Q1:-Voltage regulation of an alternating may be negative
where
1.
The load pf is lagging
2.
The load pf is leading
3.
It is loaded beyond its full oad capacity
4.
The m/c is run at very low load
ANSWER:-2
Q2:-Power t/f are designed such that max efficiency occurs
at
1.
Half of the full load
2.
Near the full load
3.
1/4th of the full load
4.
3/4th of the full load(75%)
ANSWER:-4
Q3:- The brushes of a dc m/c
should be physically placed on the
1.
Armature in the polar axis
2.
Armature in the interloper axis
3.
Commutation in the polar axis
4.
Commutator in the interpoler axis
ANSWER:-3
Q4:-V curve for isolated 3-pahse
synchronous motor show
1.
The variation of mechanical power with field excitation at constant speed
2.
The variation of armature voltage with field
excitation at constant mechanical power
3.
The variation of armature voltage with
mechanical power
4.
The variation of armature current with field
excitation at constant mechanical power
ANSWER:-4
Q5:-Which of the following is
correct?
1.
Synchronous motor is supplied with dc voltage in
the armature winding
2.
Synchronous motor is supplied with ac voltage in
the field winding
3.
Synchronous
motor is supplied with rectified voltage in the field winding
4.
Synchronous motor is supplied with rectified
voltage in the armature winding
ANSWER:-4
Q6:-During stating of 3-phase I.M.
the m/c may refuse to start at all this phenomena is called
1.
Singe phase
2.
Cogging
3.
Staing
4.
Crawing
ANSWER:-2
Q7:- In arc welding the voltage
required to maintain the arc is in range
1.
200-2501V
2.
1000-1200V
3.
3.2-5V
4.
20-30V
ANSWER:-4
Q8:-Which of the following
equipments has the lowest pf
1.
Fully loaded I.M.
2.
Immersion heater
3.
Incandescent lamp
4.
Arc lamp
ANSWER:-4
Q9:-The mmf produced by interpole
is proportional to
1.
Field current
2.
Armature current
3.
Armature current
4.
i/p field current
ANSWER:-2
Q10:- Lumen is the unit of
1.
candela
2.
amp
3.
fulorcent flux
4.
stater
ANSWER:-3
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