MCQOPTIONS
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MCQOPTIONS
This section includes 991 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
In cyclic loading, stress concentration is more serious in |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Brittle as well as ductile materials |
| D. | Elastic materials |
| Answer» C. Brittle as well as ductile materials | |
| 702. |
In static loading, stress concentration is more serious in |
| A. | Brittle materials |
| B. | Ductile materials |
| C. | Brittle as well as ductile materials |
| D. | Elastic materials |
| Answer» B. Ductile materials | |
| 703. |
In block brakes, the ratio of shoe width to wheel diameter is taken between |
| A. | 0.1 and 0.25 |
| B. | 0.25 and 0.50 |
| C. | 0.50 and 0.75 |
| D. | 0.75 and 1 |
| Answer» C. 0.50 and 0.75 | |
| 704. |
When the fulcrum is in between the load and effort, the lever is said to be of |
| A. | First type |
| B. | Second type |
| C. | Third type |
| D. | Any one of these |
| Answer» B. Second type | |
| 705. |
The sleeve or muff coupling is designed as a |
| A. | Dun cylinder |
| B. | Hollow shaft |
| C. | Solid shaft |
| D. | Thick cylinder |
| Answer» C. Solid shaft | |
| 706. |
A connecting rod is designed as a |
| A. | Long column |
| B. | Short column |
| C. | Strut |
| D. | All of these |
| Answer» D. All of these | |
| 707. |
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as |
| A. | M6 |
| B. | M8 |
| C. | M6 - 8d |
| D. | M8 - 6d |
| Answer» D. M8 - 6d | |
| 708. |
In a gear, having Involute teeth, the normal to the Involute is a tangent to the |
| A. | Base circle |
| B. | Pitch circle |
| C. | Addendum circle |
| D. | Dedendum circle |
| Answer» B. Pitch circle | |
| 709. |
The centre to centre distance between two consecutive rivets in a row, is called |
| A. | Margin |
| B. | Pitch |
| C. | Back pitch |
| D. | Diagonal pitch |
| Answer» C. Back pitch | |
| 710. |
The bending stress in a curved beam is |
| A. | Zero at the centroidal axis |
| B. | Zero at the point other than centroidal axis |
| C. | Maximum at the neutral axis |
| D. | None of these |
| Answer» C. Maximum at the neutral axis | |
| 711. |
The rated life of a bearing varies |
| A. | Directly as load |
| B. | Inversely as square of load |
| C. | Inversely as cube of load |
| D. | Inversely as fourth power of load |
| Answer» D. Inversely as fourth power of load | |
| 712. |
A cotter joint is used to connect two __________ rods. |
| A. | Co-axial |
| B. | Perpendicular |
| C. | Parallel |
| D. | None of these |
| Answer» B. Perpendicular | |
| 713. |
An ohmmeter is a |
| A. | moving iron instrument |
| B. | moving coil instrument |
| C. | dynamometer instrument |
| D. | none of the above |
| Answer» C. dynamometer instrument | |
| 714. |
An ammeter is a |
| A. | secondary instrument |
| B. | absolute instrument |
| C. | recording instrument |
| D. | integrating instrument |
| Answer» B. absolute instrument | |
| 715. |
Hot rolled sheets have ______ value of permeability |
| A. | zero |
| B. | low |
| C. | high |
| D. | none of the above |
| Answer» C. high | |
| 716. |
Most common form of A.C. meters met with in every day domestic and industrial installations are |
| A. | mercury motor meters |
| B. | commutator motor meters |
| C. | induction type single phase energy meters |
| D. | all of the above |
| Answer» D. all of the above | |
| 717. |
The length cf air gap to be provided in ______ is primarily determined by power factor consideration. |
| A. | d.c. series motor |
| B. | d.c. shunt motor |
| C. | induction motor |
| D. | synchronous motor |
| Answer» D. synchronous motor | |
| 718. |
Which of the following is measured by using a vector voltmeter ? |
| A. | Amplifier gain and phase shift |
| B. | Filler transfer functions |
| C. | Complex insersion loss |
| D. | All of the above |
| Answer» E. | |
| 719. |
A voltage of about 200 V can be measured |
| A. | directly by a D.C. potentiometer |
| B. | a D.C. potentiometer in conjunction with a volt ratio box |
| C. | a D.C. potentiometer in conjunction with a known resistance |
| D. | none of the above |
| Answer» C. a D.C. potentiometer in conjunction with a known resistance | |
| 720. |
The design of mechanical parts is particularly important in case of _____ speed machines. |
| A. | low |
| B. | medium |
| C. | high |
| D. | any of the above |
| Answer» D. any of the above | |
| 721. |
The thermal conductivity of hydrogen is ______ times that of air |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 7 |
| Answer» E. | |
| 722. |
Hydrogen has a heat transfer co-efficient _____ times that of air |
| A. | 1.5 |
| B. | 2.5 |
| C. | 3.5 |
| D. | 4.5 |
| Answer» B. 2.5 | |
| 723. |
It is required to measure the true open circuit e.m.f. of a battery. The best device is |
| A. | D.C. voltmeter |
| B. | Ammeter and a known resistance |
| C. | D.'potentiometer |
| D. | None of the above |
| Answer» D. None of the above | |
| 724. |
To avoid the effect of stray magnetic field in A.C. bridges we can use |
| A. | magnetic screening |
| B. | Wagner earthing device |
| C. | wave filters |
| D. | any of the above |
| Answer» B. Wagner earthing device | |
| 725. |
_______ brushes are fragile and cause excessive wear of commutator, |
| A. | Natural graphite |
