Electrical machine MCQ #13
1) The number of brushes in lap winding are always ______
the number of poles.
(a)
double
(b) same
as
(c) half
(d) none
of the above
2) A generator has 4 poles, 16 coils with two layer of
lap winding. Find the pole pitch.
(a) 32
(b) 16
(c) 8
(d) 4
3) The actual flux distortion depends upon _____, in a DC
machine
(a) clearance
between tips of the adjacent pole shoe
(b) shape
of pole shoe
(c) size
of air gap
(d) all
of the above
4) The dummy coil in a DC machine are useful to
(a) reduce
the cost of the machine
(b)
improve the commutation
(c) increase
the efficiency
(d)
maintain mechanical balance of the armature.
ANSWER: | 1-b | 2-c | 3-d | 4-d |
5) The commutator pitch for simplex lap winding is
(a) +1
(b) -1
(c) +1 or
-1
(d)
average pitch
6) Which type of the DC generator is used as an exciter in
turbo generator?
(a) series
(b) shunt
(c) compound
(d) separately
excited
7) Which of the following DC generator has rising VI
characteristic.
(a)
series
(b) shunt
(c) compound
(d) none
8) Which type of DC generator is used for arc welding
purpose?
(a)
series generator
(b) shunt
generator
(c) cumulatively
compound generator
(d) differentially
compound generator
ANSWER: | 5-c | 6-b | 7-a | 8-d |
9) In a DC motor, the shaft torque is less than armature
torque because of
(a) stray
loss
(b) hysteresis
loss
(c) eddy
current loss
(d) all
of the above
10) Ward Leonard control is basically a _____ control
method.
(a) field
diverter
(b) armature
resistance
(c) armature
voltage
(d) field
11) A motor used in punching machine is usually subjected
to
(a) intermediate
load
(b) part
of full load continuously
(c) no
load
(d) full
load continuously
12) The dynamic breaking is generally used with
(a)
series DC motor
(b) shunt DC motor
(c)
Compound DC motor
(d) all
of the above.
ANSWER: | 9-a | 10-c | 11-a | 12-d |
Electrical machine #12
Electrical machine #7
Electrical machine #6
Electrical machine #5
Electrical machine #4
Electrical machine #3
Electrical machine #2
To download this MCQ as PDF click here,
Electrical machine MCQ PDF #13
Electrical machine #12
Electrical machine #6
Electrical machine #5
Electrical machine #4
Electrical machine #3
Electrical machine #2
To download this MCQ as PDF click here,
Electrical machine MCQ PDF #13
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