voltage protection 
(d)

both can be used where speed control is required using the field control method.
Answer:

Option (d)

7.

What is the work of the starter with respect to the mechanical stress?

(a)

to allow large mechanical stress
(b)

to restrict large mechanical stress
(c)

to allow small mechanical stress
(d)

to restrict small mechanical stress
Answer:

Option (b)

8.

What is the relation of the current with the starting torque in the starter concept?

(a)

the starter should restrict current to prevent low starting torque
(b)

the starter should restrict current to produce high starting torque
(c)

the starter should send current to prevent low starting torque
(d)

the starter should send current to produce high starting torque
Answer:

Option (d)

9.

Which of the following machine is not considered in the calculation of the resistance steps?

(a)

DC Series motor starter 
(b)

DC Shunt motor starter 
(c)

3-Phase IM (Cage Rotor)
(d)

3-Phase IM (Slip Ring)
Answer:

Option (c)

10.

What is the concept of notching operation?

(a)

process of decreasing the voltage
(b)

process of increasing the efficiency
(c)

process of cutting out the resistance
(d)

process of adding on the resistance
Answer:

Option (c)

Showing 1 to 10 out of 31 Questions
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