Industrial Drives MCQs

Option A: water pumps

Option B: jaw crushers

Option C: centrifugal blowers

Option D: none of the above

Correct Answer: jaw crushers ✔

Option A: 20 to 30 m/s

Option B: 10 to 15 m/s

Option C: 5 to 10 m/s

Option D: 1 to 2.5 m/s

Correct Answer: 1 to 2.5 m/s ✔

Option A: horsepower rating increases but r.p.m. decreases

Option B: horsepower rating decreases but r.p.m. increases

Option C: horsepower rating and operating speed increases

Option D: horsepower rating and operating speed decreases

Correct Answer: horsepower rating increases but r.p.m. decreases ✔

Option A: Type of bearings

Option B: Type of enclosure

Option C: Noise

Option D: Arrangement for power transmis¬sion

Correct Answer: Noise ✔

Option A: A 100 H.P. AC. three phase motor

Option B: Four motors of 25 H.P. each

Option C: Five motors of 20 H.P. each

Option D: Ten motors of 10 H.P. each

Correct Answer: A. A 100 H.P. AC. three phase motor ✔

Option A: Shaded pole motor

Option B: Repulsion motor

Option C: Capacitor start motor

Option D: None of the above

Correct Answer: Repulsion motor ✔

Option A: Unsuitable for heavy duty starting

Option B: Torque varies as armature current

Option C: Torque-armature current is a straight line

Option D: Torque is zero for zero armature current

Correct Answer: Unsuitable for heavy duty starting ✔

Option A: Totally enclosed

Option B: Totally enclosed fan cooled

Option C: Open type

Option D: Semi closed

Correct Answer: Totally enclosed ✔

Option A: r.p.m. only

Option B: Horse power only

Option C: Horse power and r.p.m.

Option D: Horse power, r.p.m. and power factor

Correct Answer: Horse power and r.p.m. ✔

Option A: Tapped field control

Option B: Diverter field control

Option C: Series-parallel control

Option D: Any of the above

Correct Answer: Any of the above ✔

Option A: Oil expeller

Option B: Floor mill

Option C: Lifts and hoists

Option D: Centrifugal pump

Correct Answer: Lifts and hoists ✔

Option A: Starting voltage is reduced

Option B: Starting current is reduced

Option C: Both A. and B.

Option D: None of the above

Correct Answer: C. Both A. and B. ✔

Option A: D.C. motor

Option B: Squirrel cage induction motor

Option C: Wound rotor induction motor

Option D: Synchronous motor

Correct Answer: A. D.C. motor ✔

Option A: Single phase motor

Option B: Synchronous motor

Option C: A.C. slip ring motor

Option D: Ward-Leonard controlled D.C. shunt motor

Correct Answer: C. A.C. slip ring motor ✔

Option A: type of drive

Option B: span

Option C: tonnes

Option D: any of the above

Correct Answer: tonnes ✔

Option A: Squirrel cage induction motor

Option B: Wound rotor induction motor

Option C: Synchronous motor

Option D: D.C. motor

Correct Answer: D. D.C. motor ✔

Option A: Squirel cage induction motor

Option B: Schrage motor

Option C: Synchronous motor

Option D: None of the above

Correct Answer: Synchronous motor ✔

Option A: Lower cost

Option B: Better efficiency

Option C: High power factor

Option D: All of the above

Correct Answer: High power factor ✔

Option A: Synchronous motor

Option B: D.C. differentially compound motor

Option C: Ward-Leonard controlled D.C. shunt motor

Option D: AC. slip ring motor

Correct Answer: D. AC. slip ring motor ✔

Option A: Precise control

Option B: Smooth movement

Option C: Fast speed control

Option D: All of the above

Correct Answer: All of the above ✔

Option A: slop speed operation

Option B: high starting torque

Option C: low windage losses

Option D: all of the above

Correct Answer: high starting torque ✔

Option A: Silicon diodes

Option B: Mercury arc rectifier

Option C: Motor generator set

Option D: Any of the above

Correct Answer: Any of the above ✔

Option A: ore handling plants

Option B: steel plants

Option C: heavy engineering workshops

Option D: all of the above

Correct Answer: all of the above ✔

Option A: slip ring motor

Option B: schrage motor

Option C: induction motor

Option D: repulsion motor

Correct Answer: schrage motor ✔

Option A: Synchronous motor

Option B: Slip ring induction motor

Option C: Pole changing induction motor

Option D: Squirrel cage induction motor

Correct Answer: Synchronous motor ✔

Option A: auto-transformer

Option B: star-delta

Option C: slip ring

Option D: any of the above

Correct Answer: slip ring ✔

Option A: plugging

Option B: mechanical braking

Option C: regenerative braking

Option D: rheostatic braking

Correct Answer: mechanical braking ✔

Option A: Exhaust fan

Option B: Ceiling fan

Option C: Refrigerator

Option D: Water pump

Correct Answer: Ceiling fan ✔

Option A: D.C. shunt motor

Option B: D.C. series motor

Option C: Squirrel cage induction motor

Option D: Slip ring induction motor

Correct Answer: Squirrel cage induction motor ✔

Option A: plugging

Option B: mechanical braking

Option C: regenerative braking

Option D: rheostatic braking

Correct Answer: mechanical braking ✔

Option A: Printing machine

Option B: Punching machine

Option C: Planer

Option D: Lathe

Correct Answer: ✔

Option A: Electric shovels

Option B: Cranes

Option C: Rolling mills

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Pole changing squirrel cage motors