| B. | Hard carbon |
| C. | Electro graphitic |
| D. | Metal graphite |
| Answer» B. Hard carbon | |
| 726. |
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be |
| A. | almost zero |
| B. | low |
| C. | high |
| D. | none of the above |
| Answer» D. none of the above | |
| 727. |
A current density of _________ is used for large power transformers with forced circulation of oil or with water cooling coils |
| A. | 1.5 to 2.5 A/mm² |
| B. | 3.5 to 4.5 A/mm² |
| C. | 4.0 to 5.0 A/mm² |
| D. | 5.4 to 6.2 A/mm² |
| Answer» E. | |
| 728. |
The density of hydrogen is _____ times the density of air. |
| A. | 0.07 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» B. 1.5 | |
| 729. |
A Weston synchronoscope is a |
| A. | moving coil instrument |
| B. | moving iron instrument |
| C. | dynamometer instrument |
| D. | none of the above |
| Answer» D. none of the above | |
| 730. |
To measure a resistance with the help of a potentiometer it is |
| A. | necessary to standardise the potentiometer |
| B. | not necessary to standardise the potentiometer |
| C. | necessary to use a volt ratio box in conjunction with the potentiometer |
| D. | none of the above |
| Answer» C. necessary to use a volt ratio box in conjunction with the potentiometer | |
| 731. |
Wattmeter cannot be designed on the principle of |
| A. | electrostatic instrument |
| B. | thermocouple instrument |
| C. | moving iron instrument |
| D. | electrodynamic instrument |
| Answer» D. electrodynamic instrument | |
| 732. |
In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be |
| A. | unity |
| B. | 0.5 |
| C. | 0.3 |
| D. | zero |
| Answer» C. 0.3 | |
| 733. |
A practical formula for determining the thickness of insulation between low voltage and high voltage windings is |
| A. | 1 + 0.2 kV mm |
| B. | 2 + 0.5 kV mm |
| C. | 4 + 0.7 kV mm |
| D. | 5 + 0.9 kV mm |
| Answer» E. | |
| 734. |
In a Weston frequency meter, the magnetic axes of the two fixed coils are |
| A. | parallel |
| B. | perpendicular |
| Answer» C. | |
| 735. |
Which of the following methods is used for air cooling of turbo-alternators ? |
| A. | One sided axial ventilation |
| B. | Two sided axial ventilation |
| C. | Multiple inlet system |
| D. | All of the above |
| Answer» E. | |
| 736. |
The efficiency of a machine should be as ______ as possible to reduce the operating cost. |
| A. | high |
| B. | low |
| C. | either of the above |
| D. | none of the above |
| Answer» B. low | |
| 737. |
In D.C. machines the width of the duct is usually |
| A. | 4 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 10 mm |
| Answer» E. | |
| 738. |
Systematic errors are |
| A. | instrumental errors |
| B. | environmental errors |
| C. | observational errors |
| D. | all of the above |
| Answer» E. | |
| 739. |
The power of a n-phase circuit can be measured by using a minimum of |
| A. | (n – 1) wattmeter elements |
| B. | n wattmeter elements |
| C. | (n + 1) wattmeter elements |
| D. | 2n wattmeter elements |
| Answer» B. n wattmeter elements | |
| 740. |
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill. |
| A. | 2 to 3 times greater |
| B. | 3 to 4 times greater |
| C. | 4 to 5 times greater |
| D. | none of the above |
| Answer» B. 3 to 4 times greater | |
| 741. |
In a single phase power factor meter the phase difference between the currents in the two pressure coils is |
| A. | exactly 0° |
| B. | approximately 0° |
| C. | exactly 90° |
| D. | approximately 90° |
| Answer» D. approximately 90° | |
| 742. |
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling |
| A. | 2 MVA |
| B. | 5 MVA |
| C. | 7.5 MVA |
| D. | 10 MVA |
| Answer» E. | |
| 743. |
Helical windings are used in |
| A. | distribution transformers |
| B. | power transformers |
| C. | shell type transformers |
| D. | none of the above |
| Answer» C. shell type transformers | |
| 744. |
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is |
| A. | 10° |
| B. | 80° |
| C. | 120° |
| D. | 170° |
| Answer» B. 80° | |
| 745. |
The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density. |
| A. | air |
| B. | hydrogen |
| C. | either (A) or (B) |
| D. | none of the above |
| Answer» C. either (A) or (B) | |
| 746. |
Which of the following is the commonly used type of electromagnets ? |
| A. | Flat-faced armature type |
| B. | Horse shoe type |
| C. | Flat-faced plunger type |
| D. | All of the above |
| Answer» E. | |
| 747. |
With conventional hydrogen cooling it is possible to increase the rating of a single unit to |
| A. | 50 MW |
| B. | 100 MW |
| C. | 200 MW |
| D. | none of the above |
| Answer» D. none of the above | |
| 748. |
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at |
| A. | 0° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 749. |
The power factor of a single phase load can be calculated if the instruments available are |
| A. | one voltmeter and one ammeter |
| B. | one voltmeter, one ammeter and one wattmeter |
| C. | one voltmeter, one ammeter and one energy meter |
| D. | any of the above |
| Answer» C. one voltmeter, one ammeter and one energy meter | |
| 750. |
In a D.C. machine the current per brush arm should not be more than |
| A. | 100 A |
| B. | 200 A |
| C. | 300 A |
| D. | 400 A |
| Answer» E. | |