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The capacitors used in single-phase capacitor motors have no polarity marking.

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Answer :

In capacitor start single-phase motors current in the starting winding leads the voltage.

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What are the five types of single phase motors used in the industry?

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Answer :

In a capacitor start single-phase motor, when capacitor is replaced by a resistance motor will continue to run in same direction.

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Description :

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

Answer :

What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF, connected in series? A) 500 μC B) 0.5 μC C) 0.5 C D) None of these

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Answer :

If the capacitor of a single-phase motor is short-circuited the motor will not start.

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Answer :

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to improve power factor.

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Description :

Stepper motors are used in  (1) printers (2) lifts (3) amplifiers (4) oscillators

Answer :

Stepper motors are used in printers 

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53 views 1 answer
Description :

Answer :

Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.

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73 views 1 answer
Description :

Answer :

Series capacitors are used to compensate for line inductive reactance.

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Description :

A relay used for protection of motors against overload is :  (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Answer :

A relay used for protection of motors against overload is : Thermal relay

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Answer :

D.C. shunt motors are used for driving machine tools.

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Answer :

In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

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Description :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

Answer :

Which of the following can be used to measure the capacitance of a capacitor? A) Rheostat B) Schering bridge C) Wheatstone bridge D) None of these

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Description :

Answer :

Commonly used standard capacitor is concentric cylindrical type.

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Description :

Which capacitor is used for high frequency?

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Description :

Why shunt capacitor is used?

Answer :

To improve voltage at receiving end and power factor

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73 views 1 answer
Description :

Why capacitor bank is used?

Answer :

In industrial or factory used E.B Power supply must be maintained above 0.90 power factor is compulsory for avoid EB Penalty. So APFC ( automatic Power factor control ) panel is used to maintained balance the load and PF maintained.

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Answer :

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then Electrolytic capacitor will, in all probability, suffer break down.

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Description :

Why is a capacitor used in a single phase motor and not in three phase motor ?

Answer :

In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.

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138 views 6 answers
Description :

Damper winding is provided in 3 phase synchronous motors to :

Answer :

Damper winding is provided in 3 phase synchronous motors to : provide starting torque and prevent hunting

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Description :

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then (A) the flux is constant (B) the flux first decreases and then increases in the same direction (C) the flux increases and decreases in the opposite direction with the same magnitude (D) current flows through the rotor

Answer :

In a single-phase induction motor when the rotor is stationary and voltage is applied to the stator, then the flux first decreases and then increases in the same direction

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Description :

Answer :

The starting winding of a single-phase motor is placed in stator.

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Description :

Answer :

If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

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Answer :

Most of the fractional horsepower motors have either plain or sleeve bearings.

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Description :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Answer :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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128 views 1 answer
Description :

Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these

Answer :

Which of the following motors is being extensively used in servo applications ? A. AC motor B. Field controlled dc motor C. Armature controlled dc motor D. None of these

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Description :

Answer :

A direct online starter is used for starting motors up to 5 H.P.

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Description :

Why capacitors are used to improve power factor?

Answer :

 Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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134 views 3 answers
Description :

Explain the working of a single phase capacitor start induction motor. 

Answer :

Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc

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Description :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

Answer :

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will not start at all.

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124 views 1 answer
Description :

Slot harmonics are reduced in induction motors by using (A) fractional-pitch windings (B) fractional-slot windings (C) integral-slot windings (D) distributed windings

Answer :

Slot harmonics are reduced in induction motors by using fractional-slot windings

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Description :

Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as (A) One-third of their synchronous speed (B) One-fifth of their synchronous speed (C) One-seventh of their synchronous speed (D) One-ninth of their synchronous speed

Answer :

Generally, Crawling in squirrel cage induction motors is tendency to run stably at speeds as low as One-seventh of their synchronous speed

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Description :

Answer :

In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.

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Description :

Answer :

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

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Description :

Answer :

When two D.C. series motors are connected in parallel, the resultant speed is normal speed.

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Description :

Answer :

In D.C. shunt motors as load is reduced the speed will remain almost constant.

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Description :

Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

Answer :

Which of the following test is usually conducted to determine the efficiency of traction motors ? (A) Field’s test (B) Swinburne’s test (C) Hopkinson’s test (D) Retardation test.

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Description :

Answer :

Differentially compound D.C. motors can find applications requiring low starting torque.

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71 views 1 answer
Description :

Answer :

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.

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97 views 1 answer
Description :

What is the difference between synchronous and asynchronous motors?

Answer :

The motor which rotates at constant speed is called synchronous motor. And that constant speed is called as synchronous speed.  And the motor which does not rotates at constant speed are called asynchronous motor. Asynchronous motor is also called as Induction motor.

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Description :

Capacitors for power factor correction are rated in?

Answer :

Capacitors for power factor correction are rated in kVAR.

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63 views 1 answer
Description :

Answer :

In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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Description :

Do capacitors in parallel have the same voltage?

Answer :

Not same but we will get addition of both values when capacitors are connected in parallel...

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Description :

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

Answer :

In a single-phase induction motor, the operating direction is determined by the Starting circuit

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84 views 1 answer
Description :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is (A) sinusoidal current (B) constant dc current (C) continuous rectangular pulses (D) alternating rectangular pulses

Answer :

In a 230 V, 50 Hz single-phase SCR bridge converter operating at a firing delay angle, α and with large R-L load, the input source current is alternating rectangular pulses

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128 views 1 answer
Description :

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

Answer :

In a single-phase transformer, the magnetizing current is in phase with the flux in the core

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Description :

Answer :

In a shaded pole single-phase motor, the revolving field is produced by the use of shading coils.

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Description :

Capacitors

Answer :

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165 views 2 answers
Description :

State any four types of capacitors.

Answer :

Types of capacitors: i) Air capacitor ii) Paper capacitor iii) Mica capacitor iv) Ceramic capacitor v) Electrolytic capacitor vi) Poly-carbon capacitor

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