Option B: D.C. motors with Ward-leonard con-trol

Option C: A.C. slip ring motors with variable resistance

Option D: Any of the above

Correct Answer: Any of the above ✔

Option A: d.c. shunt motor

Option B: schrage motor

Option C: synchronous motor

Option D: slip ring induction motor

Correct Answer: slip ring induction motor ✔

Option A: Slip ring induction motor

Option B: Synchronous motor

Option C: D.C. shunt motor

Option D: Schrage motor

Correct Answer: Synchronous motor ✔

Option A: paper mills

Option B: steel mills

Option C: moist atmospheres

Option D: explosive atmospheres

Correct Answer: explosive atmospheres ✔

Option A: Resistance in rotor circuit

Option B: Resistance in stator circuit

Option C: Auto-transformer starting

Option D: Star-delta starting

Correct Answer: Resistance in rotor circuit ✔

Option A: transformers

Option B: cooling ranges

Option C: three phase induction motors

Option D: single phase

Correct Answer: cooling ranges ✔

Option A: heavy

Option B: medium

Option C: normal

Option D: low

Correct Answer: heavy ✔

Option A: Cascade controlled A.C. motor

Option B: Slip ring induction motor

Option C: Three phase shunt wound com-mutator motor

Option D: Any of the above

Correct Answer: Any of the above ✔

Option A: Synchronous motor

Option B: Ship ring induction motor

Option C: Squirrel cage induction motor

Option D: D.C. shunt motor

Correct Answer: D. D.C. shunt motor ✔

Option A: ball or roller

Option B: needle

Option C: bush

Option D: thrust

Correct Answer: ball or roller ✔

Option A: ‘crowd’ motion

Option B: angle of swing

Option C: cubic metres

Option D: travel in metres

Correct Answer: cubic metres ✔

Option A: Star-delta

Option B: Resistance starting

Option C: Auto-transformer

Option D: None of the above

Correct Answer: Star-delta ✔

Option A: Pulley

Option B: Starter

Option C: Foundation pedal

Option D: Bearings

Correct Answer: Starter ✔

Option A: synchronous motors are preferred

Option B: A.C. motors are preferred

Option C: individual drive is preferred

Option D: group drive is preferred

Correct Answer: individual drive is preferred ✔

Option A: D.C. series motor

Option B: D.C. shunt motor

Option C: Squirrel cage induction motor

Option D: Wound rotor induction motor

Correct Answer: B. D.C. shunt motor ✔

Option A: variable torque motor

Option B: low torque variable speed motor

Option C: self starting type synchronous motor

Option D: low noise, slow speed motor

Correct Answer: self starting type synchronous motor ✔

Option A: is provided with slip rings

Option B: requires starting gear

Option C: has high cost

Option D: is compact

Correct Answer: is compact ✔

Option A: Synchronous motor

Option B: Reluctance motor

Option C: Series motor

Option D: Shunt motor

Correct Answer: Reluctance motor ✔

Option A: Induction motor

Option B: Synchronous motor

Option C: Capacitor start single phase motor

Option D: Any of the above

Correct Answer: Induction motor ✔

Option A: Synchronous motor

Option B: Schrage motor

Option C: Induction motor

Option D: Universal motor

Correct Answer: Synchronous motor ✔

Option A: Flux

Option B: Armature current

Option C: Flux and armature current

Option D: Speed

Correct Answer: Speed ✔

Option A: Paper mills

Option B: Grinding mills

Option C: Air-conditioners

Option D: Lifts and hoists

Correct Answer: Lifts and hoists ✔

Option A: Single phase motors

Option B: Squirrel cage induction motors

Option C: Slip ring induction motors

Option D: D.C. motors

Correct Answer: D. D.C. motors ✔

Option A: High efficiency operation

Option B: Reversibility

Option C: Variable speed drive

Option D: High starting torque

Correct Answer: Variable speed drive ✔

Option A: Inner race

Option B: Outer race

Option C: Cage

Option D: Bush

Correct Answer: Bush ✔

Option A: less than running torque

Option B: same as running torque

Option C: slightly more than running torque

Option D: double the running torque

Correct Answer: less than running torque ✔

Option A: Frame

Option B: Rearing

Option C: Stator winding

Option D: Rotor winding

Correct Answer: Rearing ✔

Option A: Starting characteristics

Option B: Operating speed

Option C: Horse power

Option D: Speed control

Correct Answer: Speed control ✔

Option A: Light duty

Option B: Medium duty

Option C: Heavy duty

Option D: All of the above

Correct Answer: Heavy duty ✔

Option A: Starting torque

Option B: Conditions of environment

Option C: Limitation on starting current

Option D: Speed control range and its nature

Correct Answer: All of the above ✔

Option A: variable load

Option B: continuous

Option C: continuous but periodical

Option D: intermittent and variable load

Correct Answer: variable load ✔

Option A: Conveyor motor

Option B: Floor mill motor

Option C: Fan motor

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Running characteristics

Option B: Starting characteristics

Option C: Efficiency

Option D: Braking

Correct Answer: Braking ✔

Option A: Electrical characteristics

Option B: Mechanical characteristics

Option C: Size and rating of motors

Option D: Cost

Correct Answer: All of the above ✔

Option A: Universal motor

Option B: D.C. series motor

Option C: Synchronous motor

Option D: Three-phase induction motor

Correct Answer: Synchronous motor ✔

Option A: Squirrel cage induction motor

Option B: Synchronous motors

Option C: Ward-Leonard controlled D.C. motors

Option D: Any of the above

Correct Answer: C. Ward-Leonard controlled D.C. motors ✔

Option A: 2 kW

Option B: 20 kW

Option C: 50 kW

Option D: 100 kW

Correct Answer: 100 kW ✔

Option A: Power houses

Option B: Pumping stations

Option C: Automobile workshops

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Slow speed motors

Option B: Continuous duty motors

Option C: Short time rated motors

Option D: None of the above

Correct Answer: Short time rated motors ✔