Single phase motor mcq
important single phase motor mcq - electrical Multiple Choice Questions :-
important single phase motor mcq - electrical Multiple Choice Questions :-
1 1. At stand still condition the value
of slip is
(a) Zero
(b) One
(c) Infinity
(d) None of the above
Ans – b
2 2. If the terminal voltage of an
induction motor is decreased then current
(a) Increase
(b) Decrease
(c) Remain same
(d) None
Ans--- b
3 3. As compared to DOL starting method
the star delta starting method must have
(a) High starting current
(b) Low starting current
(c) High torque
(d) Better acceleration
Ans ---- b
4 4. Single phase motors are commercially
manufactured up to
(a) 1 HP
(b) 2 HP
(c) 3 HP
(d) 4 HP
Ans --- b
5 5. Which of the single phase motors
will operate at high power factor –
(a) capacitor start motor
(b) shaded pole motor
(c) capacitor run motor
(d) split phase motor
Ans --- c
6 6. motor used for driving the record
player deck ---
(a) hysteresis motor
(b) dc series motor
(c) synchronous motor
(d) dc shunt motor
Ans ------ a
7 7. a motor speed of 5000 rpm is required,which
motor will you select---
(a) Hysteresis motor
(b) Shaded pole motor
(c) Capacitor start motor
(d) Universal motor
Ans ---- d
8 8. universal motor is operated on no
load, its speed is limited by---
(a) windage and friction
(b) armature weight
(c) armature reaction
(d) supply voltage
Ans ---- a
9 9. which motor following generally
used in ceiling fan ----
(a)
permanent capacitor type
(b)
capacitor start and run
type
(c)
capacitor start type
(d)
split phase type
Ans---- a
1 10.
universal motor operates
on ---
(a)
synchronous speed with varying
load
(b) constant
speed and varying load
(c)
approximately constant
speed and load
(d)
constant load and varying
speed
Ans --- c
1 11.
Which of the
following applications make use of a universal motor ---
(a)
Lathe machines
(b)
Floor polishing machine
(c)
Oil expeller
(d)
Portable
tools
Ans --- d
1 12.
In portable
tools the speed of the driven shaft is reduced by ---
(a)
Fluid coupling
(b)
Gearing
(c)
Chain drive
(d)
Belt drive
Ans – b
1 13.
The capacitance of a
small single phase motor will be of the order of ---
(a)
Micro or
pico farads
(b)
Farads
(c)
Few hundred farads
(d)
Kilo farads
Ans --- a
1 14.
Reluctance
motors are
(a)
singly
excited
(b)
doubly
excited
(c)
both (a) and
(b)
(d)
none of the
above
Ans ---a
1 15.
Which motor is generally
used for electric shavers
(a)
Universal
motor
(b)
Shaded pole
motor
(c)
Hysteresis
motor
(d)
Reluctance
motor
Ans – a
1 16.
motor generally used in
toys is –
(a)
Reluctance motor
(b)
Shaded pole
motor
(c)
Hysteresis
motor
(d)
Two value
capacitor motor
Ans ---b
1 17.
Which of the
following is a reversible motor---
(a)
Capacitor
start split phase motor
(b)
Universal
motor
(c)
Both (A) and
(B)
(d)
None
Ans --- c
1 18.
The starting
torque of a single phase induction motor is ----
(a)
Zero
(b)
Low
(c)
High
(d)
Uniform
Ans --- a
1 19.
The rotor
for a hysteresis motor ---
(a)
is made of
chrome steel
(b) has high hysteresis loss
(c)
has high
retentivity
(d) all of the above
Ans --- d
2 20.
What could
be the smallest size of a universal motor ---
(a)
1/10 HP
(b)
1/20 HP
(c)
1/200 HP
(d)
None of the
above
Ans – c
2 21.
The
disadvantage of shaded pole motor is ----
(a)
very little
over load capacity
(b)
low
efficiency
(c)
low starting
torque
(d)
all of the
above
Ans –d
2 22.
Which of the
following applications would need the smallest size of motor ---
(a)
Table fan
(b)
Electric
clock
(c)
Domestic
motor
(d)
Sewing
machine
Ans --- b
2 23.
When a
dc series motor is connected to ac supply, it will ---
(a)
give poor
efficiency
(b)
run on poor
power factor
(c)
spark
excessively
(d)
all of the
above
Ans --- d
2 24.
In a
shaded pole motor, the direction of rotation is from –
(a)
shaded pole
to main pole
(b)
main pole to
shaded pole
(c)
depends on
supply line polarity
(d)
none of the
above
Ans ----b
25.
In a shaded pole motor,
shading coils are used to—
(a)
reduce
friction losses
(b)
produce
rotating magnetic field
(c)
reduce
windage losses
(d)
to
protect against sparking
Ans ----- b
Laser means light detection and ranging. A laser can measures the distance of the surface so accurately. Onsite3D provides the best laser scanning service in Vancouver, BC. They will provide you the best service at the lowest price. Quality laser scanning Vancouver, BC
ReplyDelete