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This set of Electrical Drives and Controls EDC Multiple Choice Questions & Answers (MCQs) focuses on Electrical Drives And Controls Set 8
Q1 | The value of slip at which maximum torque occurs
- r2÷x2
- 4r2÷x2
- 2r2÷x2
- r2÷3x2
Q2 | AC voltage controllers convert
- fixed ac to fixed dc
- variable ac to variable dc
- fixed ac to variable ac
- variable ac to fixed ac
Q3 | devices were used for voltage control applications.
- cycloconverters
- vacuum tubes
- tap changing transformer
- induction machine
Q4 | applications.
- power generation
- electric heating
- conveyor belt motion
- power transmission
Q5 | In the principle of phase control
- the load is on for some cycles and off for some cycles
- control is achieved by adjusting the firing angle of the devices
- control is achieved by adjusting the number of on off cycles
- control cannot be achieved
Q6 | consists of
- one scr is parallel with one diode
- one scr is anti parallel with one diode
- two scrs in parallel
- two scrs in anti parallel
Q7 | The below shown controller circuit is a
- half wave controller
- full wave controller
- none of the mentioned
- will depend upon the firing angle
Q8 | The below given controller circuit is a
- half wave controller
- full wave controller
- none of the mentioned
- will depend upon the firing angle
Q9 | circuit
- only the negative cycle can be controlled
- only the positive cycle can be controlled
- both the cycles can be controlled
- none of the mentioned
Q10 | Which motor is preferred for Jaw crushers?
- wrim
- scim
- belt slip ring im
- dc shunt motor
Q11 | A high starting torque is offered by the Belt Conveyors.
- true
- false
Q12 | Which starting method is the worst method in Induction motor?
- direct online starting
- autotransformer starting
- reactance starting
- star-delta starting
Q13 | The capacity of the Crane is expressed in terms of tonnes.
- true
- false
Q14 | 1800 second rated motors are used for
- heavy duty cranes
- light duty cranes
- medium duty cranes
- intermittent duty cranes
Q15 | Calculate the frequency of the rotor side of the IM if the value of slip is 0.34 and the supply frequency is 70 Hz.
- 23.8 hz
- 22.7 hz
- 24.5 hz
- 23.1 hz
Q16 | Calculate the resonant frequency if the values of the capacitor and inductor are 4 F and 4 H.
- .25 rad/sec
- .26 rad/sec
- .28 rad/sec
- .29 rad/sec
Q17 | Calculate the value of the angular acceleration of the Heavy duty crane using the given data: J = 5 kg-m2, load torque = 30 N-m, motor torque = 80 N-m.
- 10 rad/s2
- 20 rad/s2
- 30 rad/s2
- 50 rad/s2
Q18 | The direction of the single-phase IM can be reversed by using which one of the method?
- by interchanging the supply terminals
- by removing the capacitor
- by changing the direction of auxiliary winding current
- by removing the main winding
Q19 | Which motor is preferred for overhead traveling cranes?
- intermittent periodic motor
- continuous duty motor
- slow speed duty motor
- short time rated motor
Q20 | Which test is used to determine the conditions where electric motors are being used?
- thermography
- geography
- seismography
- anthropology
Q21 | What is the range of size of the motor (kW) for efficiency nearly equals to 90%?
- 15-150
- 0-2
- 3-15
- 150-250
Q22 | Calculate the heat loss in the electric motor for time interval 0-5 sec using the following data: Ia=2 A, Ra=.8Ω.
- 16 j-sec
- 14 j-sec
- 12 j-sec
- 10 j-sec
Q23 | 1 Btu/h is equal to
- .641
- .334
- .293
- .417
Q24 | Overloading can be prevented using
- over-current protection
- speed protection
- over frequency protection
- oversize protection
Q25 | Full form of IDMT is
- inverse definite minimum time
- inverter definite minimum time
- inverter definite maximum time
- insert definite minimum time