UPPCL Questions

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Q1:-In a series a.c. circuit the voltage across a pure capacitor is 12V and the voltage across a pure resistance is 5V. Then the supply voltage will be _________.

13V 
17V 
7V 
2.7V

ANSWER:-13V 

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Q2:-What will be the largest number of 100W electric light bulbs which can be operated from a 200V supply fitted with a 13A fuse?

16 
26 
31 
32 

ANSWER:-26

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Q3:-A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.6mA with shunt resistance of 1 ohm. Current through the meter at 0.5 F.S.D is:-

0.007mA 
0.05mA 
0.3mA 
0.01mA 

ANSWER:-0.3mA

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Q4:-A time–varying flux causes an induced electromotive force". What law does this statement represent?

1.Ampere's law
2.Faraday's law
3.Lenz's law
4.Field form of Ohm's law

ANSWER:-Faraday's law 

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Q5:-In a 3 phase controlled bridge rectifier,each thyristor conducts for the period of maximum of _____________.

60 degree 
180 degree 
120 degree 
90 degree 

ANSWER:-120 degree 

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UPPCL Questions

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Q1:-The maximum power developed by a synchronous motor depends on ________________ & _________________.

1. Supply voltage, Maximum value of load angle  
2. Supply voltage, Excitation current  
3. Excitation current, Maximum value of load angle
4. Output voltage,Supply frequency 

ANSWER:-Supply voltage, Excitation current

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Q2:-The Anode current through a conducting SCR is 12 A. If its gate current is made one-third, then find Anode current.

1.5A 

2.4A 

3.0A 

4.12A 

ANSWER:- 0A 

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Q3:-Assertion (A): It is possible to design a current source using operational amplifier
Reason (R): Operational amplifier is a current controlled voltage source
1.Both A and R are individually true and R is the correct explanation of A
2.Both A and R are individually true but R is not the correct explanation of A
3.A is true but R is false
4.A is false but R is true 

ANSWER:-A is true but R is false 

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Q4:-A 220V, 100W lamp has a working resistance of:-

2.2Ω
480Ω
960Ω
484Ω

ANSWER:-484Ω

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Q5:-Eddy current loss in a transformer is proportional to:-

1.Frequency
2.Supply voltage
3.Square of the frequency
4.Square of the voltage only

ANSWER:-Square of the frequency 

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UPPCL Questions

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Q1:-A moving coil of a meter has 400 turns and a length and depth of 20 mm and 20 mm respectively. It is positioned in a uniform radial flux density of 200 mT. The coil carries a full scale current of 25 mA. The torque on the coil is ____________________ and sensistivity is _____________________ 

1.800 μNm , 40 Ω/V 
2.800 μNm ,25 Ω/V 
3.200 μNm ,100 Ω/V 
4.800 μNm,1 Ω/V 

ANSWER:-1

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Q2:-In a three phase half wave rectifier feeding resistive load, if the input source is a three phase 4 wire system and line to line voltage is 100 V. The supply frequency is 400 Hz. The ripple frequency at the output is:-

1.400 Hz

2.600 Hz

3.1200 Hz

4.800 Hz

ANSWER:-3

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Q3:-The measurement range of an voltmeter can be increased by using a ________.

1.High resistance in shunt 
2.Low resistance in shunt
3.High resistance in series
4.Low resistance in series 

ANSWER:-3

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Q4:-Two single-phase transformers A and B with equal turn ratio have reactances of j3 Ω and j9 Ω referred to secondary. When operated in parallel, the load-sharing of 200 kW at 0.8 pf lag between A and B transformers would respectively be:-

1.75 kW and 25 kW
2.100kW and 100 kW
3.150 kW and 50kW
4.120 kW and 80 kW 

ANSWER:-3

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Q5:-Surge impedance loading of a transmission line can be increased by:-

1. Decreasing its voltage level
2. Reducing the length of the line

Only 2 is correct 
Only 1 is correct 
Both 1 & 2 is correct 
Both 1 & 2 is incorrect 

ANSWER:-Only 2 is correct 

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Electrical questions

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Q1:- armature winding is one in which working
1. Flux is produced by field current
2. Flux is produced by working emf
3. EMF is produced by the working flux
4.-emf is produced by the leakage flux

ANSWER:-3

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Q2:- A pole pitch in electrical machine is

1. Equal to 180 degree electrical

2. Equal to 180 degree mechanical

3. Less than 180 degree electrical

4. Greater than 180 degree electrical

ANSWER:-1

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Q3:- a coil consist of

1. two conductors
2.t wo coil sides 
3. Two turns
4.four turns

ANSWER:-2

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Q4:- one turn consist of

1.two coil sides
2.two conductors
3.four conductors 
4.four coil sides

ANSWER:-2

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Q5:- in AC rotating machine that generated for Speed EMF

1. Is in face with the both working flux
2. Leads flux by 90di
3. Lag flux by 90 degree
4.lags by 180 degree

ANSWER:-3

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Machine question

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Q1:- what is the pressure of the brushes on communicator
1. (0. 9 kg /2.5 cm square )
2.(3600 kg / m square)
3.both
4.none of these

ANSWER:-3

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Q2:-In  DC motor control methods for field control which of the following is true

1.Below basic speed

2. Above Base speed

3.Above base torque

4. Below based on

ANSWER:-2

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Q3:-In  DC motor control methods for armature control which of the following is true

1.Below basic speed
2.Above Base speed
3.Above base torque
4. None of these

ANSWER:-1

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Q4:- in Hopkinson's method of testing DC machines the power taken from the mains has to supply

1. The losses in the motor only
2. The losses in both the Machines
3. The input to both the Machines
4. The input motor and not to the generator

ANSWER:-2

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Q5:- the function of a DC motor starter this to

1. Start the DC motor
2. Limit the starting current
3. Increase the starting torque
4. Avoid dips in the supply voltage

ANSWER:-1

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All in one questions

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Q1:- when temperature increases the carbon resistance will be
1. Increase
2. Decrease
3. Remain same
4. None of these

ANSWER:-2

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Q2:- which powder is used to make a resistance

1. Carbon, graphite

2. Silicon, Germanium

3. Both

4. None of these

ANSWER:-1

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Q3:- on which type of generator gives same voltage on varing the Load

1. Shunt generator
2. Level compound generator
3. Series generator
4. Short shunt compound generator

ANSWER:-2

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Q4:- on which generator The Terminal voltage is zero

1. Series generator
2. Shunt generator
3. Compound generator
4. Separately excited generator

ANSWER:-1

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Q5:- to get high current in DC Generator which of the following binding should be used

1. Lap winding
2. Progressive wave winding
3. Retrogressive wave winding
4. None of these

ANSWER:-2

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Electrical instrumentation

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Q1:- what type of a bridge circuit is used to measure inductance and capacitance
1. Wheatstone Bridge
2. DC Bridge
3. AC Bridge
4. AC and DC Bridge

ANSWER:-3

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Q2:- the pocket type test on sometimes called wiggy is used to indicate approximate

1. Current

2. Resistance

3. Voltage

4. Impedance

ANSWER:-3

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Q3:- pocket type voltage tester will indicate

1. DC voltage only
2. AC voltage only
3. AC or DC voltage
4. Both voltage and resistance

ANSWER:-3

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Q4:- when current transformer or not in use the secondary should be

1. Fused
2. Open circuited
3. Short circuited
4. Ground with  primary

ANSWER:-3

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Q5:- before connecting and Ohmmeter to circuit steps to ensure that

1. The circuit is energized
2. All capacitor discharge
3. All switches are closed
4. All inductor are discharge

ANSWER:-2

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