← Inspector of Factories
Past Questions
A Buchholz relay can be installed on -
A)
auto-transformer
B)
air-cooled transformer
C)
welding transformer
D)
oil cooled transformer
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'welding transformer' (Option C).
The condition for maximum efficiency for a D.C. generator is -
A)
eddy current loss = stray loss
B)
hysteresis losses = eddy current losses
C)
copper loss = 0
D)
variable losses = constant losses
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'copper loss = 0' (Option C).
Normally Z matrix is a bus -
A)
Null matrix
B)
Sparse matrix
C)
Full matrix
D)
Unity matrix
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Null matrix' (Option A).
Major share of power produced in India is through -
A)
thermal plants
B)
hydroelectric plants
C)
nuclear plants
D)
diesel plant
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'diesel plant' (Option D).
Which type of winding is used in 3-phase shell-type transformer?
A)
circular type
B)
sandwich type
C)
cylindrical type
D)
rectangular type
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'circular type' (Option A).
Transfer function of a system is used to calculate which of the following?
A)
The order of the system
B)
The time constant
C)
The output for any given input
D)
The steady state gain
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'The output for any given input' (Option C).
If the excitation of the synchronous generators fails, it acts as a -
A)
synchronous motor
B)
synchronous generator
C)
induction motor
D)
induction generator
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'synchronous generator' (Option B).
Brushes of D.C machines are made of -
A)
carbon
B)
soft copper
C)
hard copper
D)
all of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'all of these' (Option D).
A voltage control bus is characterised by the specified -
A)
real and reactive powers
B)
real power and voltage phase angle
C)
real power and voltage magnitude
D)
reactive power and voltage magnitude
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'real power and voltage phase angle' (Option B).
Equal area criteria is applicable for -
A)
single machine system
B)
two-machine system
C)
multi-machine system
D)
any one of the above
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'any one of the above' (Option D).
In lap winding, the number of brushes is always -
A)
double the number of poles
B)
same as the number of poles
C)
half the number of poles
D)
two
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'same as the number of poles' (Option B).
If the applied voltage to a dc machine is 230 V, then the back emf for maximum power delivered is-
A)
115 V
B)
200 V
C)
230 V
D)
460 V
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '230 V' (Option C).
Phase margin of a system is used to specify which of the following?
A)
Frequency response
B)
Absolute stability
C)
Relative stability
D)
Time response
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Time response' (Option D).
The position and velocity errors of a type-2 system are -
A)
Constant, constant
B)
Constant, infinity
C)
Zero, constant
D)
Zero, zero
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Constant, infinity' (Option B).
Natural oil cooling is used for transformer upto a rating of -
A)
3000 kVA
B)
1000 kVA
C)
500 kVA
D)
250 kVA
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '500 kVA' (Option C).
Transformer cores are laminated in order to -
A)
simplify its construction
B)
minimize eddy current loss
C)
reduce cost
D)
reduce hysteresis loss
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'minimize eddy current loss' (Option B).
The fractional slip of an induction motor is the ratio -
A)
rotor Cu loss/rotor input
B)
stator Cu loss/stator input
C)
rotor Cu loss/rotor output
D)
rotor Cu loss/stator Cu loss
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'rotor Cu loss/rotor input' (Option A).
Equal area criteria given the information responding -
A)
stability region
B)
absolute stability
C)
relative stability
D)
swing curves
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'relative stability' (Option C).
In an ideal transformer -
A)
winding have no resistance
B)
core has no losses
C)
core has infinite permeability
D)
all of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'all of these' (Option D).
The insulation of modern EHV lines is designed based on -
A)
the lightning voltage
B)
corona
C)
radio interference
D)
switching voltage
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'corona' (Option B).
The initial response when the output is not equal to input is called -
A)
Transient response
B)
Error response
C)
Dynamic response
D)
All of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'All of these' (Option D).
If a D.C. motor is to be selected for conveyors, which motor would be preferred?
A)
series motor
B)
shunt motor
C)
differentially compound motor
D)
cumulative compound motor
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'series motor' (Option A).
The most common type of unsymmetrical fault is -
A)
single line to ground
B)
double line to ground
C)
line to line
D)
three phase
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'single line to ground' (Option A).
The relay which is most sensitive to power swings is -
A)
Mho relay
B)
Reactance relay
C)
Impedance relay
D)
All are equally affected
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Impedance relay' (Option C).
The polarity of a D.C. generator can be reversed by -
A)
reversing the field current
B)
increasing field current
C)
reversing field current as well as direction of rotation
D)
none of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'increasing field current' (Option B).